Annex V Entry 9 16/10/2010

SODIUM SULFITE / AMMONIUM BISULFITE / AMMONIUM SULFITE / POTASSIUM SULFITE / POTASSIUM hydrogen SULFITE / SODIUM BISULFITE / SODIUM METABISULFITE / POTASSIUM METABISULFITE

Q: How do I check if my product formula contains SODIUM SULFITE / AMMONIUM BISULFITE / AMMONIUM SULFITE / POTASSIUM SULFITE / POTASSIUM hydrogen SULFITE / SODIUM BISULFITE / SODIUM METABISULFITE / POTASSIUM METABISULFITE?

Use the INCI Checker tool on CosIng Checker to paste your full ingredient list and scan it against all Annex II–VI entries. The tool highlights any ingredients that match restricted, prohibited or allergen-flagged records.

Inorganic sulphites and hydrogensulphites (5)

SODIUM SULFITE / AMMONIUM BISULFITE / AMMONIUM SULFITE / POTASSIUM SULFITE / POTASSIUM hydrogen SULFITE / SODIUM BISULFITE / SODIUM METABISULFITE / POTASSIUM METABISULFITE appears in Annex V as a positive-list preservative entry for EU cosmetics. Maximum concentration in this record: 0.2% (as free SO2).

Permitted preservative— Annex V, EU Regulation 1223/2009

Max conc.: 0.2% (as free SO2)

Entry: 9

Chemical identity and properties

PubChem 2D chemical structure for CAS 10117-38-1

CAS 10117-38-1PubChem CID 24958

Potassium Sulfite

IUPAC name: dipotassium;sulfite

Molecular formula: K2O3S
Molecular weight: 158.26 g/mol
Exact mass: 157.88422800 Da
Topological polar surface area: 82.4 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 3
Defined stereocentres: 0

Also known as

Dipotassium sulfitePotassium sulphiteSulfurous acid, dipotassium saltPotassium sulfite (K2SO3)UNII-015KZC652ESulfurous acid, potassium saltHSDB 5052015KZC652E

16 more reported names

EINECS 233-321-1DIPOTASSIUM SULPHITEPOTASSIUM SULFITE [MI]INS NO.225POTASSIUM SULFITE [FCC]POTASSIUM SULFITE [HSDB]INS-225EC 233-321-1E-225RefChem:175607POTASSIUM SULFITE [INCI]PotassiumsulfiteSulfurous acid, potassium salt (1:2)Potassium sulfite(IV)KaliumsulfitE225

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID80889532

Evidence from additional scientific databases

NIH PubChem PUG-View

Exact identifier match24958

Attributed physical-property, hazard, environmental and use annotations.

Physical Description: Liquid Source: EPA Chemical Data Reporting (CDR)
Physical Description: Dihydrate: White solid; Slowly oxidized by air to sulfate; [Merck Index] White powder; [MSDSonline] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases

Solubility: White crystals or crystalline powder; sol in about 3.5 parts water; decomposed by diluted acids with evolution of sulfur dioxide; pH about 8 /dihydrate/ Source: Hazardous Substances Data Bank (HSDB)
Solubility: White-yellowish, hexagonal form; insol in ammonia; slightly sol in alcohol /dihydrate/ Source: Hazardous Substances Data Bank (HSDB)

Note: This chemical does not meet GHS hazard criteria for 81.5% (242 of 297) of all reports. Source: European Chemicals Agency (ECHA)
Signal: Warning Source: European Chemicals Agency (ECHA)
GHS Hazard Statements: H315 (16.5%): Causes skin irritation [Warning Skin corrosion/irritation]; H319 (18.2%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335 (16.2%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] Source: European Chemicals Agency (ECHA)
Precautionary Statement Codes: P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
ECHA C&L Notifications Summary: Aggregated GHS information provided per 297 reports by companies from 10 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 242 of 297 reports by companies.; There are 7 notifications provided by 55 of 297 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
Signal: Danger Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
GHS Hazard Statements: H302: Harmful if swallowed [Warning Acute toxicity, oral]; H318: Causes serious eye damage [Danger Serious eye damage/eye irritation] Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
Precautionary Statement Codes: P264, P264+P265, P270, P280, P301+P317, P305+P354+P338, P317, P330, and P501 (click each P-code to see the statement) Source: Hazardous Chemical Information System (HCIS), Safe Work Australia

