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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > December  >
In the Laboratory
Lab Experiment
The Distribution Coefficient of Atrazine with Illinois Soils: A Laboratory Exercise in Environmental Chemistry
Eric Dolan, Yan Zhang, and Douglas G. Klarup
Eastern Illinois University, Department of Chemistry, Charleston, IL 61920
Cover
December 1998
Vol. 75 No. 12
p. 1609
Abstract
The soil distribution coefficient (Kd) of the corn herbicide atrazine and the fraction of organic carbon (foc) were measured on Illinois soils of low and high organic-matter content collected by students. Reverse-phase high-performance liquid chromatography was used for the Kd determination, and the foc was measured through loss on ignition. Taking into account that uncertainty existed in both organic-matter fraction and distribution coefficient data, least squares analysis showed that the distribution coefficient varied linearly with the foc and followed the relationship Kd = 57.2 (± 4.9) x foc -0.06 (± 0.04). This confirms that soils with high levels of organic matter will retain organic molecules of low water solubility better than soils with low levels of organic matter. Students learned one way in which soil chemistry controls contaminant transport, and how meaningful relationships can be extracted even when the data are highly variable.
Supplement
The summary and detailed version of the laboratory experiment are Microsoft Word documents for Windows. The figures are contained in an Excel97 (Windows) document and a picture of atrazine is a bitmap document. These documents have been compressed in both a sit (Macintosh) and a zip (Windows) file. The laboratory experiment is also available as a pdf file and requires Acrobat Reader to be viewed.
*  Contents
*  Download
supp1609.pdf

supp1609.sit

supp1609.zip
More Information
*  Citation
 Dolan, Eric; Zhang, Yan; Klarup, Douglas G. J. Chem. Educ. 1998 75 1609.
*  Keywords
 Analytical Chemistry; Laboratory Instruction; Environmental Chemistry; Statistics / Data Analysis
*  History
 Created:
Last Updated:		 June 18, 1999
November 22, 2005
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