Determination of Trace Amounts of Arsenic in Waste Water by Primary-Secondary Wavelengths Spectrophotometry

Abstract

In sulfuric acid solution the conventional reaction of arsenic (As) with tin dichloride can from hydrogen arsenide in the presence of iodide and the product so formed reacts with diethyldithiocarbamate in chloroform medium to produce red silver colloid. The improvement for arsenic determination
in waste water is the first to be made by primary-secondary
wavelengths spectrophotometry (PSWS) using the above reaction. The
result shows that both the analytical precision and accuracy are increased
and gave out the higher sensitivity than the ordinary spectrophotometry.