in water samples using a continuous membrane.pdf

Advances in Environmental Research 4Ž. 2000 225᎐231
Analysis anophosphorus pesticides in water
samples using a continuous membrane permeation
extractor
Ziming Sun, James K. HardyU
Department of Chemistry, The Uni¨ersity of Akron, Akron, OH 44325-3601, USA
Accepted 7 May 2000
Abstract
A membrane permeation method used for the determination anophosphorus pesticidesŽ. OPPs at trace
levels in water is described. OPPs were collected on Tenax-TA polymeric resin after permeating through a silicone
polycarbonate membrane. OPPs were then stripped by thermal desorption and directed into a gas chromatograph
using a helium stream for quantitative analysis. A linear relationship was found between the mass collected on
Tenax-TA and the product of external concentration and exposure time. The method detection limitsŽ. MDL for
OPPs were ᎐ ␮grl with the relative standard deviationsŽ. . less than 20%. This method provides an
easy, low-cost way of preconcentrating samples. It eliminates the involvement of anic solvent, and has the
potential for automated on-site analysis of OPPs in water. ᮊ 2000 Elsevier Science Ltd. All rights reserved.
Keywords: Organophosphorus pesticides; Membrane permeation sampling; Thermal desorption
1. Introduction the sum of pesticides in drinking waterŽ. EEC, 1998 .
For the purpose of protecting the quality of drinking
Organophos