Cosmetic Ingredient Review Finding(s): Safe in the present practices of use and concentration. Ingredient, concentration, and use information are available in documents discoverable at https://cir-reports.cir-safety.org Source: Cosmetic Ingredient Review (CIR)

Consumer Uses: Etching agent; Soil amendments (fertilizers) Source: EPA Chemical Data Reporting (CDR)

Industry Uses: Reducing agent; Soil amendments (fertilizers) Source: EPA Chemical Data Reporting (CDR)

Cosmetic Ingredient Review Link: CIR ingredient: Potassium Sulfite Source: Cosmetic Ingredient Review (CIR)
Sources/Uses: Used in photography, food and cosmetics (preservative and antioxidant), and drugs (cathartic and diuretic); [HSDB] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Industrial Processes with risk of exposure: Photographic Processing [Category: Other] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Uses: Photography; preservative and antioxidant in foods Source: Hazardous Substances Data Bank (HSDB)
Uses: Medication: cathartic, diuretic Source: Hazardous Substances Data Bank (HSDB)
Uses: COMPONENT OF PHOTOGRAPHIC DEVELOPERS; FOOD ADDITIVE (EG, PRESERVATIVE & ANTIOXIDANT); INGREDIENT IN COSMETICS (EG, HAIR PREPARATIONS) Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status

Source	Result	Checked
EMBL-EBI ChEBI	No exact record	2026-08-31
NIH PubChem PUG-View	Exact match	2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 10192-30-0

CAS 10192-30-0PubChem CID 10441651

Ammonium Bisulfite

Ammonium bisulfite is colorless crystals which are soluble in water. It is noncombustible. It is corrosive to aluminum. It is a strong irritant to skin and mucous membranes. It is toxic by skin absorption. — CAMEO Chemicals

IUPAC name: azanium hydrogen sulfite

Molecular formula: H5NO3S
Molecular weight: 99.11 g/mol
Exact mass: 98.99901420 Da
Topological polar surface area: 80.6 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 0

Also known as

Ammonium hydrogen sulfiteAmmonium acid sulfiteAmmonium monosulfiteMonoammonium sulfiteAmmonium hydrosulfite8MW949D9GESulfurous acid, monoammonium saltAmmonium sulfite, hydrogen

16 more reported names

Ammonium bisulfite (NH4HSO3)RefChem:112138233-469-7azanium;hydrogen sulfiteAmmonium hydrogensulphiteAmmonium Bisulfite - In waterSulfurous acid, ammonium salt (1:1)Ammoniumbisulfitammonium bisulphiteammonium hydrogensulfiteUNII-8MW949D9GEHSDB 486AMMONIUM BISULFITE [MI]AMMONIUM BISULFITE [HSDB]Ammonium bisulfite - 45% In waterEINECS 233-469-7

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID1050462

Evidence from additional scientific databases

NIH PubChem PUG-View

Exact identifier match10441651

Attributed physical-property, hazard, environmental and use annotations.

Boiling Point: Sublimates at 302.0 °F (USCG, 1999) Source: CAMEO Chemicals
Boiling Point: at 101.1kPa: 100 °C Source: ILO-WHO International Chemical Safety Cards (ICSCs)

Color/Form: Colorless crystals Source: Hazardous Substances Data Bank (HSDB)
Color/Form: Colorless to yellow Source: Hazardous Substances Data Bank (HSDB)

Density: 2.03 at 68 °F 1.40 (72% aqueous solution) (USCG, 1999) - Denser than water; will sink Source: CAMEO Chemicals
Density: Sp gr: 2.03 Source: Hazardous Substances Data Bank (HSDB)
Density: Relative density (water = 1): 2.0 Source: ILO-WHO International Chemical Safety Cards (ICSCs)

Melting Point: -10 °C Source: ILO-WHO International Chemical Safety Cards (ICSCs)

