碘化钾还原法测定自然水体中微量过氧化氢的研究

目的]优化碘化钾还原法测定过氧化氢的试验条件,测定天然水体中的过氧化氢含量。方法]对试验过程中的影响因素：温度、时间、pH、碘化钾及催化剂钼酸铵用量进行优化,选择过氧化氢的最佳测定条件。结果]在pH为4～6、室温25℃、添加4 ml碘化钾及催化剂钼酸铵100μl、反应时间15 min条件下0,～2.0×10-4mol/L范围内过氧化氢的浓度与吸光度成线性相关（R2=0.999 8）,最小检测限为1.5×10-6mol/L,所测自然水体中过氧化氢测的量为5.29～10.59×10-6mol/L。结论]该方法简单、快捷,可用于自然水体中微量过氧化氢的测定。

Potassium Iodine Reduction Method for Determining the Trace Hydrogen Peroxide in Water

Objective]The aim was to optimize the conditions for determining the content of hydrogen peroxide and determined the trace hydrogen peroxide in water.Method]The factors such as temperature,time,and pH,the concentration of potassium iodine and ammonium molybdate were optimized by single factor test and selected the best determination of hydrogen peroxide conditions.Result]The result showed that under the conditions of pH 4-6,temperature25 ℃,the concentration of potassium iodine and ammonium molybdate were 4 mland 100 μl,the calibration curve was linear between 0 to 2.0×10-4mol/L,the detection concentration was 1.5×10-6mol/L.The content of the nature water was measured from 5.29 to 10.59×10-6mol/L.Conclusion]This method was simple and rapid.It was suitable for determining the content of the trace hydrogen peroxide.