五步碘量法测定二氧化氯含量的不确定度评定

目的研究五步碘量法测定消毒剂中二氧化氯含量准确度的主要影响因素,确保测定的准确性。方法依据JJF1059-1999《测量不确定度评定与表示》中的测量不确定度评定理论进行评定。结果五步碘量法测定消毒剂中二氧化氯含量为20.4g/L,扩展不确定度为0.30g/L。结论测量重复性引入的不确定度分量所占比重最大,严格控制操作过程,可提高检测结果的准确性。

ASSESSMENT OF THE UNCERTAINTY OF MEASURING CHLORINE DIOXIDE BY FIVE STEP IODOMETRY METHOD

Objective To investigate the main influencing factors of measuring chlorine dioxide in disinfectant by five-step iodometry method in order to ensure the accuracy of measurement.Methods Assessment was based on JJFl059-1999 "Evaluation and Expression of Uncertainty in Measurement".Results The concentration of chlorine dioxide measured with five-step iodometry method was 20.4 g/L and the expanded uncertainty was 0.30 g/L.Conclusion The repeatability of the measurements exerts the largest influence on uncertainty of measurement.Strict control of operation procedures can improve the accuracy of measured results.