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PW12 Pesticide II
(PW195) Adsorption Studies of Pesticide Chemicals: Development of a New Method in Thermogravimetric Analysis.
Scott, A1, Romero, N1, Sata, U1, Boyd, J1, Chinnasami, S1, Cobb, G1, Ramkumar, S1, 1 Texas Tech Univeristy-The Institute of Environmental and Human Health, Lubbock, Texas, USA
ABSTRACT- A novel and simple method has been devised to characterize the adsorption characteristics of pesticide chemicals onto a protective substrate. In the case of chemical adsorbent substrates, such as activated carbon-containing masks, protection is achieved primarily through the adsorption mechanism. A new approach has been developed to precisely quantify the adsorption of toxic chemicals by activated carbon using a thermogravimetric analyzer (TGA). In this study, the TGA is not used in the routine application to understand the thermal degradation of a material. This study utilizes TGA in an isothermal setting providing a continuous temperature and vapor flow rate to characterize the weight gain of chemical protective substrate which serves as a measure of adsorption. Results of the adsorption studies of several toxic chemicals such as organophosphate pesticides (OPs) and volatile organic chemicals (VOCs) by activated carbon fibers (ACFs) are presented. The novel protocol has been validated by Gas Chromotography-Flame Photometric Detection (GC-FPD) and Mass Spectrometry analysis to ensure the high level of accuracy and sensitivity of data collection. The new method will enable pesticide and protective equipment manufacturers to quantitatively characterize the dispersion of toxic chemicals as a function of adsorption.
Key words: pesticide, adsorption , thermogravimetric
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