一、前言 高温合金中砷的测定以往采用蒸馏分离后铝兰比色,此法灵敏度虽能达到要求,但手续冗长。近年来,普遍采用碘化物萃取分离砷,但钨的存在妨害砷的分离。文献介绍了二乙(基)二硫代氨甲酸银应用于锗、矿石、水和尿中微量砷的测定,以及砷化氢纸上比色法应用于难熔合金中砷的测定。近年来也有不少文献对反应机理、显色介质和应 First, the preamble Determination of arsenic in the past, the use of distilled alum after the colorimetric, although the sensitivity of this method can meet the requirements, but lengthy procedures. In recent years, iodide extraction is widely used to separate arsenic, but the presence of tungsten hinders the separation of arsenic. The literature describes the determination of trace amounts of arsenic from diethyl- dithiocarbamate in germanium, ores, water and urine, and the determination of arsenic in refractory alloys by arsine paper colorimetry. In recent years, there are many literature on the reaction mechanism, color media and should