Adsorption and desorption of atrazine and deethylatrazine by low organic carbon geologic materials

Journal Article · Sun May 01 04:00:00 EDT 1994 · Journal of Environmental Quality

DOI:https://doi.org/10.2134/jeq1994.00472425002300030021x· OSTI ID:245331

Roy, W R; Krapac, I G ^[1]

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1. Illinois State Geological Survey, Champaign, IL (United States)

The adsorption and desorption of atrazine (2-chloro-4-ethylamino-6- isopropylamino-s-triazine) and a primary metabolite, deethylatrazine (2-amino-4-chloro-6-isopropylamino-s-triazine; DEA), by low organic C ({le} 3.3 g kg{sup -1}) materials were measured by batch-equilibrium techniques. The adsorbents were samples of glacial outwash sand, till, and stream sediments. The adsorption of both atrazine and DEA conformed to linear isotherms. The adsorption of atrazine by most of the absorbents yielded apparent K, values that were in excess of those based on surface agricultural soils. Adsorption correlated with only the pH of the sand-water suspensions. The desorption of atrazine was hysteretic under the conditions of the measurement. DEA had a lower affinity for the same adsorbents; the mean ratio of Kd values of DEA to those of atrazine was 0.37 {+-} 0.20. DEA adsorption did not correlate with organic C, surface area, clay content of the adsorbents, or with the pH of the suspensions. DEA adsorption, unlike atrazine, tended to be reversible. There was a linear relationship between the adsorption constants of atrazine and those of DEA. 40 refs., 8 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 245331
• Journal Information: Journal of Environmental Quality, Journal Name: Journal of Environmental Quality Journal Issue: 3 Vol. 23; ISSN JEVQAA; ISSN 0047-2425
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORPTION
AFFINITY
DESORPTION
ENVIRONMENTAL TRANSPORT
METABOLITES
PH VALUE
SAND
SEDIMENTS
SOILS
SORPTIVE PROPERTIES
SURFACE AREA
SUSPENSIONS
TRIAZINES
WATER