Sodium hydrogen sulfite
Sodium bisulfite
CAS: 7631-90-5
Molecular Formula: HNaO3S
Sodium hydrogen sulfite - Names and Identifiers
| Name | Sodium bisulfite |
| Synonyms | Sodium bisulfite SODIUM BISULFITE SODIUM DISULFITE Sodium Bisulphite SODIUM BISULPHITE SODIUM ACID SULFITE SODIUM METABISULPHITE SODIUM HYDROGEN SULFITE Sodium hydrogen sulfite sodium hydrogen sulfate SODIUM HYDROGEN SULPHITE SULFUROUS ACID MONOSODIUM SALT |
| CAS | 7631-90-5 |
| EINECS | 231-548-0 |
| InChI | InChI=1/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-2 |
| InChIKey | DWAQJAXMDSEUJJ-UHFFFAOYSA-M |
Sodium hydrogen sulfite - Physico-chemical Properties
| Molecular Formula | HNaO3S |
| Molar Mass | 104.06 |
| Density | 1.48 |
| Melting Point | 150 °C |
| Water Solubility | 300 g/L |
| Solubility | 300 g/L |
| Appearance | Powder/Solid |
| Specific Gravity | 1.48 |
| Color | White |
| Odor | Slight odor of sulfur dioxide |
| Merck | 13,8660 |
| Storage Condition | Store at RT. |
| Stability | Stable. Incompatible with strong oxidizing agents, strong acids. |
| Physical and Chemical Properties | Trait: white monoclinic crystal. Sulfur dioxide odor. The relative density of 1.48g/cm3 soluble in water, slightly soluble in alcohol. |
| Use | Used as reducing agent, food preservative and bleaching agent |
Sodium hydrogen sulfite - Risk and Safety
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R22 - Harmful if swallowed R31 - Contact with acids liberates toxic gas R41 - Risk of serious damage to eyes R52 - Harmful to aquatic organisms |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S39 - Wear eye / face protection. S46 - If swallowed, seek medical advice immediately and show this container or label. S25 - Avoid contact with eyes. |
| UN IDs | UN 2693 |
| WGK Germany | 1 |
| RTECS | UX8225000 |
| HS Code | 28321000 |
| Packing Group | III |
| Toxicity | LD50 i.v. in rats: 115 mg/kg (Hoppe, Goble) |
Sodium hydrogen sulfite - Upstream Downstream Industry
Sodium hydrogen sulfite - Nature
Open Data Verified Data
A white or yellowish monoclinic crystal or powder with the odour of sulfur dioxide. The relative density was 1. 48. In the air, it is easy to oxidize and release sulfur dioxide to form sulfate, which is soluble in water.
Last Update：2024-01-02 23:10:35
Sodium hydrogen sulfite - Preparation Method
Open Data Verified Data
sodium bisulfite is produced by absorbing sulfur dioxide in the tail gas of acid production with soda ash solution, and then it is centrifuged and air-dried at 250-300 ° C. To obtain sodium bisulfite.
Last Update：2022-01-01 08:53:30
Sodium hydrogen sulfite - Standard
Authoritative Data Verified Data
This product is a mixture of sodium bisulfite and sodium metabisulfite. Calculated as sulfur dioxide (S(O2), should be 61. 5% ~ 67.4%.
Last Update：2024-01-02 23:10:35
Sodium hydrogen sulfite - Trait
Authoritative Data Verified Data
- This product is white particles or crystalline powder; There is a slight odor of sulfur dioxide.
- This product is soluble in water, almost insoluble in ethanol or ether.
Last Update：2022-01-01 11:22:00
Sodium hydrogen sulfite - Use
Open Data Verified Data
used as an oxygen scavenger in oil field water injection treatment system, it is a chemical oxygen scavenger and dechlorination agent that can be used as low pressure boiler water supply. At present, sodium bisulfite is used as a chemical oxygen scavenger in medium and low pressure boilers.
Last Update：2022-01-01 08:53:30
Sodium hydrogen sulfite - Differential diagnosis
Authoritative Data Verified Data
- the aqueous solution (1 - 20) of this product is acidic and shows the identification reaction of bisulfite (General rule 0301).
- identification reaction of sodium salt in aqueous solution of this product (General rule 0301).
