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为了建立滴定法测定水中碳酸盐和碳酸氢盐的不确定度评定的方法。根据JJF 1135-2005《化学分析测量不确定度评定》方法对GB/T 8538-2008《饮用天然矿泉水检验方法》中滴定法测定碳酸盐和碳酸氢盐的不确定度进行分析评定。结果显示:滴定法测定水中碳酸盐和碳酸氢盐的相对不确定度分别为2.2%和5.1%(95%置信区间)。此方法对化学分析中滴定法造成的不确定度的评定具有指导意义。
In order to establish a method for the determination of the uncertainty of titration of carbonate and bicarbonate in water. According to the JJF 1135-2005 “Method for Evaluation of Uncertainty in Chemical Analysis”, the uncertainty of the determination of carbonate and bicarbonate by titration in GB / T 8538-2008 “Test method for drinking natural mineral water” is analyzed and evaluated. The results show that the relative uncertainties of titration for the determination of carbonate and bicarbonate in water are 2.2% and 5.1%, respectively (95% confidence interval). This method is of guiding significance for the evaluation of the uncertainty caused by titration in chemical analysis.