重铬酸钾容量法测定啤酒厂污泥中有机质的不确定度评定

Evaluation of Uncertainty in Detecting Organic in the Sludge of Brewery Faltory by Potassium Dichromate

检验农用啤酒污泥是否符合农肥质量指标一般需要结合测量不确定度。以日常检验记录和实际检验过程为依据,评估了重铬酸钾容量法检验啤酒污泥有机质的测量不确定度。结果显示:方法回收率和测量重复性是啤酒污泥测量不确定度的主要来源,体积和质量分量一般可忽略,降低平行样之间的绝对差可显著提高符合性判定能力。在日常检验实施平行双样和加标回收质控措施并依据实际过程有针对性的评估测量不确定度,可提高日常检验符合性判定的可靠程度。

The test results of whether the brewery sludge is suitable for agriculture fertilizer usually needs to consider the uncertainty.The uncertainty of Potassium dichromate titration in brewery sludge was evaluated based on the daily inspection record and the actual testing.The result showed that the uncertainty of measurement was mainly derived from the recovery and repeatability,but not from volume and quantity of the sludge.In addition,reducing the absolute difference between parallel experiments could significantly improve the judgment.Therefore,performing two parallel experiment and spiking standard samples,plus the specific evaluation for each individual case can improve the reliability of the daily testing.