【摘要】 总磷作为评价水体富营养化的主要指标之一，是水产养殖过程中水质监测的重要检测指标。为了测定渔业水体中总磷含量的不确定度，依据GB 11893—1989《水质总磷的测定钼酸铵分光光度法》测量渔业水体中总磷含量，依据JJF 1059.1—2012《测量不确定度评定与表示》评定总磷含量的测量不确定度。通过建立测量模型，分析钼酸铵光度法在总磷测定过程中不确定度主要来源可分为3大类：样品重复测量引入的不确定度、试样在测定磷含量过程中引入的不确定度(包括磷标准贮备溶液引入的标准不确定度、磷标准使用溶液配制过程引入的不确定度、总磷标准曲线测试点移取过程引入的不确定度、总磷标准曲线拟合引入的不确定度和检测仪器测定总磷精密度引入的不确定度)以及样品在取样、消解、定容过程引入的不确定度。试样中总磷含量的测量结果可以报告为：C=(0.19±0.01)mg/L(k=2)。[中国渔业质量与标准，2024,14(3):08-15]更多还原

【Abstract】 Total phosphorus, as one of the main indicators for evaluating water eutrophication, is an important detection indicator for water quality monitoring in aquaculture processes. In order to determine the uncertainty of total phosphorus content in fishery water bodies, the total phosphorus content in fishery water bodies was measured according to GB 11893—1989 “Determination of total phosphorus in water quality-Ammonium molybdate spectrophotometric method”, and the measurement uncertainty of total phosphorus content was evaluated according to JJF 1059.1—2012 "Evaluation and Expression of Measurement Uncertainty". By establishing a measurement model, the main sources of uncertainty in the determination of total phosphorus by ammonium molybdate photometry can be divided into three categories: uncertainty introduced by repeated sample measurements The uncertainty introduced by the sample in the process of determining phosphorus content(including the standard uncertainty introduced by the phosphorus standard storage solution, the uncertainty introduced by the phosphorus standard solution preparation process, the uncertainty introduced by the total phosphorus standard curve testing point moving process, the uncertainty introduced by the total phosphorus standard curve fitting, and the uncertainty introduced by the detection instrument in determining the total phosphorus precision), as well as the uncertainty introduced by the sample in sampling, digestion The uncertainty introduced by the constant volume process. The expanded uncertainty of total phosphorus content in the sample can be expressed as: C=(0.19 ± 0.01) mg/L; k=2.[Chinese Fishery Quality and Standards, 2024,14(3):08-15]更多还原