Evaluating the Uncertainty Determination of Chemical Oxygen Detection in Water Sample by TitrationLI Sheng - zeng, LI Jin - ke, QIN Hua 1.2.3 Laiwu Environmental Monitoring Station,Laiwu 271100, ChinaAbstract: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.[著者文摘]