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Wang Y.-P.,National Research Center for Geoanalysis | Xu C.-X.,National Research Center for Geoanalysis | Dai A.-F.,National Research Center for Geoanalysis | Dai A.-F.,Anhui Institute of Geological Experiment | And 2 more authors.
Geological Bulletin of China | Year: 2012

The measurement uncertainty of the analytical results of B in groundwater samples by inductively coupled plasma-mass spectrometry (ICP-MS) was evaluated using continuous propagation model of uncertainty and the regression of x, y double error was used in the course of standard curve fitting. The main sources of measurement uncertainty include the sub-uncertainties of standard stock solution, the preparation of the standard series solution, repeated measurements and the fitting of standard curve. Compared with the uncertainty results obtained by the least squares linear fitting, the results obtained by the regression of double error are more accurate for relatively high concentrations. Source


Wang Y.-P.,National Research Center for Geoanalysis | Pan H.,Heilongjiang Institute of Geology and Mineral Test and Application | Xu C.-X.,National Research Center for Geoanalysis | Dai A.-F.,National Research Center for Geoanalysis | And 3 more authors.
Geological Bulletin of China | Year: 2012

The measurement uncertainty of the analytical results of Ag in groundwater samples by inductively coupled plasma-mass spectrometry (ICP-MS) was evaluated using continuous propagation model of uncertainty. The regression of double error was used in the course of standard curve fitting. The extended uncertainty of measurement results was obtained from the synthesis of uncertainties from each source. When the silver content of the actual samples is relatively low, the uncertainty generated in the course of standard curve fitting is comparatively large and even becomes the dominant factor. Source


Dai A.-F.,National Research Center for Geoanalysis | Dai A.-F.,Anhui Institute of Geological Experiment | Xu C.-X.,National Research Center for Geoanalysis | Yuan J.,National Research Center for Geoanalysis
Geological Bulletin of China | Year: 2012

The measurement uncertainty of the analytical results of phenol in groundwater samples by 4-Amino antipyrine chloroform extraction spectrophotometry was evaluated using continuous propagation model of uncertainty. The standard uncertainty of a groundwater sample was evaluated and the expanded uncertainty was calculated, which shows the measurement is credible. The results show that the uncertainty caused by the curve fitting and the sample preparation makes a relatively great contribution to the expanded uncertainty. Source


Xu C.-X.,National Research Center for Geoanalysis | Zhang Z.-E.,Bureau of Mineral Resources | Wang Y.-P.,National Research Center for Geoanalysis | Dai A.-F.,National Research Center for Geoanalysis | And 3 more authors.
Geological Bulletin of China | Year: 2012

The measurement uncertainty of the analytical results of sulfides in groundwater samples by para-amino aniline photometric method was evaluated using continuous propagation model of uncertainty. At the key step of standard curve fitting, the authors adopted the double-error curve fitting in comparison with the least square method. The results show that, for the higher concentration samples, the results of double-error curve fitting are more accurate, and when double-error curve fitting is adopted to quantify the actual samples, the appropriate concentration range of standard curve should be selected, in which the concentration of the samples falls into the range of higher concentration, so that the results are more accurate and reasonable. Source


Yuan J.,National Research Center for Geoanalysis | Wang Y.-P.,National Research Center for Geoanalysis | Xu C.-X.,National Research Center for Geoanalysis | Wang S.-M.,National Research Center for Geoanalysis | And 2 more authors.
Geological Bulletin of China | Year: 2012

The measurement uncertainty of the analytical results of T1 in groundwater samples by inductively coupled plasma-mass spectrometry (ICP-MS) was evaluated using continuous propagation model of uncertainty. The regression of double error was used in the course of standard curve fitting. The extended uncertainty of measurement results was obtained from the synthesis of uncertainties from each source, but the uncertainty from pretreatment procedure was not considered. When the thallium content of the actual samples is relatively low, the uncertainty generated in the course of standard curve fitting is comparatively large and even becomes the dominant factor. When the content of thallium is high, the uncertainty from standard curve fitting is relatively insignificant. Source

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