Sodium Thiosulfate (food grade) (Sodium Thiosulfate, Food Grade), commonly known as big soda and Haibo, is an inorganic thiosulfate with the chemical formula NASsOO·*5HOO (pentahydrate) and a relative molecular weight of 248.18. The chemical formula of anhydrous type is NANasOo₃ and the relative molecular weight is 158.11.Food grade sodium thiosulfate is odorless and has a salty taste. The substance is a colorless and transparent crystalline powder or particle. Common forms include pentahydrate crystal type and anhydrous powder type. It has no obvious odor and is easy to absorb moisture and agglomeration. Exposed to air, it is easy to weathering and lose crystallized water, and has excellent solubility.It is soluble in water and insoluble in ethanol. The aqueous solution is weakly alkaline with a pH value of about 8.0-9.5. It has excellent oxidation resistance, reduction and complexing properties. It is an important antioxidant, bleaching agent and dechlorination agent in food processing. At the same time, it can be used as a human trace element supplement (sulfur supplement), participate in the body's metabolic process, and is also an indispensable raw material in food, medicine, chemical industry, water treatment, gold metallurgy and other fields.When heated to 100℃, the crystallized water is lost and becomes anhydrous sodium thiosulfate. Continued heating to above 150℃ will decompose to produce sodium sulfate, sodium sulfide and sulfur. It needs to be sealed and stored in a cool and dry place, away from high temperature, open flame, acidic substances and strong oxidants to prevent moisture absorption, weathering and decomposition deterioration.It is mainly used for antioxidant, bleaching, and dechlorination in food processing. At the same time, it can be used in food additives, pharmaceutical excipients, feed additives, chemical raw materials, water treatment and other fields. It is used as an antioxidant, dechlorination agent, reducing agent, and complexing agent. It is also used in pharmaceutical detoxification, electronic cleaning, gold extraction and other processes.Its functions are both antioxidant, dechlorination, preservation and complex purification. It is non-toxic and harmless. It strictly complies with the standards for the use of food additives. It is one of the commonly used raw materials in the fields of food preservation, anticorrosion and industrial purification. It fits the current development trend of “high purification, greening, diversification and low carbonization” in the sodium thiosulfate industry.

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Application Description

1. It is used as an antioxidant, bleaching agent, and dechlorination agent in the field of food processing. It is mainly used in food processing such as fruit and vegetable processing, meat products, aquatic products, beverages, confectionery, baked goods, etc. It can prevent food oxidation, discoloration and browning, remove residual chlorine gas during food processing (such as drinking water, dechlorination after bleaching fruits and vegetables), extend food shelf life, improve food color and taste, and improve product quality. Strictly follow the standards for the use of food additives, in line with GB 1886.248-2016 "National Standard for Food Safety Food additive Sodium Thiosulfate" regulations, adapt to the needs of large-scale production of various foods, and can be used with Vitamin C, sodium iso-ascorbate and other excipients are used in combination to enhance the antioxidant effect.
2. The pharmaceutical industry is used as pharmaceutical excipients and antidotes for the production of detoxifying preparations, injections, topical lotions and other pharmaceutical products. It can be used as a special antidote for poisoning such as cyanide, arsenic, mercury, lead, bismuth, iodine, etc. To assist in alleviating the symptoms of poisoning. At the same time, it can be used as an intermediate and reducing agent for drug synthesis to assist in the smooth progress of drug synthesis, meet the high standards of the pharmaceutical industry, and meet the growing trend of demand in the pharmaceutical and health products industry, especially suitable for the high-end needs of the field of pharmaceutical detoxification.
3. In the chemical industry, it is used as a chemical raw material, reducing agent, and complexing agent for the production of thiosulfate, dyes, pigments, detergents and other chemical products. At the same time, it can participate in the redox reaction as a reducing agent for organic synthesis and a metal ion complexing agent, which is suitable for the upgrading needs of the fine chemical industry; At the same time, it can be used in high-purity sodium thiosulfate (electronic grade) applications. It can be used in the production of high-end electronic materials, electronic component cleaning, photovoltaic cleaning, etc., and can also be used in gold hydrometallurgy as a gold extractor in the alternative path of cyanide.
4. The feed industry is used as a feed additive for the production of livestock, poultry and aquatic feed. It can supplement the sulfur required for animal growth, promote animal metabolism, improve growth performance and immunity, improve feed utilization, prevent animal sulfur deficiency, and improve the quality of breeding products. At the same time, it can be used as a feed antioxidant to prevent oxidative deterioration of feed. It is one of the commonly used trace element supplementation and antioxidant raw materials in the feed industry, which meets the development needs of large-scale aquaculture industry.
5. In the field of water treatment, it is used as a water treatment agent, dechlorination agent, and reducing agent. It is used in domestic sewage, industrial sewage treatment, and drinking water purification. It can remove residual chlorine and heavy metal ions (such as mercury, lead, etc.) from the water, complex harmful impurities in the water, regulate the pH value of water bodies, and improve water quality. At the same time, it can be used as a corrosion inhibitor to protect water treatment equipment, adapt to the large-scale production needs of the electric water treatment industry, and meet the development trend of the environmental protection water treatment industry. It is one of the core dechlorination raw materials in the field of water treatment.
6. It is used as an extractant in the field of gold metallurgy and is used in the hydrometallurgical process of gold. It can replace cyanide for gold extraction. It is environmentally friendly and efficient. It fits the trend of environmental protection upgrading in the gold metallurgy industry. At the same time, it can be used for the recovery of precious metals (such as silver) in electronic waste to realize resource recycling and adapt to the needs of emerging resource recycling fields.
7. It is used as a bleaching agent, reducing agent, and fixing agent in the light industry, and is used in the production of papermaking, textiles, photography, daily chemicals and other products; it is used as a paper bleaching aid in the paper industry to improve the whiteness of the paper; it is used as a dechlorination agent after fabric bleaching in the textile industry to prevent yellowing of the fabric; it is used as a fixing agent in the photography industry to dissolve unexposed silver halide; it can also be used in cosmetics and other products as an antioxidant ingredient to improve product stability.
8. It is used as a chemical reagent in the laboratory, as a reducing agent, a reference reagent, a complexing agent, and a titration reagent. It is used in experimental operations such as chemical analysis, organic synthesis, and microbial culture. It can also be used to prepare buffers, calibrate experimental instruments, and assist in the smooth progress of various experiments. It is one of the commonly used reagents in the laboratory, especially suitable for redox titration experiments.