摘要
建立了用重铬酸钾法测定水中COD测定的不确定度数学模型,用“鱼刺图”方法排列出每种可能作为来源的影响因素,并从标准溶液制备、样品滴定、水样移取等方面分析了COD监测结果的不确定度,计算了各不确定度分量值并给出了扩展不确定度,从中得出在标准滴定溶液制备过程中,重铬酸钾溶液的制备是最具权重的分量,其中标准物质质量的不确定度又是最大的分量,提高天平的精度对COD的不确定度会有明显改善。
Establlshing a model of chemical oxygen detection with potassium dichromate in water by titration, find every possible factors with ＂fish bone picture＂, and analyzing the uncertainty from Preparations of standard solutions, titration of sample and water sampling. Calculating every value of uncertainty and expanded uncertainty. Find the top - drawer factor in preparations of standard solutions, the maximum uncertainty is the weight of standard substance, increasing the precision of scale can improve the uncertainty.
出处
《环境科学与管理》
CAS
2006年第5期144-146,共3页
Environmental Science and Management
