Evaluation of the TEOM method for the measurement of particulate matter for Texas cattle feedlots

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Title: Evaluation of the TEOM method for the measurement of particulate matter for Texas cattle feedlots
Author: Skloss, Stewart James
Abstract: The Tapered Element Oscillating Microbalance (TEOM ) sampler is an EPA approved Federal Equivalent Method Sampler for measuring PM10 concentrations . The Center for Agricultural Air Quality Engineering and Science (CAAQES ) owns two Rupprecht and Patashnick (R &P ) Series1400a monitors . The R &P Series 1400a monitor uses the TEOM method to measure particulate matter (PM ) concentrations and was approved by EPA in 1990 as an automated equivalent method PM10 sampler . Since its approval , many state air pollution regulatory agencies (SAPRAs ) have located R &P Series 1400a monitors at community -oriented monitoring sites . Some SAPRAs have even located TEOM samplers at the property line of major sources to determine if the source is meeting its permit requirements for PMc emissions . This thesis presents the results of PM10 and TSP concentrations measured with TEOM and low -volume gravimetric samplers at two Texas cattle feedlots . The purpose of this research was to compare the performance of the R &P Series 1400a monitor to the low -volume gravimetric sampler when sampling PM from a feedlot . Furthermore , this research was conducted to avoid the inappropriate regulation of cattle feedlots that may occur in the future as a consequence of the TEOM sampler being used to measure PMc emissions . The results of this research demonstrate that relationship between the R &P Series 1400a monitor and the low -volume gravimetric sampler is linear . In general , it was observed that the TEOM sampler measured higher PM10 and TSP concentrations than the low -volume gravimetric sampler when sampling downwind from a cattle feedlot . The opposite results were observed when sampling was conducted upwind from the feedlot . The collected data demonstrates that the concentration difference between the two sampling methods is linearly dependent with the concentration intensity for the upwind sampling locations . This trend was shown to be statistically significant . Another linear relationship was observed between the concentration difference and the particle size (mass median diameter and geometric standard deviation ) of the sampled dust . Although this trend was not statistically significant , it is believed that additional downwind concentration measurements would validate this relationship .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2634
Date: 2009-05-15

Citation

Evaluation of the TEOM method for the measurement of particulate matter for Texas cattle feedlots. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2634 .

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