用二乙氨二硫代甲酸银分光光度法测定畜禽饮用水中的砷

畜禽饮用水中砷在锌和酸作用产生新生态氢。在碘化钾和氯化亚锡存在下,使五价砷还原为三价砷。三价砷与新生态氢生成砷化氢气体。通过乙酸铅棉花去除硫化氢的干扰,然后与溶于三乙醇胺-三氯甲烷中的二乙氨基二硫代甲酸银作用,生成棕红色的胶态银,比色定量。结果试样含砷量m与吸光度B呈良好的线形关系,其回归方程为m=3.884 6×B-0.215 2,相关系数r=0.999 3,检出限为0.01 mg/l,对畜禽饮用水中的砷进行测定,相对标准偏差1.3。结论:方法灵敏,结果准确,适用于畜禽饮用水中砷的快速测定。

Study of determining arsenic in livestock table-water by lignocaine vulcanize silver-formate spectrophotometry

In the presence of potassium iodide and stannous chloride,zinc and acid action produces nascent state hydrogen that makes five valency arsenic(As)redused three vlency arsenic,then three vlency arsenic and nascent state hydrogen produces arsenic hydride gas.Eliminating the disturbance of hydrogen sulfide by lead acetate cotton,then acts Lignocaine vulcanize silver-formate in triethanolamine-chloroform,produces brownish-red collargol and colovimetry.Result indicated that the content of arsenic and absorbance ...