|Chemical properties||white monoclinic crystal; sulfur dioxide odor; soluble in water,
slightly soluble in alcohol.|
|Uses||1. Used as reducing agent, food preservatives and bleach.|
2. Used for the bleaching of cotton fabric and organic substance.
Used as reducing agents in dyes, paper, leather, chemical synthesis
and other industries. Used for the production of analgin and
aminopyrine intermediates in pharmaceutical industry. Used as
bleach, preservatives, and antioxidants of food grade products.
3. Sodium bisulfite is reduction bleach allowed to use in China. It
has bleaching effect on food and has a strong inhibitory effect on
the oxidase within plant foods. It can be used for candied fruit,
glucose, sugar, rock candy, caramel, candy, liquid glucose, dried
fruit, dried vegetables, vermicelli, bamboo shoots, mushrooms and
mushroom cans in provisions of our country, with a maximum use of
0.45g/kg; it can also be used for potato starch with a maximum use
amount of 0.2g/kg and a maximume residual amount (in terms of SO2)
of less than 0.03 g/kg.
4. Used as reductants in analysis and also as bleach and bacterial
5. Used as reducing agent, antiseptic, disinfectant and bleach.
|Identification test||Both sodium salt test (IT-28) and sulfite test (IT-30) are
|Content Analysis||Transfer 50ml of 0.1mol/L iodine solution into a flask with a
stopper, and then add 200mg of accurately weighed sample and plug.
After placed 5min, add 1ml of hydrochloric acid, and plus starch
test solution (TS-235) as an indicator. Titrate the excess iodine
with 0.1 mol/L sodium thiosulfate. Each mI of 0.1mol/L iodine
solution is equivalent to 3.203mg of sulfur dioxide (SO2).|
|Toxicity||ADI 0~0.7mg/kg (in SO2; including SO2 and sulfites; FAO/WHO, 2001).|
LD50 115 mg/k (rat, oral).
GRAS (FDA, § 182.3739, 2000).
|Usage limits||GB 2760-2001 (g/kg): candied fruit, dried fruits, dried vegetables,
vermicelli, glucose, sugar, rock candy, caramel, candy, liquid
glucose and cans of bamboo shoots, mushrooms and mushrooms 0.45;
potato starch 0.20 (Residue≤0.03); fresh glucose (tablet
gasification process, in sulfite) 2.4 (residual amount calculated
in SO2≤0.05, tablet packaging shall give clear indication of
FAO/WHO(1984): frozen shrimp, prawns, lobsters (raw product)
100mg/kg, (cooked products) 30mg/kg(in SO2); frozen french fried
potatoes 50mg/kg (in SO2); pineapple juice with anti-corrosion 500
mg/kg of (in SO2; only for manufacture).
Maximum residue levels (in SO2) of Japanese provisions: dried
apricots, dried peaches 2g/kg; gelatin 0.5g/kg; molasses, corn
syrup 0.3g/kg; fruit wine 0.35g/kg; shrimp 0.1mg/kg.
When applied to dry fruit, sodium bisulfite can be prepared into
0.2% to 3% solution to take dipping or spraying.
FDA, § 182.3739 (2000): shall not be used for meat, vitamin B and
EEC (1990): mainly for the preservation of alcoholic beverages.
|Production method||Add sodium sulphite mother liquor (containing NaHSO3 40%, Ph value
of 3 to 4) slowly into soda ash to generate sodium sulfite solution
(to the slurry Ph value of 7~8 for the end); transfer the above
sodium sulfite solution into series reactors (2 to 3) to absorb the
SO2 gas (10% to 13%) from the combustion of sulfur, forming sodium
bisulfite (to the reaction temperature no longer rising for the
end). In the reaction process, a large number of crystals
precipitate out, which is centrifuged to obtain the wet goods with
moisture content of 6% to 10%, and then dehydrated by air drying at
250 to 300 ° C to make the final products.|
2NaHSO3 + Na2CO3 → 2Na2SO3 + H2O + CO2↑
Absorb sulfur dioxide from the gas of sulfuric acid production with
soda ash solution to generate sodium bisulfite. After further
centrifugal separation and air drying at 250~300 ° C, the final
sodium bisulfite is obtained.
Na2CO3 + 2SO2 + H2O → 2NaHSO3 + CO2↑
|Hazards & Safety Information||Category: Corrosive items|
Toxicity classification: moderate toxicity
Acute Toxicity: Oral-Rat LD50: 2000 mg/kg; Abdominal-Mouse LD50: 675 mg/kg
Flammable hazardous characteristics :
The products can decompose into sulfur oxides when meeting heat;
Aqueous solution is alkaline and corrosive.
Storage and transportation characteristics :
Storehouse should be low-temperature, well-ventilated and dry.
Fire extinguishing agent: much water
Occupational Standard: TWA 5mg /m3; TWA 5 mg/m3
|Chemical Properties||white powder|
|Uses||Reducing agent; convenient source of sulfur dioxide.|
|Uses||As disinfectant and bleach, particularly for wool; in dyeing for
preparing hot and cold indigo vats; in paper-making in place of
sodium hyposulfite to remove Cl from bleached fibers; as stripper
(reducer) in laundering; to remove permanganate stains from skin
and clothing; to render certain dyes sol; manufacture of sodium
hydrosulfite; coagulating rubber latex; as preservative for
deteriorative liqs or solutions used for technical purposes; as
antiseptic in fermentation industries. As preservative and bleach
in food. Pharmaceutic aid (antioxidant).|
|General Description||White crystals or crystalline powder. Slight sulfurous odor.
Specific gravity 1.48. Strong irritant to skin and tissue.|
|Air & Water Reactions||Water soluble.|
|Reactivity Profile||Sodium bisulfite is a reducing agent. Emits highly toxic gaseous
sulfur dioxide gas when heated to decomposition or on contact with
mineral acids [Sax, 9th ed., 1996, p. 2949].|
|Health Hazard||Powder is irritating to eyes, nose, and throat and can irritate
skin. Ingestion may cause irritation of stomach. Very large doses
cause violent colic, diarrhea, depression, and death.|
|Fire Hazard||Flammable/combustible material. May ignite on contact with moist
air or moisture. May burn rapidly with flare-burning effect. Some
react vigorously or explosively on contact with water. Some may
decompose explosively when heated or involved in a fire. May
re-ignite after fire is extinguished. Runoff may create fire or
explosion hazard. Containers may explode when heated.|