Analytical quality control of determination of arsenic in water by hydride generation atomic fluorescence spectrometry / 中国地方病学杂志

ABSTRACT

Objective To implement analytical quality control(AQC) and predict analysis error of arsenic determination in water by hydride generation atomic fluorescence spectrometry,enhancing the technical level of testing arsenic and lab quality control capability,and to ensure the accuracy and reliability of test data.Methods According to the AQC procedure of water quality analysis for evaluating precision and accuracy of trace elements,arsenic content was measured in a blank solution(3％ hydrochloric acid solution),two kinds of standard solution (0.1C,0.9C arsenic standard solution,the C was the upper limit of measuring scope of the analytical method,and in this experiment the C was 20.0 μg/L),natural water sample and standard quality control sample(5.0 μg/L) with hydride generation atomic fluorescence spectrometry corresponding to GB/T 5750.5-2006.Results Of the five kinds of intra-samples and inter-assay,the difference was not significant statistically (F ＜ F0.05,all P ＞ 0.05).Total standard deviation (St) of every solution was less than 5％ of the concentration,the confidence limit of total average rate of recovery(R/d =0.99) was in a allowable range.The proficiency of testing samples were ZWAs =1.04 and ZBAs =1.12.The blind sample testing result was satisfactory.Conclusions Arsenic in water is determined by hydride generation atomic fluorescence spectrometry,and the analytical quality control is adopted by precision-bias analysis and accuracy quality control procedure.Ensuring that the error results are in a controlled range and highly reliable analytical results are obtainable.