Description

Thorin CAS NO 3688-92-4 is a high-purity analytical reagent and complexometric indicator, primarily known for its use in the spectrophotometric determination of thorium and other metal ions. Its value lies in its high selectivity and sensitivity, providing reliable and accurate results in critical analytical procedures. This product is essential for laboratories and industries involved in chemical analysis, metallurgy, nuclear technology, and environmental monitoring.

Application

• Spectrophotometric Analysis: Primary use as a chromogenic reagent for the quantitative determination of thorium (Th4+) and other metal ions like zirconium and uranium.
• Complexometric Titration: Acts as a metallochromic indicator in EDTA titrations for various metal ions, offering a sharp color change at the endpoint.
• Nuclear Industry: Used in the analysis and quality control of nuclear fuels and materials for thorium content.
• Geological & Mining: Assaying and exploration for rare earth elements and thorium-bearing minerals.
• Environmental Monitoring: Detection and quantification of trace metals in water, soil, and industrial waste samples.
• Research & Development: A key reagent in academic and industrial research involving coordination chemistry and analytical method development.
• Quality Control Labs: Employed in pharmaceutical and chemical manufacturing for impurity profiling and raw material analysis.

Basic Information

Product Name	Thorin
CAS No.	3688-92-4
Molecular Formula	C16H11AsN2Na2O10S2
Molecular Weight	576.30 g/mol
Synonyms	Thoron; Thoron I; Thorin I; 1-(2-Arsonophenylazo)-2-naphthol-3,6-disulfonic acid disodium salt; 2-(2-Hydroxy-3,6-disulfo-1-naphthylazo)benzenearsonic acid disodium salt; APANS; Arsenazo I; Neothoron
EINECS	223-011-2

Quality Control

Our Thorin is manufactured under strict quality management systems to ensure batch-to-batch consistency and high performance. Each lot undergoes rigorous analytical testing, including purity assay and identification, to meet the stringent requirements of analytical reagent grades. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain stability and shelf life.

Specification

Item	Specification
Appearance	Reddish-brown to brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Solubility (in Water)	Clear, red solution
Sensitivity Test (with Th4+)	Conforms

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