Stock solutions having concentration 1000 mg/L of As(III) was
prepared by dissolving As2O3 (SD Fine Chem.) in distilled water.
Working solutions were freshly prepared from the stock solution
as per the experimental requirements. As(III) concentration was
measured using UV–vis spectrophotometer (Elico, Model no. SL
210) at a wavelength of 535 nm, by silver diethyl dithiocarbamate
method