7783-18-8 Usage
Uses
Used in Metal Cleaning:
Ammonium thiosulfate is used as a cleaning agent for "white" metals, helping to remove impurities and maintain the metal's appearance and integrity.
Used in Photography:
In the photography industry, ammonium thiosulfate serves as a photographic fixing agent. It is considered a rapid fixer, acting more quickly than sodium thiosulfate fixers, which is crucial for the development process of photographic films and papers.
Used in Metal Cold-Working Lubricants:
Ammonium thiosulfate is utilized as a component in lubricants for metal cold-working. Its properties allow it to reduce friction and wear during the metalworking process, enhancing the efficiency and quality of the final product.
Used in Gold and Silver Leaching:
Ammonium thiosulfate finds application in the leaching of gold and silver due to its ability to form strong complexes with these metals. The process involves the use of copper as a catalyst and serves as a nontoxic alternative to gold cyanidation.
Used as a Fertilizer:
Ammonium thiosulfate can be used as a fertilizer, providing essential nutrients to plants and promoting growth.
Used in Coal-Waste Management:
Ammonium thiosulfate acts as an additive to coal-waste mixtures, helping to inhibit the formation of dangerous dioxins and furans, which are harmful environmental pollutants.
Used as an Analytical Reagent:
In laboratories, ammonium thiosulfate is used as an analytical reagent for various chemical analyses and tests, contributing to the accuracy and reliability of scientific research.
Manufacturing Methods:
Ammonium thiosulfate can be produced through the direct reaction of ammonium sulfite with sulfur. Additionally, in the ATS process, sulfur dioxide is absorbed from incinerated Claus tail gas in aqueous ammonia to produce ammonium sulfate and ammonium bisulfite in solution. This solution then passes to a converter where it flows countercurrent to hydrogen sulfide, resulting in the formation and concentration of ammonium thiosulfate to 60 wt%.
Toxicity
Ammonium thiosulfate exists as colorless, monoclinic or white crystals with ammonia like odor. It is very soluble in cold water; slightly soluble in acetone and insoluble in alcohol and ether. It is used to clean white metal; in lubricants for metal cold working, as an analytical reagent; fungicide, reducing agent; brightener in silver plating bath, and in hair waving preparations; fog screens, and cleaning compounds for zinc base die cast metals and it is used as a desiccant and defoliant in crop bearing plants. Inhalation of dust may irritate respiratory system. Contact with eyes or skin may cause irritation. Ingestion may be harmful.
References
1.https://pubchem.ncbi.nlm.nih.gov/compound/ammonium_thiosulfate#section=FDA-Requirements
2. https://en.wikipedia.org/wiki/Ammonium_thiosulfate
Air & Water Reactions
Hygroscopic. Very soluble in water.
Reactivity Profile
AMMONIUM THIOSULFATE is sensitive to heat. AMMONIUM THIOSULFATE is incompatible with magnesium and aluminum powder. Mixtures with sodium chlorate can cause an exothermic reaction which can then decompose explosively. . Reacts with strong oxidizers such as chlorates, nitrates, and nitrites to release toxic ammonia, hydrogen sulfide, and sulfur trioxide gases. Will not polymerize. Ammonia, hydrogen sulfide, and oxides of nitrogen and oxides of sulfur may form in fires [USCG, 1999].
Health Hazard
Inhalation of dust may irritate respiratory system. Ingestion could be harmful. Contact with eyes or skin may cause irritation.
Fire Hazard
Special Hazards of Combustion Products: Toxic ammonia, hydrogen sulfide, and oxides of nitrogen and sulfur may form in fires.
Safety Profile
Moderately toxic by ingestion.When heated to decomposition it emits toxic vapors ofNH4- and SOx.
Potential Exposure
Used as an agricultural chemical and
fungicide, metal lubricant; in cleaning metals; in photographic
chemicals, making other chemicals. A laboratory
reagent.
Shipping
UN3077 Environmentally hazardous substances,
solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous
material, Technical Name Required.
Incompatibilities
Contact with sodium chlorate may cause
a violent reaction. Corrodes brass, copper, and copperbased
metals.
Waste Disposal
Incinerate. It may be possible
to dispose of waste material at a municipal facility if
treated, neutralized and oxidized.
Check Digit Verification of cas no
The CAS Registry Mumber 7783-18-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 3 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 7783-18:
(6*7)+(5*7)+(4*8)+(3*3)+(2*1)+(1*8)=128
128 % 10 = 8
So 7783-18-8 is a valid CAS Registry Number.
InChI:InChI=1/2H3N.H2O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4)