Last Update：2022-01-01 11:22:01
Sodium hydrogen sulfite - Safety
Open Data Verified Data
is a low toxic compound, and the oral LD50 of rats is 115g/kg. The concentrated solution has a stimulating effect on the skin and mucous membranes. After contact with the skin and eyes, it should be washed with water. After a lot of food, should be a lot of water to wash the stomach. The operator should wear the specified protective gear. Ventilation should be provided in the work area. Storage and transportation should be protected from sun, rain and moisture. Do not mix with oxidant and strong acid.
Last Update：2022-01-01 08:53:31
Sodium hydrogen sulfite - Exam
Authoritative Data Verified Data
clarity and color of solution
This product l.O g, add water 10ml to dissolve, check according to law (General rule 0901 and General Rule 0 902), the solution should be clear and colorless.
thiosulfate
take l.O g of this product, add water 15mr to dissolve, add 5ml of dilute hydrochloric acid, shake, stand for 5 minutes, and do not produce turbidity.
Iron Salt
take this product l .O g, add hydrochloric acid 2 m l, dry on water bath, add appropriate amount of water to dissolve, check according to law (General Rule 0 8 0 7 ) , compare with the control solution made of 2.0ml standard iron solution, not deeper (0.002%).
Heavy metals
take this product l.O g, add 10ml of water to dissolve, add 5ml of hydrochloric acid, dry on a water bath, add 10ml of water to dissolve, add 1 drop of phenolphthalein indicator solution, add appropriate amount of ammonia test solution to make the solution pink, add acetate buffer (pH 3.5)
2ml and water to 2 5 m l, inspection according to law (General Principles 0821 The first law), containing heavy metals shall not exceed 20 parts per million.
arsenic salt
take 0.5g of this product, add 10ml of water to dissolve, add lm l of sulfuric acid, put it in a sand bath and steam it until white smoke comes out, let it cool, add 21ml of water and 5ml of hydrochloric acid, inspection according to law (General Principles 0822 second law), shall comply with the provisions (0.0004%).
Last Update：2022-01-01 11:22:02
Sodium hydrogen sulfite - Content determination
Authoritative Data Verified Data
take this product about 0. 15g, precision weighing, precision Iodine titration solution (0. 0 5m o I/L )5 0M l, plug, shake to dissolve, place in the dark for 5 minutes, use sodium thiosulfate titration solution (0. lm o l/L) titration, near the end point, add starch indicator liquid lm l, continue titration until the blue disappeared, and the titration results are corrected by blank test. Each l of iodine titrant (0.05mol/L) corresponds to 3. 203mg of SO2.
Last Update：2022-01-01 11:22:02
Sodium hydrogen sulfite - Category
Authoritative Data Verified Data
pharmaceutical excipients, antioxidants.
Last Update：2022-01-01 11:22:02
Sodium hydrogen sulfite - Storage
Authoritative Data Verified Data
light shielding, sealed storage.
Last Update：2022-01-01 11:22:02
Sodium hydrogen sulfite - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Chemical reaction | sodium bisulfite reacts with chlorine or iodine to generate sodium bisulfate or sodium sulfate, hydrogen halide acid or halide can be generated at the same time. (1) NaHSO3 Cl2 H2O = NaHSO4 2HCl(2) NaHSO3 I2 H2O = NaHSO4 2HI sodium bisulfite interacts with zinc to generate sodium dithionite and the like. (1) 4 NaHSO3 (concentrated) Zn = Na2S2O4 Na2SO3 ZnSO3 2H2O(2) 2NaHSO3 Zn H2SO3 = Na2S2O4 ZnSO3 2H2O(3) 2NaHSO3 Zn SO2 = na2sznso4 SO3 H2O reacts with sodium hydrogen sulfite, can produce the corresponding acid sodium salt, at the same time can release sulfur dioxide gas. (1) NaHSO3 H2SO4 = Na2SO4 2SO2 2H2O(2) NaHSO3 HCl = NaCl SO2 2H2O sodium bisulfite interacts with the following bases, salts or organic compounds to generate different products. (1) NaHSO3 NaOH=Na2SO3 H2O(2) 2NaHSO3 NaNO2=Na2HNS2O7 NaOH(3) 5NaHSO3 2KIO3 2H2SO4=5NaHSO4 2KHSO4 I2 H2O |
| identification test | Both sodium salt test (IT-28) and sulfite test (IT-30) were positive. |
