用于生态补偿监测的酸性高锰酸盐指数分析方法的改进

The Analysis Method Improvement of Acidic Permanganate Index for Ecological Compensation Monitoring

采用一种新的标定方法,即取蒸馏水后直接放入沸水浴中加热30min,再加硫酸和草酸钠标准使用溶液,然后用高锰酸钾溶液滴定。通过新旧方法准确度、精密度和实际样品的对比实验,结果表明改进后的标定方法与国标中的标定方法的测定结果无显著性差异。精密度的相对标准偏差为0.2%,准确度的相对误差小于5%,具有较高的精密度和准确度,确定该标定方法可以使用。

This study adopts a new calibration method which is directly bathing distilled water in boiling water for 30 minutes, dripping standard test solutions of sulfuric acid and sodium oxalate, titrating with potassium permanganate test solutions. By comparing degree of accuracy, precision and actual samples, the result showed no significant difference between the improved calibration method and GB calibration method （ relative standard deviation of precision is 0. 2%, and relative error of accuracy is less than 5% ）. This improved calibration method is considered to be a viable approach with high precision and accuracy.