Uncertainty Evaluation for the Determination of Metasilicic Acid in Groundwater Samples by Molybdosilicate Yellow Spectrophotometry
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ABSTRACT
The measurement uncertainty for the analytical results of H2SiO3 in groundwater samples by molybdosilicate yellow spectrophotometry was evaluated using Continuous Propagation Model of Uncertainty. The main sources of measurement uncertainty came from sub-uncertainties of calibration solutions, calibration curve fitting and measurements. The uncertainty from molar masses of SiO2 and H2SiO3 was ignored because of their less contribution. The double-error regression was used in the course of standard curve fitting. Based on the quantitative analysis of each source, standard uncertainty of measurement results was obtained. Then the extended uncertainty of measurement results was calculated from standard uncertainty multiplied by an extended factor of 2 (under confidence probability of 95%).
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