以过氧化氢－联苯胺为指示反应，在柠檬酸钠弱碱性介质中建立了催化光度测定痕量敌百虫的新方法。方法灵敏度为0．054mg／L，线性范围为0～28．8mg／L，应用于痕量敌百虫试样的快速分析，结果满意。 Hydrogen peroxide - benzidine as an indicator reaction in sodium citrate weak alkaline medium was established catalytic spectrophotometry trace trichlorfon new method. The sensitivity of the method was 0.054 mg / L with a linear range of 0 ~ 28.8 mg / L. The method was applied to the rapid analysis of trace trichlorfon samples with satisfactory results.