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United States Department of Agriculture

Agricultural Research Service

Title: Use of Multiresidue Gas Chromatographic Analyses to Determine Pesticide Mobility on Soil Tlc Plates

item Mojasevic Milica, - UNIV BELGRADE, YUGOSLAVIA
item Helling, Charles

Submitted to: Journal of Environmental Science and Health
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 24, 1994
Publication Date: N/A

Interpretive Summary: Soil thin-layer (soil TLC), a technique for determining relative pesticide mobility, was improved through the development of a micro- scale, multi-residue procedure to quantify the leaching. The special advantages of this gas chromatographic analysis are that (a) radioisotopically-labeled chemicals are not required, and (b) leaching of individual compounds can be determined when co-applied with other pesticides. This study, with U.S. and Yugoslavian soils showed that movement of individual pesticides was not influenced by the presence of six other co-applied pesticides; this has implications for modeling environmental behavior of such pesticides applied as tank mixes.

Technical Abstract: A micro-extraction technique combined with GC/NPD was developed in order to estimate relative mobility of seven co-applied pesticides (alachlor, atrazine, carbofuran, cyanazine, ethoprop, metolachlor, and metribuzin) on soil TLC plates. A comparative study with 14C-labeled pesticides and autoradiography showed good agreement between the two techniques for determining the frontal or center Rf values on a silty clay soil. The results also showed that mobility of any one pesticide was not affected by the presence of the other co-applied chemicals.

Last Modified: 4/22/2015
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