废水中微量2,4-二硝基甲苯的动力学光度测定法

Determination of Micro 2,4-Dinitrotoluene in Wastewater by Kinetic Spectrophotometry

目的研究废水中微量2,4-二硝基甲苯的简便、快速及灵敏的测定方法。方法在盐酸介质中,利用微量2,4-二硝基甲苯能阻抑高碘酸钾氧化亚甲基蓝的褪色作用,用动力学光度法测定其含量。结果该法测定2.4-二硝基甲苯浓度的线性范围为0.20×10^(-5)-1.8×10^(-5)g/ml,检出限为1.7×10^(-7)g/ml。用于废水中微量2,4-二硝基甲苯的测定,标准加入回收率为95.6％-99.1％,相对标准偏差1.5％-2.6％。结论该法简便,快速,适于环境水样中微量2,4.二硝基甲苯的测定。

Objective To establish an easy, rapid and sensitive method for determination of micro 2,4-dinitrotoluene in waste water. Methods Based on the fact that micro 2,4-dinitrotoluene could inhibit the discoloring oxidation reaction of methylene blue by KIO4 in the HC1 solution, micro 2,4-dinitrotoluene was determined using kinetic spectrophotometric method. Results A new kinetic spectrophotometric method for determination of micro 2,4-dinitrotoluene was established. The linear range of the method was 0.20×10^(-5)-1.8×10^(-5) mg/L, the detection limit was 1.7xlO'7 mg/L. When the method was applied to the determination of the 2,4-dinitrotoluene in waste water, its recovery rates in standard addition method were 95.6%-99.1% and the RSDs were 1.5%-2.6%. Conclusion The method was easier to operate and more rapid, which was suitable for the determination of micro 2,4-dinitrtoluene in wastewater.