Description

Ammonium Hydrogen Thiosulphate is an inorganic ammonium salt of thiosulfuric acid, widely recognized for its role as a source of thiosulfate ions. This compound is valued in industrial processes for its reducing and complexing properties, which are critical for applications ranging from metal treatment to photographic development. It serves as a key chemical for manufacturers and processors in the electronics, mining, and water treatment industries seeking reliable and consistent performance.

Application

• Photographic Fixing Agent: A critical component in photographic developers and fixers to dissolve unexposed silver halides from film and paper.
• Gold and Silver Leaching: Used as an alternative lixiviant to cyanide in the hydrometallurgical extraction of precious metals from ores.
• Water Treatment: Acts as a dechlorinating agent to neutralize residual chlorine in wastewater and industrial effluent streams.
• Electroplating & Metal Finishing: Employed in electroplating baths and surface treatment processes for metal cleaning and brightening.
• Chemical Synthesis: Serves as a reagent and sulfur source in various organic and inorganic synthesis pathways.
• Analytical Chemistry: Used in iodometric titrations and as a standard in quantitative analysis.

Basic Information

Product Name	Ammonium Hydrogen Thiosulphate
CAS No.	10103-43-2
Molecular Formula	NH4HS2O3 or (NH4)2S2O3·H2O
Molecular Weight	148.20 g/mol (for NH4HS2O3)
Synonyms	Ammonium Thiosulfate, Monoammonium Salt; Ammonium Monothiosulfate; Ammonium Acid Thiosulfate; Thiosulfuric Acid, Monoammonium Salt; ATS; Ammonium Thiosulphate Solution; Fixing Salt
EINECS	233-275-1

Quality Control

Our Ammonium Hydrogen Thiosulphate is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure it meets precise chemical and physical specifications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can lead to caking or decomposition.

Specification

Item	Specification
Appearance	White to off-white crystalline solid or solution
Identification (IR)	Conforms
Assay (as NH4HS2O3)	≥ 95.0 %
pH (5% solution)	4.0 - 6.0
Heavy Metals (as Pb)	≤ 10 ppm
Insoluble Matter	≤ 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.