Physical Description: Ammonium bisulfite is colorless crystals which are soluble in water. It is noncombustible. It is corrosive to aluminum. It is a strong irritant to skin and mucous membranes. It is toxic by skin absorption. Source: CAMEO Chemicals
Physical Description: Ammonium bisulfite is a solution of yellow crystals. It is a strong irritant to skin and mucous membranes. It is toxic by skin absorption. It may be corrosive to metals. Source: CAMEO Chemicals
Physical Description: Liquid Source: EPA Chemical Data Reporting (CDR)
Physical Description: Colorless to yellow solid; [ICSC] Sold only in solution; [Merck Index] Available as 44% and 68% solution; [MSDSonline] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Physical Description: COLOURLESS-TO-YELLOW LIQUID OR CRYSTALS WITH CHARACTERISTIC ODOUR. Source: ILO-WHO International Chemical Safety Cards (ICSCs)

Solubility: In water: 267 g/100 ml @ 10 °C, 620 G/100 ml @ 60 °C Source: Hazardous Substances Data Bank (HSDB)
Solubility: In water: 71.8 g/100 ml @ 0 deg Source: Hazardous Substances Data Bank (HSDB)
Solubility: Solubility in water, g/100ml at 10 °C: 267 (very good) Source: ILO-WHO International Chemical Safety Cards (ICSCs)

Exposure Routes: The substance can be absorbed into the body by ingestion. Source: ILO-WHO International Chemical Safety Cards (ICSCs)

First Aid: Call a physician.; EYES: Flush with water.; SKIN: Flush exposed area with water. (USCG, 1999) Source: CAMEO Chemicals
First Aid: Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:; Refer to the "General First Aid" section. Specific First Aid: For corrosives, in case of contact, immediately flush skin or eyes with running water for at least 30 minutes. Additional flushing may be required. (ERG, 2024) Source: CAMEO Chemicals

Note: This chemical does not meet GHS hazard criteria for 3.7% (6 of 162) of reports. Source: European Chemicals Agency (ECHA)
Signal: Warning Source: European Chemicals Agency (ECHA)
GHS Hazard Statements: H315 (38.3%): Causes skin irritation [Warning Skin corrosion/irritation]; H319 (94.4%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335 (37.7%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] Source: European Chemicals Agency (ECHA)
Precautionary Statement Codes: P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
ECHA C&L Notifications Summary: Aggregated GHS information provided per 162 reports by companies from 11 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 6 of 162 reports by companies.; There are 10 notifications provided by 156 of 162 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
Signal: Danger Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
GHS Hazard Statements: H302: Harmful if swallowed [Warning Acute toxicity, oral]; H318: Causes serious eye damage [Danger Serious eye damage/eye irritation] Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
Precautionary Statement Codes: P264, P264+P265, P270, P280, P301+P317, P305+P354+P338, P317, P330, and P501 (click each P-code to see the statement) Source: Hazardous Chemical Information System (HCIS), Safe Work Australia

Cosmetic Ingredient Review Finding(s): Safe in the present practices of use and concentration. Ingredient, concentration, and use information are available in documents discoverable at https://cir-reports.cir-safety.org Source: Cosmetic Ingredient Review (CIR)

Consumer Uses: Reducing agent; Soil amendments (fertilizers); Processing aids not otherwise specified Source: EPA Chemical Data Reporting (CDR)

Industry Uses: Soil amendments (fertilizers); Reducing agent; Other; Intermediate; Solids separation (precipitating) agent, not otherwise specified; Processing aids not otherwise specified Source: EPA Chemical Data Reporting (CDR)

Cosmetic Ingredient Review Link: CIR ingredient: Ammonium Bisulfite Source: Cosmetic Ingredient Review (CIR)
Sources/Uses: Used in preservatives, fertilizers, grain treatments, explosives, paper production, and corrosion control in drilling fluids; [HSDB] Also used in photography, food preservation, and the gold industry (cyanide destruction process); [MSDSonline] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Industrial Processes with risk of exposure: Pulp and Paper Processing [Category: Industry]; Using Disinfectants or Biocides [Category: Clean]; Photographic Processing [Category: Other] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Uses: SOURCE OF SULFUR IN FLUID FERTILIZERS. Source: Hazardous Substances Data Bank (HSDB)
Uses: IN LIQ ANTIMICROBIAL TREATMENT FOR STORAGE GRAIN. Source: Hazardous Substances Data Bank (HSDB)
Uses: Manufacture of industrial explosives & blasting agents. Source: Hazardous Substances Data Bank (HSDB)
Uses: Used in sulfite pulping processes. Source: Hazardous Substances Data Bank (HSDB)
Uses: For more Uses (Complete) data for AMMONIUM BISULFITE (6 total), please visit the HSDB record page. Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status

