Determination of arsenic in soil by wavelength dispersive X-ray fluorescence spectrometry and uncertainty evaluation
Arsenic is one of the mandatory elements in the investigation of agricultural soil pollution because of its strong toxicity and continuous accumulation.In recent years,much concern had been paid to the pollution of arsenic in soil.Therefore,how to quickly and accurately detect arsenic in soil had become an urgent technical problem to be solved.A method for determining arsenic content in soils by wavelength dispersive X-ray fluorescence spectrometry(WD-XRF)was established.The results showed that the quantitative value of arsenic in the standard soil GSS-34 was consistent with the certificate value,the detection limit and the relative standard deviation of this method were 0.5 mg·kg-1 and 2.6％,respectively.Compared with other two standard methods,this method was easy to operate and had good accuracy and precision.Employing the mathematical model for uncertainty analysis,the uncertainty of the test results was evaluated,including the uncertainty components and the extended uncertainty.The results in this study provided a reference for laboratory quality management.
国家科技期刊平台
NSTL
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