RESUMO
The methods of separation, enrichment, and analysis of trace mercury in water samples in recent years were reviewed in the present paper. Many methods can be used to analyze trace mercury after separation and enrichment. Spectrophotometry is cheap and simple. Atomic fluorescence spectrometric method is accurate in quantitative analysis. The chromatography method is usually used in the morphological analysis of mercury. Multistep analysis of mercury can be done by joint methods in one time.
RESUMO
Objective To evaluate the uncertainty of determination of copper in water by flame atomic absorption spectrometry (FAAS) according to Evaluation and Expression of Uncertainty in Measurement.Methods Precision of the instrument,uncertainty of the certified values of standard reference materials used in the measurement and uncertainty arising from the preparation of various chemical solutions involved in the measurements were considered as the main sources of the combined uncertainty.Components of uncertainty and the combined uncertainty were deduced and calculated.We can obtain the evaluation of uncertainty of copper in water by FAAS.Results The concentration of copper in water was 0.55 mg/L calculated according to mathematical model established in the present study,combined standard uncertainty was 0.011 mg/L,expanded uncertainty was 0.02 mg/L,and the expression of the uncertainty was (0.55?0.02)mg/L.Conclusion This method can be used for evaluation of uncertainty of determination of copper in water by FAAS.