Source	Result	Checked
EMBL-EBI ChEBI	No exact record	2026-08-31
NIH PubChem PUG-View	Exact match	2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 10196-04-0

CAS 10196-04-0PubChem CID 25041

Ammonium Sulfite

Ammonium sulfite is a colorless crystalline solid. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in the manufacture of other chemicals, in medicine, and photography. — CAMEO Chemicals

IUPAC name: diazanium;sulfite

Molecular formula: H8N2O3S
Molecular weight: 116.14 g/mol
Exact mass: 116.02556330 Da
Topological polar surface area: 84.4 Å²
Hydrogen-bond donors: 2
Hydrogen-bond acceptors: 4
Covalent units: 3
Defined stereocentres: 0

Also known as

Diammonium sulfiteAmmonium sulphiteDiammonium sulfonate8LF589Y5GDSulfurous acid, diammonium saltSulfurous acid, ammonium saltRefChem:112210233-484-9

13 more reported names

ammoniumsulfiteAmmoniumsulfitdiazanium;suliteAmmonium sulfonateUNII-8LF589Y5GDAMMONIUM SULFITE [MI]AMMONIUM SULFITE [HSDB]HSDB 1426CHEBI:186946EINECS 233-484-9Sulfurous acid ammonium salt (1:2)Sulfurous acid, ammonium salt (1:2)EC 233-484-9

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:186946
EPA DTXSID:DTXSID2064991

Evidence from additional scientific databases

EMBL-EBI ChEBI

Exact identifier matchCHEBI:186946

Diammonium sulfite

Formula: 2H4N.O3S
Average mass: 116.142 g/mol
Monoisotopic mass: 116.02556 Da
Formal charge: 0

p-block molecular entity — is a (CHEBI:33675)
sulfite salt — is a (CHEBI:48857)

p-block molecular entity — is a (CHEBI:33675)
sulfite salt — is a (CHEBI:48857)

Additional curated names

diazanium;sulite

Cross-references from this source

CAS: 10196-04-0 — ChemIDplus
MANUAL_X_REF: 23404 — ChemSpider

Mapped by: Exact CAS cross-reference in the ChEBI compound record. Retrieved: 2026-08-31. Open source record

NIH PubChem PUG-View

Exact identifier match25041

Attributed physical-property, hazard, environmental and use annotations.

Color/Form: White, solid Source: Hazardous Substances Data Bank (HSDB)

Density: greater than 1.1 at 68 °F (USCG, 1999) Source: CAMEO Chemicals
Density: 1.41 @25 °C Source: PAC Chemical Database, U.S. Department of Energy

Odor: Odorless Source: Hazardous Substances Data Bank (HSDB)

Physical Description: Ammonium sulfite is a colorless crystalline solid. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in the manufacture of other chemicals, in medicine, and photography. Source: CAMEO Chemicals
Physical Description: Large Crystals; Dry Powder; Liquid Source: EPA Chemical Data Reporting (CDR)
Physical Description: White odorless solid; [HSDB] White odorless crystalline solid; [MSDSonline] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases

Solubility: Soluble in water, almost insoluble in alcohol, acetone. Source: Hazardous Substances Data Bank (HSDB)

pH: Its aq soln is alkaline to litmus. /ammonium sulfate monohydrate/ Source: Hazardous Substances Data Bank (HSDB)

First Aid: INHALATION: move to fresh air.; INGESTION: give large amount of water; get medical attention.; EYES: flush with water for 15 min.; SKIN: flush with water. (USCG, 1999) Source: CAMEO Chemicals

