砷化氢还原比色法是测定微量砷一种比较灵敏的分析方法。在吸收体系方面前人做了大量工作，其中铜试剂银盐法（AgDDC—吡啶—氯仿）已得到广泛应用。由于吡啶特殊恶臭，后来改用马钱子碱，二乙醇胺，三乙基胺，三乙胺，等体系来代替吡啶。据资料（5）介绍，这些体系灵敏度均不如吡啶。目前测定微量砷最灵敏最快速的方法除硼氢化钠 Arsine reduction colorimetry is a sensitive method for the determination of trace arsenic. In the absorption system has done a lot of work before, of which the silver reagent silver reagent (AgDDC-pyridine-chloroform) has been widely used. Due to the special odor of pyridine, later replaced by brucine, diethanolamine, triethylamine, triethylamine, and other systems to replace pyridine. According to the information (5), these systems are not as sensitive as pyridine. At present, the most sensitive and sensitive method for the determination of trace arsenic is sodium borohydride