Ammonium thiosulfate

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Structural formula
2 Ammonium ion Thiosulfate ion
Surname Ammonium thiosulfate
other names


Molecular formula (NH 4 ) 2 S 2 O 3
Brief description

white odorless solid

External identifiers / databases
CAS number 7783-18-8
EC number 231-982-0
ECHA InfoCard 100,029,074
PubChem 6857883
Wikidata Q421453
Molar mass 148.21 g mol −1
Physical state



1.679 g cm −3

Melting point

150 ° C (decomposition)

  • Easily soluble in water (1033 g l −1 at 100 ° C)
  • almost insoluble in ethanol
safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
Toxicological data

2890 mg kg −1 ( LD 50ratoral )

As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ammonium thiosulfate is a chemical compound from the group of ammonium salts and inorganic thiosulfates .

Extraction and presentation

Ammonium thiosulphate can be obtained by reacting ammonium sulphite with sulfur or sulphides in aqueous solutions (partly with ammonia), oxidation of hydrogen sulphide , through reaction of ammonium hydrogen carbonate with sulfur dioxide .


Ammonium thiosulfate decomposes above 150 ° C, producing sulfur oxides, ammonia and nitrogen oxides.


Ammonium thiosulphate is used as a quick fixing salt (similar to sodium thiosulphate ) for the production of fixing baths in film technology, photo technology and X-ray technology and as a fertilizer.

Web links

Individual evidence

  1. a b c d e f g h i Entry on ammonium thiosulphate in the GESTIS substance database of the IFA , accessed on December 22, 2019 (JavaScript required)
  2. Data sheet ammonium thiosulfate (PDF) from Merck , accessed on March 17, 2010.
  3. ^ Karl Heinz Büchel, Hans-Heinrich Moretto, Peter Woditsch: Industrial Inorganic Chemistry. ISBN 978-3-527-29849-5 .
  4. Process for the production of ammonium thiosulfate (
  5. Safety data sheet (fld-friedland)  ( page no longer available , search in web archivesInfo: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. (PDF; 45 kB)@1@ 2Template: Toter Link /