Note: This chemical does not meet GHS hazard criteria for 71.1% (133 of 187) of all reports. Source: European Chemicals Agency (ECHA)
Signal: Danger Source: European Chemicals Agency (ECHA)
GHS Hazard Statements: H314 (13.4%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H315 (15%): Causes skin irritation [Warning Skin corrosion/irritation]; H319 (15.5%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335 (10.2%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] Source: European Chemicals Agency (ECHA)
Precautionary Statement Codes: P260, P261, P264, P264+P265, P271, P280, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P351+P338, P305+P354+P338, P316, P319, P321, P332+P317, P337+P317, P362+P364, P363, P403+P233, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
ECHA C&L Notifications Summary: Aggregated GHS information provided per 187 reports by companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 133 of 187 reports by companies.; There are 5 notifications provided by 54 of 187 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
Signal: Danger Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
GHS Hazard Statements: H302: Harmful if swallowed [Warning Acute toxicity, oral]; H318: Causes serious eye damage [Danger Serious eye damage/eye irritation] Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
Precautionary Statement Codes: P264, P264+P265, P270, P280, P301+P317, P305+P354+P338, P317, P330, and P501 (click each P-code to see the statement) Source: Hazardous Chemical Information System (HCIS), Safe Work Australia

Cosmetic Ingredient Review Finding(s): Safe in the present practices of use and concentration. Ingredient, concentration, and use information are available in documents discoverable at https://cir-reports.cir-safety.org Source: Cosmetic Ingredient Review (CIR)

Consumer Uses: Soil amendments (fertilizers); Reducing agent; Processing aids not otherwise specified Source: EPA Chemical Data Reporting (CDR)

Industry Uses: Intermediate; Soil amendments (fertilizers); Reducing agent; Preservative; Processing aids not otherwise specified Source: EPA Chemical Data Reporting (CDR)

Cosmetic Ingredient Review Link: CIR ingredient: Ammonium Sulfite Source: Cosmetic Ingredient Review (CIR)
Sources/Uses: Used in photography and in the production of caramel, refractory bricks, lubricants, medicines, permanent wave solutions, ammonium thiosulfite, and ammonium chloride; [HSDB] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Industrial Processes with risk of exposure: Photographic Processing [Category: Other]; Dressing Hair [Category: Other] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Uses: IN PRODN OF CARAMEL. Source: Hazardous Substances Data Bank (HSDB)
Uses: In photography; as reducing agent; in bricks for blast furnace linings; in lubricants for metal cold-working. Source: Hazardous Substances Data Bank (HSDB)
Uses: ... Medicine, permanent wave solns. /Ammonium sulfite monohydrate/ Source: Hazardous Substances Data Bank (HSDB)
Uses: Used in production of ammonium thiosulfite. Source: Hazardous Substances Data Bank (HSDB)
Uses: For more Uses (Complete) data for AMMONIUM SULFITE (6 total), please visit the HSDB record page. Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status

Source	Result	Checked
EMBL-EBI ChEBI	Exact match	2026-08-31
NIH PubChem PUG-View	Exact match	2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 16731-55-8

CAS 16731-55-8PubChem CID 28019

Potassium Metabisulfite

Potassium metabisulfite appears as a white granular or powdery solid with a sharp odor of sulfur dioxide. Decomposes at 150 to 190 °C. Density 2.3 g / cm3. Contact severely irritates skin, eyes, and mucous membranes. Low toxicity. Used as a food preservative and an antioxidant. — CAMEO Chemicals

Molecular formula: K2O5S2
Molecular weight: 222.33 g/mol
Exact mass: 221.8461284 Da
Topological polar surface area: 125.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 6
Covalent units: 3
Defined stereocentres: 0

Also known as

Potassium disulfiteDipotassium pyrosulfiteDipotassium disulfiteSobisuDipotassium metabisulfitepotassium metabisulphitePotassium disulfite (K2S2O5)Potassium pentaoxodisulfate

16 more reported names

Pyrosulfurous acid, dipotassium saltIns-224Potassium metabisulfite (e 224)65OE787Q7WE-224RefChem:867887240-795-3Potassium pyrosulfitePotassium metabisulfite [NF]Potassium metabisulfite (NF)Dipotassium disulphiteCCRIS 1427HSDB 5062EINECS 240-795-3KaliumpyrosulfitUNII-65OE787Q7W

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEMBL:CHEMBL2106901
EPA DTXSID:DTXSID1021293

