Overview
Arsenazo, also known as Arsenazo III, is a chromogenic reagent extensively used in analytical chemistry. It is particularly valued for its ability to form colored complexes with rare earth elements and thorium, making it indispensable in spectrophotometric analyses. The compound was first synthesized in the mid-20th century and has since become a standard reagent in laboratories worldwide. Arsenazo's high sensitivity and selectivity for specific metal ions have cemented its role in environmental monitoring, nuclear industry applications, and geochemical research. Its ability to detect trace amounts of metals in complex matrices makes it a preferred choice for quality control and research purposes.
Physical and Chemical Properties
Arsenazo appears as a dark purple to black powder and is soluble in water and alkaline solutions. Its molecular structure includes two arsenic atoms, which contribute to its high reactivity with metal ions. The compound decomposes before melting, indicating limited thermal stability. Key chemical properties include its ability to form intense colored complexes with rare earth elements, particularly lanthanides, and thorium. These complexes exhibit strong absorbance in the visible spectrum, enabling precise quantitative analysis. The reagent's stability in aqueous solutions and resistance to interference from common ions enhance its utility in diverse analytical protocols.
Main Applications
Arsenazo is primarily used in analytical chemistry for the detection and quantification of rare earth elements and thorium. Its applications span environmental testing, where it helps monitor metal contamination in water and soil. In the nuclear industry, it is employed to analyze thorium and uranium concentrations in ores and waste materials. The reagent is also utilized in geochemical research to study the distribution of rare earth elements in rocks and minerals. Additionally, Arsenazo finds use in clinical laboratories for specialized assays, though its toxicity requires careful handling. Its versatility and reliability make it a staple in laboratories focused on trace metal analysis.
Safety and Storage
Arsenazo is classified as harmful if swallowed or inhaled, necessitating strict safety measures. Laboratory personnel should wear gloves, goggles, and respirators when handling the powder. Work should be conducted in a fume hood to minimize exposure to airborne particles. Storage conditions are critical to maintaining the reagent's stability. Arsenazo should be kept in a cool, dry place, protected from light and moisture. Containers must be tightly sealed to prevent degradation. Spills should be cleaned up immediately using appropriate absorbent materials, and contaminated surfaces should be washed thoroughly.
B2B Procurement Guide
When procuring Arsenazo, buyers should prioritize suppliers with verified certifications and a track record of providing high-purity chemicals. Key considerations include the reagent's CAS number (1668-00-4) and purity level, typically 95% or higher for analytical applications. Prices vary based on purity and quantity, with bulk purchases often attracting discounts. Buyers should request material safety data sheets (MSDS) and certificates of analysis (CoA) to ensure compliance with safety and quality standards. Lead times may vary, so planning ahead is advisable, especially for large orders.
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