污水中微量砷的测定,目前普遍采用DDC银(二乙基二硫代氨基甲酸银)比色法。过去多用吡啶作吸收液效果最好,但吡啶气味难闻,有毒,操作人员难以长久忍受。我们采用3％三乙醇胺氯作吸收液,吸收效果比吡啶有提高。氟离子本身不干扰测定。我厂硫酸车间污水中含砷30—200毫克/升,含氟400—1000毫克/升,可以直接取样进行测定。但待测试样中含氟离子在 Determination of trace amounts of arsenic in sewage, DDC silver (diethyldithiocarbamate) colorimetric method is currently widely used. In the past the best use of pyridine as absorption solution best, but the smell of pyridine bad, toxic, difficult for operators to endure. We use 3% triethanolamine chloride as absorption liquid, the absorption effect is higher than that of pyridine. Fluoride itself does not interfere with the assay. I plant sulfuric acid plant wastewater containing arsenic 30-200 mg / l, fluorine 400-1000 mg / l, can be directly sampled for determination. But the test sample containing fluoride ions in the