Effect of Rigid PVC Bailer Contact on Detection of Pesticides in Water Samples |
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| Authors: | WM Schuh RL Cline MJ Kosse DW Sletton |
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| Institution: | WM. Schuh is a hydrologist manager with the North Dakota State Water Commission, Bismarck, North Dakota. His primary responsibilities are in assessment of natural and artificial recharge and their effects on water supplies and water quality. He received an MS. degree in soil science from the University of Minnesota in 1982.;R.L. Cline is a hydrologist manager with the North Dakota State Water Commission, Bismarck, North Dakota. His primary responsibilities are aquifer management, and assessment of effects of water appropriation on ground water supplies and water quality, He received an MS. degree in geology from Kansas State University in 1976.;M.J. Kosse is the director of the Chemistry Division, North Dakota Department of Health and Consolidated Laboratories, Bismarck, North Dakota. She received a B.S. in chemistry from North Dakota State University in 1981.;D. W Sletton was formerly an organic chemist with the North Dakota Department of Health and Consolidated Laboratories, and is currently a water chemist for the City of Fargo Department of Utilities, Fargo, North Dakota. He received a B.S. in chemistry and electrical and electronic engineering from North Dakota State University in 1988. |
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| Abstract: | A field experiment was conducted to examine the effect of short-term (one minute) contact of pesticide-laden water with a polyvinyl chloride (PVC) bailer on quantitative laboratory measurements of seven pesticide concentrations in distilled water samples subsequently decanted from the bailer. Pesticides were tested at two initial concentrations (low. based on current FPA maximum contaminant levels, or MCL: and high, based on a multiple of approximately lour times the MCL). Pesticide species included bromoxynil, diclofop-m, dimethoate. MCPA, methyl parathion, propiconazole, and trifluralin. Dimethoate recoveries were poor for all treatments. For all other pesticides there was no systematic difference between pesticide concentrations measured before and after bailer contact. Effectiveness of bailer decontamination treatments consisting of distilled water rinse alone was related to water solubility (S) for each species. Distilled water samples decanted from a rigid PVC bailer following initial bailer contact with pesticide-spiked water, and after the bailer had been cleaned with a single distilled water rinse, had measured pesticide concentrations of less than 2 percent of the pesticide concentration in the initial pesticide-spiked water, regardless of S. A single distilled water rinse effectively removed all trace of contaminants having S> 500 mg/L. Multiple distilled water rinses, and multiple distilled water rinses followed by 15 bailings of a well, effectively removed all trace of contaminants having S> 50 mg/L. Below threshold S, cleaning effectiveness decreased as a power function of S. |
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