渔业水质中总氰化物的测量不确定度评定

摘要

对异烟酸-巴比妥酸分光光度法测定渔业水质中总氰化物含量的不确定度进行评定。分析了不确定度的主要来源，包括测量重复性、标准溶液配制、定容体积和检测设备引入的不确定度。分别计算了各分量的不确定度，再计算出合成标准不确定度和扩展不确定度。结果表明，异烟酸-巴比妥酸分光光度法测定渔业水质中总氰化物含量的扩展不确定度为0.0004 mg/L(k=2)。%The uncertainty for the determination of content of total cyanide in fishery water by isonicotinic acid-barbituric acid spectrophotometric method was evaluated. Measurement repeatability, standard solution preparation, volume and detection equipment were the main sources of uncertainty. The uncertainty of each variable, the combined standard uncertainty and the expanded uncertainty were calculated. The result showed that the expanded uncertainty was 0. 0004 mg/L(k=2).