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 7631-90-5

CAS 7631-90-5PubChem CID 23665763

Sodium Bisulfite

Sodium hydrogensulfite is an inorganic sodium salt having hydrogensulfite as the counterion. It has a role as a mutagen, an allergen, a reducing agent, a food antioxidant and a food colour retention agent. It is an inorganic sodium salt and a sulfite salt. It contains a hydrogensulfite. — ChEBI

IUPAC name: sodium hydrogen sulfite

Molecular formula: HNaO3S
Molecular weight: 104.06 g/mol
Exact mass: 103.95440935 Da
Topological polar surface area: 79.6 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 0

Also known as

sodium hydrogensulfiteSodium bisulphiteMonosodium sulfiteSulfurous acid, monosodium saltSodium sulhydrateUantax SBSHydrogen sodium sulfiteHydrogen sulfite sodium

16 more reported names

Monosodic sulphiteSodium hydrosulfite(DOT)Bisulfite de sodiumSodium bisulfite (1:1)Sodium sulfite (NaHSO3)Sodium bisulfite (NaHSO3)Fr-62Sulfurous acid, sodium salt (1:1)INS NO.222TZX5469Z6ICHEBI:26709INS-222NSC-60680E-222Sodium acid bisulfiteMonosodium salt of sulfurous acid

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:26709
ChEMBL:CHEMBL1689285
EPA DTXSID:DTXSID8034902
PubMed:26980303
PubMed:25086357
PubMed:23220588
PubMed:21873648
PubMed:12519749
PubMed:7578186
PubMed:6703372
PubMed:1484721
PubMed:1482805

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 7681-57-4

CAS 7681-57-4PubChem CID 656671

Sodium Pyrosulfite

Sodium disulfite is an inorganic sodium salt composed of sodium and disulfite ions in a 2:1 ratio. It has a role as a food antioxidant. It contains a disulfite. — ChEBI

Molecular formula: Na2O5S2
Molecular weight: 190.11 g/mol
Exact mass: 189.89825401 Da
Topological polar surface area: 125.0 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 6
Covalent units: 3
Defined stereocentres: 0

Also known as

Sodium metabisulfiteSodium disulfiteDisodium pyrosulfiteNatrii disulfisCampden TabletsDisodium metabisulfiteNatrium pyrosulfitNatriummetabisulfit

16 more reported names

sodium pyrosulphiteSodium bisulfite anhydrousNatrium metabisulfurosumSodium pyrosulfite (Na2S2O5)Disodium pentaoxodisulfate4VON5FNS3CINS NO.223Sodium metabisulfite (e 223)INS-223NSC-158277NSC-227243DISODIUM PYROSULPHITEE-223CHEBI:114786Na(2)S(2)O(5)RefChem:6239

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:114786
ChEMBL:CHEMBL2016976
EPA DTXSID:DTXSID0029684
PubMed:40706911
PubMed:35067933
PubMed:33957602
PubMed:33817499
PubMed:29188487
PubMed:26795242
PubMed:26015265
PubMed:25486021
PubMed:25463229
PubMed:14763933

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 7757-83-7

CAS 7757-83-7PubChem CID 24437

Sodium Sulfite

Sodium sulfite is an inorganic sodium salt having sulfite as the counterion. It has a role as a reducing agent and a food preservative. It is an inorganic sodium salt and a sulfite salt. It contains a sulfite. — ChEBI

IUPAC name: disodium;sulfite

Molecular formula: Na2O3S
Molecular weight: 126.05 g/mol
Exact mass: 125.93635360 Da
Topological polar surface area: 82.4 Å²
Hydrogen-bond donors: 0
Hydrogen-bond acceptors: 4
Covalent units: 3
Defined stereocentres: 0

Also known as

Disodium sulfiteSodium sulfite anhydrousSodium sulphiteSulfurous acid, disodium saltNatrium sulfurosumSulftechNatriumsulfidNatriumsulfit

16 more reported names

S-WATNatrii sulphisAnhydrous sodium sulfiteSodium sulfite (Na2SO3)Exsiccated sodium sulfiteNatrum sulphurosumSodium sulphite anhydrousSulfurous acid, sodium salt (1:2)Sodium sulfite, anhydrousSodium sulfite, exsiccatedDried sodium sulfiteDisodium sulfite (Na2SO3)Anhydrous sodium sulphiteSodium sulfite (2:1)VTK01UQK3GINS NO.221

