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This article in JEQ

  1. Vol. 32 No. 4, p. 1385-1392
     
    Received: June 16, 2002
    Published: July, 2003


    * Corresponding author(s): boyds@msu.edu
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doi:10.2134/jeq2003.1385

Aging Effects on the Sorption–Desorption Characteristics of Anthropogenic Organic Compounds in Soil

  1. Michael Sharer,
  2. Jeong-Hun Park,
  3. Thomas C. Voice and
  4. Stephen A. Boyd *
  1. Dep. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI 48824

Abstract

Field studies have demonstrated that prolonged pesticide–soil contact times (aging) may lead to unexpected persistence of these compounds in the environment. Although this phenomenon is well documented in the field, there have been very few controlled laboratory studies that have tested the effects of long-term aging and the role of differing sorbates on contaminant sorption–desorption behavior and fate in soils. This study examines the sorption–desorption behavior of chlorobenzene, ethylene dibromide (1,2-dibromomethane), atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine), and 2,4-D (2,4-dichlorophenoxyacetic acid) on one soil type after 1 d, 30 d, and 14 mo of aging. Sorption isotherms were evaluated after each aging period to observe changes in the uptake of each compound by soil. Desorption kinetic data were generated after each aging period to observe changes in release from soil, and desorption parameters were evaluated using a three-site desorption model that includes equilibrium, nonequilibrium, and nondesorption sites. The data indicate no statistically significant increase in sorption for ethylene dibromide or chlorobenzene from 1 to 30 d, although sorption of 2,4-D increased slightly, and sorption of atrazine decreased slightly. Statistically significant increases in linear sorption coefficients (K d), from 1 d to 14 mo of aging, were apparent for ethylene dibromide and 2,4-D. The K d values for chlorobenzene, measured after 1 d, 30 d, and 14 mo of aging, were statistically indistinguishable. Aging affected the distribution of chemicals within sorption sites. With aging, the desorbable fraction decreased and the nondesorbable fraction, which was apparent after only 1 d of pesticide–soil contact, increased for all chemicals studied.

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Copyright © 2003. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyPublished in J. Environ. Qual.32:1385–1392.