Uncertainty Evaluation for Determination of Effective Phosphorus in Soil by Inductively Coupled Plasma Optical Emission Spectrometry
In order to accurately determine the content of available phosphorus in soil,the inductively coupled plasma atomic emission spectroscopy(ICP-OES)was adopted for determination and the uncertainty caused by related factors in the determination process was evaluated.The sources of uncertainty during the whole experiment included the following five aspects:① uncertainty u(m)caused by sample weighing;② uncertainty u(Ⅴ)caused by the volume of the extraction solution(V)when the extraction solution is added;③ uncertainty u(Cs)caused by preparing the standard solution;④ uncertainty u(C0)caused by standard curve fitting;and ⑤ uncertainty u(R)caused by sample measurement repeatability.The results showed that the measurement repeatability,standard solution preparation and standard curve fitting had great influence on the uncertainty during the whole experiment.Therefore,in the actual sample determination process,we must pay attention to the uncertainty factors that have an impact on the results,and strengthen the quality control,to achieve accurate and reliable results.
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