近年来,由于环境分析工作的发展,出现了许多水质自动分析仪器,这些仪器在环境检测中发挥了重要的作用。砷作为有毒物质在水质监测中受到应有的重视。由于对砷污染的调查及常规监测的需要,研制砷的自动分析仪器显然是很有意义的。但是目前尚未见到测定水中砷的自动分析仪器产品。本文介绍我们研制的一种测定水中砷的自动分析仪。仪器的测量部分是根据双波长分光光度法的原理设计的。其基本原理是:以两种波长的单色光(其中之一为参比光)交替地照射样品,直接测量得两波长的吸光度差,利用吸光度 In recent years, due to the development of environmental analysis work, many automated water quality analysis instruments have appeared, and these instruments have played an important role in environmental testing. As a toxic substance, arsenic has received due attention in water quality monitoring. Due to the investigation of arsenic contamination and the need for routine monitoring, it is obviously of interest to develop arsenic automated analyzers. However, at present, there is no automatic analyzer for measuring arsenic in water. This article describes an automatic analyzer that we have developed to determine arsenic in water. The measuring part of the instrument is designed according to the principle of two-wavelength spectrophotometry. The basic principle is: to two kinds of wavelength monochromatic light (one of which is the reference light) alternately irradiated samples, direct measurement of the absorbance difference between the two wavelengths, the use of absorbance