Manufacturer Good Price Sodium metabisulfite CAS:7681-57-4
Synonyms
Sodium Metabisulphite
Sodium metabisulfite, SO2 58.5%min;disodiummetabisulfite;
disodiumpyrosulphite;fertisilo;
metabisulfitedesodium;Sodiummetabisufite;SodiumMetabisulphiteAcs;SodiumMetabisulphiteExtraPure
Applications of Sodium metabisulfite
Sodium metabisulfite Sodium Metabisulphite, manufactures sodium metabisulfite by reacting sulfur dioxide with sodium carbonate (soda ash), purifying and drying to form crystals or powder.
Na2CO3 + 2SO2→Na2S2O5 + CO2
Sodium metabisulfite (SMBS, Sodium disulfite) is a white, granular solid sodium salt. an inorganic compound made up of sodium, sulfur, and oxygen, and used in many industries:
1.in the pulp and paper industry, in the photographic industry and in the various other industries as a bleach or dechlorinator.
2.Food Grade sodium metabisulfite may be used as a food preservative. It is also commonly added to various food products and wines as a preservative.
3.Sodium metabisulfite can also be used in the manufacture of other chemicals, Used in production of cleaning agents, detergents, and soaps.
4.It also acts as a corrosion inhibitor in oil and gas industry, as a bleaching agent in the production of coconut cream, as the source of sulfur dioxide and in the destruction of cyanide in commercial gold cyanidation processes.
5.Gold mining industry: It is utilized in the precipitation of gold from auric acid as well as in the waste water treatment to remove hexavaent chromium as trivalent chromium by precipitation after reduction.
6.Preservative in photo developer solutions, it is used in photography.
7.Oxygen scavenge:it plays as an oxygen scavenger to eliminate the dissolved oxygen in wastewater and in pipes.
8.Sodium metabisulfite may be used as an initiator during the cross-linking polymerization of polybutadiene in the cores of the vesicle membranes.
9.It may be added as an antioxidant during the preparation of stock solutions of 6-hydroxydopamine in various studies.
10.Dechlorination in municipal wastewater, pulp & paper, power, and textile water treatment plants.
Specification of Sodium metabisulfite
|
ITEM |
|
|
Appearance |
WHITE OR LIGHT YELLOW CRYSTALLINE POWDER |
|
Na2S2O5 |
≥97 |
|
SO2 |
≥65.0 |
|
Fe |
≤0.002 |
|
As |
≤0.0001 |
|
WATER INSOLUBLE |
≤0.02 |
|
PH |
4-4.8 |
Packing of Sodium metabisulfite
25kg/bag Sodium metabisulfite
Storage should be at cool, dry and ventilate.
Q1: What is food-grade sodium metabisulfite? What are its core characteristics?
Food-grade sodium metabisulfite is a legally permitted food additive complying with the national GB2760 standard. It appears as white crystalline powder, is easily soluble in water, and forms a weakly acidic aqueous solution. It features excellent effects of anti-oxidation, color protection, preservation, bleaching and bacteriostasis, which can effectively inhibit enzymatic browning, oxidative discoloration and microbial growth in food. As a commonly used color-protecting and fresh-keeping auxiliary in food processing, it is safe and harmless to the human body when used in compliance with specified dosage limits.
Q2: What is the difference between food-grade and industrial-grade sodium metabisulfite? Can they be mixed?
The two products adopt completely different production standards, impurity limits and application scenarios, and mixing or substitution is strictly prohibited. Food-grade sodium metabisulfite is deeply purified with heavy metals and harmful impurities strictly controlled within food safety limits without toxic residues, which can be directly used for food processing. Industrial-grade product contains excessive impurities and heavy metals, mainly applied in industrial fields such as chemical industry, water treatment and printing and dyeing. Using industrial-grade products in food production will cause serious food safety problems and is an illegal operation.
Q3: Why does sodium metabisulfite produce a slight sulfur smell when dissolved in water? Does it mean the product is deteriorated?
This is not deterioration. Sodium metabisulfite will slowly release trace sulfur dioxide when dissolved in water, causing a slight sulfur odor, which is a normal physical and chemical property of the product and the core principle of its color protection and preservation functions. Qualified products have a faint odor with no pungent smell and present clean, dry white powder. Products with strong pungent odor, yellow discoloration and severe caking are deteriorated due to moisture absorption.
Q4: What are the core functions of food-grade sodium metabisulfite in food processing?
1. Color protection and browning prevention: It effectively inhibits enzymatic and oxidative browning of fruits, vegetables and fungi, prevents blackening and yellowing during processing, and maintains the original bright color of ingredients.
2. Anti-oxidation and fresh-keeping: It blocks food oxidation reactions, delays deterioration and aging of fruits, vegetables, dried goods and nuts, and extends the shelf life of food products.
3. Preservation and bacteriostasis: It inhibits the growth of microorganisms such as molds and bacteria, reducing the mildew and deterioration rate of pickled products, dried goods and preserved fruits.
4. Bleaching and brightening: It is used in the processing of dried fruits, candied fruits and sugar products to remove miscellaneous colors and improve product appearance and quality.
5. Bacteriostasis and preservation for brewing: It is applied in the production of wine, fruit wine and fermented beverages to inhibit bacteria, preserve freshness, stabilize wine flavor and prevent turbidity and deterioration.
Q5: What food processing scenarios commonly use sodium metabisulfite?
It is widely used in various fresh and dried food processing scenarios, including fresh fruit and vegetable preservation, fungus processing, preserved fruits and candied fruits, dried fruits and nuts, pickled vegetables, sugar products, wine and fruit wine, starch products, and quick-frozen foods. It is a common and compliant additive for fresh food processing and dried goods storage.
