Abstract
A simple, sensitive and selective micelle solubilization spectro-photometric method is described for the determination of micro amounts of antimony(III) in waste water with 2-(3,5-dibromo-2-pyri-dylazo)-5-diethylaminophenol (3,5-dibromo-PADAP) as colour reagent and emulsifier OP as solubilizing and sensitizing agent. In 0.15M HCl, antimony forms a blue-green ternary complex with the above-mentioned reagents. The complex exhibits maximum absorption at 630nm, and the value of the apparent molar absorption coefficient is found to be 5.2 × 1041 mol−1 cm−1. The complex is stable up to 7 days at room temperature. The system obeys Beer's Law in the range 0–25 μg Sb(III) per 10 ml. Most metal ions do not interfere with the determination of antimony.
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