Sorption and Bound Residue Formation of Linuron, Methylparathion, and Metolachlor by Carrot Tissues: Kinetics by On-Line HPLC Microextraction
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- 作者：Luis E. Sojo ; Donald S. Gamble ; and Donald W. Gutzman
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：1997
- 出版时间：September 1997
- 年：1997
- 卷：45
- 期：9
- 页码：3634 - 3641
- 全文大小：219K
- 年卷期：v.45,no.9(September 1997)
- ISSN：1520-5118
文摘
The feasibility of determining the identities and kinetics behavior ofthree pesticides in carrot tissueslurries using a novel on-line HPLC microextraction was investigated.Linuron, methylparathion,and metolachlor were added to aqueous slurries of carrot tissueparticles smaller than 150 
es/entities/mgr.gif">m.For each pesticide, the solution phase and the total pesticiderecoverable from the whole slurryconcentrations were separately monitored over a 10 day period.Kinetics curves for three categoriesof chemical species including solution phase pesticides, labile sorbedfractions, and unrecoveredfractions were obtained. The linuron and metolachlor data areconsistent with the commonlyreported two-step sorption mechanism consisting of labile sorptionfollowed by intraparticle diffusion,but the methylparathion data resemble a combination of labile surfacesorption and solution phaseand/or surface chemical decomposition. It is concluded thatlaboratory test methods of this typecould be developed for assessing the risk of bound residue formation invegetables.Keywords: Bound; carrots; HPLC; kinetics; linuron; methylparathion;metolachlor; microextraction;sorption; residues