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

ChEBI:CHEBI:86477
ChEMBL:CHEMBL1945334
EPA DTXSID:DTXSID2044260
PubMed:23973939
PubMed:21873648
PubMed:20348042

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

PubChem 2D chemical structure for CAS 7773-03-7

CAS 7773-03-7PubChem CID 23663620

Potassium Bisulfite

Potassium bisulfite solution is a colorless aqueous with a slight sulfur dioxide odor. Used as a reducing agent and chemical preservative. — CAMEO Chemicals

IUPAC name: potassium hydrogen sulfite

Molecular formula: HKO3S
Molecular weight: 120.17 g/mol
Exact mass: 119.92834655 Da
Topological polar surface area: 79.6 Å²
Hydrogen-bond donors: 1
Hydrogen-bond acceptors: 4
Covalent units: 2
Defined stereocentres: 0

Also known as

Monopotassium sulfiteQJK5LO891PSulfurous acid, potassium salt (1:1)POTASSIUM BISULPHITEUNII-QJK5LO891PPotassium sulfite, hydrogenINS NO.228POTASSIUM BISULFITE [II]

16 more reported names

HSDB 1263INS-228POTASSIUM BISULFITE [HSDB]Sulfurous acid, monopotassium saltPOTASSIUM BISULFITE [MART.]EINECS 231-870-1E-228POTASSIUM BISULFITE (II)POTASSIUM BISULFITE (MART.)RefChem:175431POTASSIUM BISULFITE SOLUTIONPOTASSIUM BISULPHITE SOLUTIONUN2693231-870-1potassium;hydrogen sulfitePotassium hydrogen sulphite

Open full PubChem record PubChem annotations 3D structure image

External database identifiers

EPA DTXSID:DTXSID6064795

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Record details

Maximum concentration

0.2% (as free SO2)

INCI glossary name

SODIUM SULFITE / AMMONIUM BISULFITE / AMMONIUM SULFITE / POTASSIUM SULFITE / POTASSIUM hydrogen SULFITE / SODIUM BISULFITE / SODIUM METABISULFITE / POTASSIUM METABISULFITE

Chemical name

Inorganic sulphites and hydrogensulphites (5)

Regulatory information

Regulation

(EC) 2009/1223

See every entry this act set

SCCS opinions

Opinion concerning Restrictions on Materials listed in annex VI of Directive 76/768/EEC on Cosmetic Products

Identified ingredients

Key data

CAS

7757-83-7 / 10192-30-0 / 10196-04-0 / 10117-38-1 / 7773-03-7 / 7631-90-5 / 7681-57-4 / 16731-55-8

231-821-4 / 233-469-7 / 233-484-9 / 233-321-1 / 231-870-1 /231-548-0 / 231-673-0 / 240-795-3

Annex

Entry number

Inventory links for SODIUM SULFITE / AMMONIUM BISULFITE / AMMONIUM SULFITE / POTASSIUM SULFITE / POTASSIUM hydrogen SULFITE / SODIUM BISULFITE / SODIUM METABISULFITE / POTASSIUM METABISULFITE

Inventory Restriction reference

Ref 31847

AMMONIUM BISULFITE

CAS: 10192-30-0

EC: 233-469-7

Inventory Restriction reference

Ref 31900

AMMONIUM SULFITE

CAS: 10196-04-0

EC: 233-484-9

Inventory Restriction reference

Ref 36994

POTASSIUM METABISULFITE

CAS: 16731-55-8 / 4429-42-9

EC: 240-795-3 / -

Inventory Restriction reference

Ref 37031

POTASSIUM SULFITE

CAS: 10117-38-1 / 23873-77-0

EC: 233-321-1 / -

Inventory Restriction reference

Ref 37740

SODIUM BISULFITE

CAS: 7631-90-5

EC: 231-548-0

Inventory Restriction reference

Ref 37956

SODIUM METABISULFITE

CAS: 7681-57-4 / 7757-74-6

EC: 231-673-0 / -

Inventory Restriction reference

Ref 38095

SODIUM SULFITE

CAS: 7757-83-7

EC: 231-821-4

Direct matches are limited for this record, so nearby entries from Annex V are shown as well.

Annex V 7