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Diffusion and Analysis of Carbon-14 Labeled Dieldrin in Soils¹

ABSTRACT

Liquid scintillation techniques were used in developing a rapid method for the analysis of carbon-14 labeled dieldrin in soils. Treated soil samples up to 1 g in weight were added to 20-ml liquid scintillation counting vials and the labeled dieldrin extracted into the toluene counting media. The diffusion coefficient of dieldrin was measured in soils of varying texture and relative humidity at 20C in transient state systems. At 53% relative humidity the diffusion coefficient in eight soils varied between 0.049 and 0.36 mm²/week. No correlation was found between soil texture and the diffusion coefficient. The diffusion coefficient in three soils varied between 0.40 and 0.64 mm²/week at 75% relative humidity and between 3.8 and 9.7 mm²/week at 94% relative humidity. At the higher humidity, the diffusion coefficient increased with increasing clay content.

¹ Contribution of the Department of Soils and Plant Nutrition, University of Calif., Riverside. This work has been supported in part by USDA Cooperative Agreement no. 12-14-100-9016 (41). Presented before Div. S-2, Soil Science Society of America, November 9, 1967. Washington, D.C.

² Assistant Chemist and former Postgraduate Soil Physicist, respectively, University of Calif., Riverside.

Received for publication June 20, 1069. Accepted for publication September 19, 1969.