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SM ISO690:2012 CADOCHNIKOV, Oleg. Accelerated solvent extraction as an alternative technique for the chlorinated pesticides extraction from contaminated soil. In: Ecological Chemistry, Ed. 3rd, 20-21 mai 2005, Chişinău. Chișinău, Republica Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2005, 3rd, pp. 271-272. ISBN 9975-62-133-3. |
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Ecological Chemistry 3rd, 2005 |
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Conferința "Ecological Chemistry" 3rd, Chişinău, Moldova, 20-21 mai 2005 | ||||||
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Pag. 271-272 | ||||||
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Extraction efficiency of the chlorinated pesticides from contaminated soil was the aim of the experiment. DDE was used as a soil contaminant. For more precise tracing of the contaminant mix of “cold” and “hot” (“labeled” C14) DDE was used. Studied soil had the following properties: moisture level – 4%, sand content – 28.9%, silt content– 47.1%, clay content – 24%, total carbon content – 3.5%, inorganic carbon – 0%, organic carbon content – 3.4%, pH – 6.7. Contamination level of the soil was equal 0.5 μg/g. For each sample 10 g of soil was used. The soil was contaminated using dropwise method. Accelerated solvent extraction using ASE300 apparatus from Dionex company was chosen as the principal extraction method. The operating conditions of the ASE300 were: 1) eluting solvent – acetone 2) flush volume – 80% 3) heating time – 5 min 4) static extraction time – 5 min 5) temperature – 100oC 6) pressure – 1500 psi 7) purge gas – nitrogen 8) purge time – 60 sec. 9) number of cycles - 2. Determination of DDE in acetone solution was fulfilled with Liquid Scintillation Counter (Tri-Carb model). As a result, optional conditions for DDE extraction from contaminated soil were found during experiment. It was proved that the abovementioned operating conditions allow to extract about 93% of applied contaminant from soil. So, accelerated solvent extraction is suitable to be used as an alternative extraction method for determination of the chlorinated pesticides in soil. |
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