| assay | in a flask with a stopper? Accurately move into the 0.1mol/L iodine solution 50ml, add the accurate weighing sample of about 200mg, tight. After 5min, 1ml of hydrochloric acid was added, and starch test solution (TS-235) was added as an indicator. The excess iodine was titrated with 0.1mol/L sodium thiosulfate. Each mI,0.1mol/L iodine equivalent to sulfur dioxide (SO2)3.203mg. |
| toxicity | ADI0 ~ 0.7mg/kg(SO2; Including SO2 and sulfite; FAO/WHO,2001). Ld50115 mg/k (rat, oral). GRAS(FDA,§ 182.3739,2000). |
| usage limit | GB 2760-2001(g/kg): preserved fruit, dried fruit, dried vegetables, fans, glucose, sugar, ICE sugar, sugar, candy, liquid glucose, bamboo shoots, mushrooms and canned mushrooms, 0.45; Potato starch 0.20 (residues ≤ 0.03); Fresh grapes (tablet gasification method, based on sulfite) 2.4 (the residual amount is less than or equal to 0.05 based on SO2, and the outer package of the tablet is not allowed to eat) FAO/WHO(1984): quick-frozen shrimp, prawn and lobster (raw products) 100mg/kg, (cooked products) 30mg/kg (SO2); Frozen French fried potatoes 50mg/kg (SO2); Pineapple juice 500mg/kg (SO2, only for manufacturing). Maximum Residue (based on SO2) specified in Japan: dried apricot and dried peach 2g/kg; Gelatin 0.5g/kg; Molasses and starch syrup 0.3g/kg; Fruit wine 0.35g/kg; shrimp 0.1mg/kg. When applied to dried fruits, a 0.2% ~ 3% solution can be prepared and impregnated or sprayed. FDA,§ 182.3739(2000): not used in meat, B vitamins, source foods, etc. EEC(1990): mainly used for the preservation of alcoholic beverages. |
| Use | sodium bisulfite can be used for bleaching of cotton fabrics and organic matter, in dyes, paper, leather, chemical synthesis and other industries used as reducing agent, the pharmaceutical industry for the production of analgin and aminopyrine intermediates, food-grade products used as bleaching agents, preservatives, antioxidants. sodium bisulfite is a reductive bleaching agent permitted in China. It has a bleaching effect on food and a strong inhibitory effect on the oxidase in plant food. China's provisions can be used for preserved fruit, glucose, sugar, ice sugar, sugar, candy, liquid glucose, dried fruit, dried vegetables, fans, bamboo shoots, mushrooms and canned mushrooms, the maximum use of 0.45g/kg; can also be used for potato starch, the maximum use of 0.2g/kg, potato starch residues (SO2) less than 0.03g/kg. |
| production method | sodium bisulfite mother liquor (containing NaHSO3 40%, PH 3~4) is slowly added with soda ash, generate sodium sulfite solution (to the slurry pH value of 7~8 as the end point); This sodium sulfite solution in series reactor (2~3) the SO2 gas (10% ~ 13%) prepared by sulfur combustion is absorbed, and the reaction generates sodium bisulfite (the end point is the reaction temperature no longer rising), and a large amount of crystals are precipitated during the reaction, the centrifugal separation of moisture containing 6%~ 10% of the wet product, and then by 250~300 deg C air drying dehydration products. 2NaHSO3 + Na2CO3 → 2Na2SO3 + H2O + CO2 + NaSO3 + H2O → 2NaHSO3 The sulfur dioxide in the tail gas of sulfuric acid production was absorbed by soda ash solution to generate sodium bisulfite, which was separated by centrifugation, the sodium bisulfite was prepared by air stream drying at 250-300 °c. Na2CO3 +2SO2 + H2O → 2NaHSO3 + CO2 |
| category | corrosive article |
| toxicity grade | poisoning |
| Acute toxicity | oral-rat LD50: 2000 mg/kg; Abdominal injection-mouse LD50: 675 mg/kg |
| flammability hazard characteristics | thermal decomposition of toxic sulfur dioxide; The aqueous solution is alkaline and corrosive |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | large amount of water |
| Occupational Standard | TWA 5 mg/m3; TWA 5 mg/m3 |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-09-04 09:28:22
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View History
Raw Materials for Sodium hydrogen sulfite
Downstream Products for Sodium hydrogen sulfite
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