Uncertainty estimation in analysis of particulate-bound mercury in different size fractions of PM(10) in ambient air

作者：Gajghate D G; Khaparde V V^*; Pustode T M; Pipalatkar P P; Rao C V Chalapati

来源：Accreditation and Quality Assurance, 2011, 16(8-9): 459-465.

DOI：10.1007/s00769-011-0785-y

• Particulate-bound mercury (P(Hg))
• Andersen cascade impactor
• DMA-80 mercury analyzer
• Uncertainty budget

Different size fractions with aerodynamic diameters of (9.0-10.0) mu m, (5.8-9.0) mu m, (4.7-5.8) mu m, (3.3-4.7) mu m, (2.1-3.3) mu m, (1.1-2.1) mu m, (0.7-1.1) mu m, and (0.4-0.7) mu m of PM(10) were collected on glass fiber filter using 8-stage Andersen cascade impactor. Samples were extracted using microwave acid digestion, and analysis was performed by Direct Mercury Analyzer, DMA-80. Uncertainty resulted due to sampling and analytical procedure was calculated by applying bottom-up approach. Significant sources of uncertainty are estimated, and an uncertainty budget is prepared for each fraction. Repeatability showed maximum contribution to uncertainty budget followed by calibration curve and volume of air. Estimated expanded relative uncertainties at the 95% confidence interval for particulate-bound mercury in different size fractions were between 15 and 26%.

• 出版日期2011-8