Inorganic Gravimetric Analysis

Beamish, F. E.

doi:10.1021/ac60025a027

Cited by 5 publications

(1 citation statement)

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“…Suspended particulate matter (PM) collection by filtration and gravimetric analysis is the earliest and most widely used technique for obtaining ambient concentrations (Beamish and McBryde 1949;Dunmore et al 1964;Feeney et al 1984;Goetz 1953;Vaughan et al 1989). A blank filter is weighed on a laboratory balance, ambient air is drawn through it at known flow rates and durations, PM is retained while particle-free air exits the filter, the filter is re-weighed, the blank filter weight is subtracted, and the weight gain is divided by the sample volume to determine the PM concentration over the sample period.…”

Section: Introductionmentioning

confidence: 99%

Filter Processing and Gravimetric Analysis for Suspended Particulate Matter Samples

et al. 2017

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Aerosol sampling onto filter media with laboratory weighing before and after drawing air through the filter is the most commonly applied method to determine PM 2.5 and PM 10 concentrations. Although simple in concept, determining the net gain in weight from an aerosol deposit is complicated by adsorption of gases onto the filter, retention of water by the filter and the deposit, electrostatic charges that result in attraction of the filter to balance surfaces, contamination during filter handling, losses or additions to filter material, evaporation of semivolatile aerosols, and inhomogeneous sample deposits. Additional restrictions apply when the weighed filters are submitted to subsequent chemical speciation analyses. A precisely controlled environment, with clean air and constant temperature and humidity, is required for filter weighing and processing, and filters must be equilibrated at these conditions. Balances must have sensitivities of B1 lg, be calibrated with well-established primary standards, and be regularly serviced. Ionizing sources are used to neutralize electrostatic charges. Regular quality control and quality assurance procedures involve filter inspection for defects before and after sampling, periodic balance zero and span checks, replicate filter weights, and independent system and performance audits.

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