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

摘要

In sulfuric acid solution the conventional reaction of arsenic (As) with tin dichloride can form 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 increaed and gave out the hight sensitivity than the ordinary spectrophotometry.