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Temperature-dependent sorption of naphthalene, phenanthrene, and pyrene to low organic carbon aquifer sediments

Environmental Science and Technology

By:
, , ,
DOI: 10.1021/es9406288

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Abstract

Sorption experiments were conducted with naphthalene, phenanthrene, and pyrene on low organic carbon sediments at 4 and 26 ??C using batch and column techniques. Experimental controls ensured the absence of biologic and photolytic activity and colloid-free solution supernatants. Equilibrium distribution coefficients (K(d)) increased 1.1-1.6 times with a decrease in temperature of 22 ??C. Fraction instantaneous sorption (F) values did not change significantly with a decrease in temperature of 22 ??C. Desorption rate constants (k2) decreased 1.2-2.6 times with a decrease in temperature of 22 ??C. Times to equilibrium were at least 40 h. The magnitude of observed K(d) and k2 values and the effect of temperature on K(d) (e.g., low enthalpy of sorption) are consistent with sorbate partitioning between the aqueous phase and small amounts of organic matter (f(oc) = 0.02%) on the sediments. The temperature dependence of K(d) and k2 may be small as compared to the effects of heterogeneities in field-scale aquifer systems. Thus, thermal gradients may not be of major importance in most saturated subsurface regimes when predicting solute transport. However, aquifer remediation pump-and- treat times could be decreased because increased temperature decreases both retardation and tailing.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Temperature-dependent sorption of naphthalene, phenanthrene, and pyrene to low organic carbon aquifer sediments
Series title:
Environmental Science and Technology
DOI:
10.1021/es9406288
Volume
30
Issue:
3
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Science and Technology
First page:
751
Last page:
760
Number of Pages:
10