Trace Level Pesticide Detections in Arkansas Surface Waters
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- 作者：Scott A. Senseman ; Terry L. Lavy ; John D. Mattice ; Edward E. Gbur ; and Briggs W. Skulman
- 刊名：Environmental Science & Technology
- 出版年：1997
- 出版时间：February 1997
- 年：1997
- 卷：31
- 期：2
- 页码：395 - 401
- 全文大小：139K
- 年卷期：v.31,no.2(February 1997)
- ISSN：1520-5851
文摘
A pesticide survey of surface water was conducted in1989, 1990, and 1991 in Lawrence, Mississippi, Phillips,andJefferson counties in Arkansas to assess nonpoint sourcewater pollution. During these 3 years, 59-62 lake andriver/stream sites were sampled eight times and screened for17 pesticides commonly used in Arkansas. Pesticideswere extracted by solid-phase extraction (SPE) disks.Extractswere analyzed by gas chromatography-electron capturedetection (ECD) and high-performance liquidchromatography-UV detection (LCUV). Detections wereconfirmed by gas chromatography-mass spectroscopy(MS) or co-chromatography. The 256 detections duringthesurvey represented 14 pesticides. Metolachlor (25%oftotal detections), atrazine (22%), norflurazon (16%), andcyanazine (14%) were the most commonly detectedcompounds. A total of 5% of the total detections wasabovehealth advisories. Spring and summer samples provided73% of the total pesticide detections. Rivers andstreamswere responsible for 62% of the detections. Thehighestnumber of repeated detections of the same pesticide at asite was for cyanazine (six of eight sampling periods).