The effects of various pre-weighing procedures on the reported weights of air pollutants collected by filtration Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mc87pt619

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  • A study was conducted to determine what effects the type of pollutants, storage conditions, storage time, and method of sample conditioning have on the reported weight of an air pollutant collected by filtration. Samples were collected from a refuse dump, an arc furnace smelting nickel ore, and a rotary kiln burning car bodies. These three sources of samples represented extremes in moisture content and organic matter. An initial weight was determined; then each sample was put through a certain procedure before final weighing. These procedures included storage times from one to twenty-five days, freezing and ambient storage, and sample conditioning by heating and desiccation. Data were analyzed using a graphical approach. The type of pollutant, storage conditions, storage time, and method of sample conditioning significantly affected the reported weights of air pollutants. It was found that the magnitude of the weight loss caused by a particular type pollutant and pre-weighing procedure was dependent on the percent of organic matter initially present. The method of sample conditioning had the greatest effect on weight losses. This effect, again, was dependent on the percent of organic matter initially present. Conditioning by heating for a certain sample containing 60% organic matter resulted in a 25% loss of sample weight. Time and storage conditions had slight effects on reported weights. These effects were amplified for pollutants containing high percentages of organic matter. Frozen storage and conditioning by desiccation in all cases proved to be the best procedure to follow for minimization of errors affecting the reported weight of an air pollutant.
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