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目的评定对二甲氨基苯甲醛分光光度法测定水质肼含量的不确定度。方法参照JJF 1059.1-2012《测量不确定度评定与表示》建立不确定度评定程序,分析步骤按HJ 674-2013《水质肼和甲基肼的测定对二甲氨基苯甲醛分光光度法》执行,并据此建立测量模型,对各输入量引入的不确定度分量进行评定,并计算得到扩展不确定度。结果评定过程表明,重复测量引起的不确定度分量对最终测定结果不确定度的贡献最大,而分光光度计和玻璃量具引入的不确定度分量较小。结论为了获得质量更高的测试结果,应适当增加平行样品测定的次数,并尽量使用A级玻璃计量器具。
Aim To assess the uncertainty of determination of hydrazine in p-dimethylaminobenzaldehyde by spectrophotometry. Method reference JJF 1059.1-2012 “Evaluation and Expression of Measurement Uncertainty” to establish uncertainty assessment procedures, analysis steps according to HJ 674-2013 “Determination of water quality hydrazine and methyl hydrazine p-dimethylaminobenzaldehyde spectrophotometry” implementation, Based on this, a measurement model is established, and the components of uncertainty introduced by each input are evaluated, and the extended uncertainty is calculated. The results of the evaluation process show that the uncertainty caused by repeated measurements contributes the most to the uncertainty of final measurement results, while the uncertainty component introduced by spectrophotometer and glass gage is smaller. Conclusion In order to obtain higher quality test results, the number of parallel samples should be appropriately increased, and try to use Class A glass measuring instruments.