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WRRCTR No.157 DBCP Volatilization from Soil and Water: A Laboratory Study with Two Hawaiian Soils

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Title: WRRCTR No.157 DBCP Volatilization from Soil and Water: A Laboratory Study with Two Hawaiian Soils
Authors: Pringle, Katherine W.
Liu, Clark C.K.
Green, Richard E.
Keywords: pesticides
soil contamination
agricultural chemicals
show 10 moreDBCP
soil fumigant
Wahiawa soil
Maile soil
Kunia well
central Oahu

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LC Subject Headings: Dibromochloropropane -- Hawaii -- Environmental aspects.
Groundwater -- Pollution -- Hawaii.
Soils -- Pesticide content -- Hawaii.
Soils -- Nematocide movement -- Hawaii -- Environmental aspects.
Water -- Pollution -- Hawaii.
Issue Date: Aug 1984
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Pringle KW, Liu CCK, Green RE. 1984. DBCP volatilization from soil and water: a laboratory study with two Hawaiian soils. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 157.
Series/Report no.: WRRC Technical Report
Abstract: DBCP (dibromochloropropane) has been used as a soil fumigant for nematode control for decades by the Hawaii pineapple industry. Recent detection (parts-per-trillion range) of the fumigant in potable well water has spurred a study of the behavior of DBCP in its Hawaiian environment. A volatile trapping apparatus was developed which proved to be highly efficient in capturing volatilized DBCP. Rates of DBCP volatilization from water were established for variations in air flow rate, temperature, and DBCP solution concentration. Measurements of cumulative DBCP volatilized at three solution concentrations indicated the applicability of Henry's law for solution concentrations up to 35 μg/ml. A soil cell, patterned after that developed by Spencer and associates, was used to determine volatilization rates for DBCP mixed uniformly in surface soils from the Wahiawa series of Oahu and the Maile series of Hawaii Island. The effect of Wahiawa soil-water content on DBCP volatilization (without water loss) was evaluated at water contents of 2.3, 8.5, 13.5, and 31.6% by volume. DBCP vapor flux was lower at 2.3% water content than at higher water contents for the first three days, possibly because of higher adsorption on the very dry soil. An untreated 0.02 m thick soil layer placed above DBCP-treated soil greatly retarded DBCP volatilization during the first two days. The
calculated effective liquid-vapor diffusion coefficient, De, for Wahiawa soil increased with soil water content from 6.1 x 10^-4 cm^2/s at 2.3% water content to 2.6 x 10^-3 cm^2/s at 31.6% water content.
Sponsor: U.S. Geological Survey, Water Resources Division; Hawaii State General Fund Grant/Contract No. S-0013
Pages/Duration: ix + 95 pages
Appears in Collections:WRRC Technical Reports

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