Evaluation of uncertainty of trace iron content in water and steam of power plant detected by graphite furnace atomic absorption method

Abstract

Abstract: Abstract:The uncertainty of trace iron content in water and steam of power plant detected by graphite furnace atomic absorption method was evaluated. According to the files CNAS-GL06—2066 “Guidance on Evaluating the Uncertainty in Chemical Analysis” and JJF 1135—2005 “Evaluation of Uncertainty in Chemical Analysis Measurement”, the sources of the uncertainty during whole measurement process were analyzed. Each component of the uncertainty was calculated, and the expanded uncertainty on the measurement result was obtained. When the mass fraction of iron in water sample is 3.67μg/L, the expanded uncertainty is 0.16μg/L.In the various uncertainty components, the uncertainty brought by using the regression equation to calculate the iron content has largest influence, so it is necessary to control the related coefficients of the regression equation well. The influence of the digestion and volume calibration process on the uncertainty is very little and can be neglected.

Key words: Keywords:graphite furnace atomic absorption method, power plant, trace iron content, uncertainty

ZHAO Zhixiang, WU Suozhen, TAI Wenfang. Evaluation of uncertainty of trace iron content in water and steam of power plant detected by graphite furnace atomic absorption method[J]. Huadian Technology, 2014, 36(2): 33-35.

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Evaluation of uncertainty of trace iron content in water and steam of power plant detected by graphite furnace atomic absorption method

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