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氰化氢是重要的化工原料之一。它是一种剧毒的气体,很容易扩散于空气中,给生产和使用现场人员造成危害。为了保证现场人员的身体健康和生命安全,需要测定空气中氰化氢的浓度。测定空气中氰化氢浓度的方法很多,如检测管法、比色法以及测定仪和试纸等。本文介绍用溴水和吡啶-巴比妥酸试剂比色法来测定空气中微量氰化氢。1953年已有人用吡啶-巴比妥酸试剂来测定CN~(-1)”。1964年这个试剂被用来测定空气中的氰化氢但操作中需用还原剂(2%的 As_2O_3溶液)除去剩余的溴,以免出现干扰而影响比色。我们的实践证明,当用溴水和吡啶-巴比妥酸试剂测定 CN~-时,不必加入还原剂,不会出现干扰。这样不仅使操作简化,并
Hydrogen cyanide is one of the important chemical raw materials. It is a highly toxic gas that can easily diffuse into the air, posing a hazard to production and use site personnel. In order to ensure the physical health and safety of the personnel in the field, the concentration of hydrogen cyanide in the air needs to be determined. There are many ways to determine the concentration of hydrogen cyanide in the air, such as the test tube method, colorimetric method and the analyzer and test strips. This article describes the determination of trace amounts of hydrogen cyanide in air using brominated water and pyridine-barbituric acid reagent colorimetry. The use of pyridine-barbituric acid was used to determine CN- (1) in 1953. This reagent was used to determine hydrogen cyanide in the air in 1964 but requires reductant (2% As 2 O 3 solution) Remove the remaining bromine, so as to avoid interference and affect the colorimetric.Our practice has proved that when using bromine and pyridine - barbituric acid reagent CN ~ -, do not have to add the reducing agent, will not interfere.This will not only make the operation Simplify, and