Ion-associate of arsenic(V)-salicylic acid chelate with methylene blue in toluene: Application for arsenic quantification

Abstract

Extraction spectrophotometric method has been exploited for the selective detection and determination of arsenic in parts per million levels using salicylic acid and a cationic dye, methylene blue. Salicylic acid configures an anionic chelate with arsenic(V) and then the dye in turn forms a toluene soluble ion-associate. Using standard colour comparator chart, semi-quantitative determination of arsenic has been carried out. The method is devoid of any toxic chemical, is not interfered by phosphate, silicate, and common cations and has been successfully employed for the quantification of arsenic in real samples.