Evaluations of EPA Approved FRM PM 2.5 and PM10 Samplers

The goal of this ongoing project is to develop an EPA-sanctioned process that will result in correction of “over-estimation” of PM₁₀(particulate matter size) and PM_2.5concentrations of PM emitted by agricultural operations. The assumption made by most regulators is that the EPA-approved PM₁₀and PM_2.5samplers accurately measure “true” PM₁₀and PM_2.5concentrations no matter the source of PM. This assumption is not correct. As a consequence of measurement errors of PM₁₀and PM_2.5concentrations associated with agricultural operations, those operations are being inappropriately regulated.

Texas A&M University researchers have been able to demonstrate to EPA the errors in sampling agricultural dusts with EPA approved samplers, when the samplers meet EPA performance criteria, with the help of the Agricultural Air Quality Task Force. Analysis of field data and preliminary laboratory data suggest that the samplers are not meeting EPA performance criteria when exposed to sources of large PM. The researchers also designed a wind tunnel to allow more accurate quantification of the overestimation associated with EPA-approved samplers. Evaluation of total suspended particulate samplers using the tunnel is underway.

Gin Management & Technology (GMT) Program and Mini-gin Enhancement Completion 

Engineering students at Mississippi State University will continue making improvements to the Mini-gin at the Mississippi Agricultural and Forestry Experiment Station/Agricultural and Biological Engineering Department. 

Specifically, this project will allow for modifications to be made to the Mini-gin’s lint cleaning system and the feeding of seed cotton from the last cleaning machine to the extractor feeder. Gin Management Technology (GMT) students have helped on past improvements and will assist on these modifications – a process that provides them with invaluable experience in installing, adjusting and maintaining gin equipment. 

These and other improvements will keep the Mini-gin “up-to-date” and make it similar to commercial gins. Another of the project’s objectives is to assist in the professional development, recruitment and placement of GMT students.