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  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > February  >
In the Laboratory
Reducing the Use of Agrochemicals: A Simple Experiment
M. M. Vidal, Olga M. S. Filipe, and M. C. Cruz Costa
Departamento de Ciências Exactas e do Ambiente—CERNAS, Escola Superior Agrária de Coimbra, Bencanta, 3040-316 Coimbra, Portugal
Cover
February 2006
Vol. 83 No. 2
p. 245
Abstract
This article describes a simple laboratory project to introduce students to nonpoint source pollution, which may interest undergraduate and graduate students of environmental or agricultural chemistry courses. Students become aware that dissemination of nutrients and pesticides is prone to surface runoff and groundwater leaching, causing damage to neighboring land. To demonstrate dissemination of such pollutants, we examine inorganic phosphorus as example of a common agrochemical. Students follow the movement of inorganic P into the groundwater. Gelatin gels containing inorganic P are prepared to obtain a continuous release of inorganic P with a controlled rate. The slow release of P allows fewer applications and less agrichemicals are needed, helping to prevent leaching with consequent reduction of groundwater contamination. Students compare the advantages of slow-release inorganic P versus its application by conventional methods.
Supplement
Additional background information and a detailed procedure, including Excel spreadsheets to aid in the calculations, are available.
*  Contents JCE2006p0245W.doc (Microsoft Word)
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JCE2006p0245W.zip
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*  Citation
 Vidal, M. M.; Filipe, Olga M. S.; Costa, M. C. Cruz. J. Chem. Educ. 2006 83 245.
*  Keywords
 Agricultural Chemistry; Applications of Chemistry; Environmental Chemistry; First-Year Undergraduate / General; Hands-On Learning / Manipulatives; Laboratory Instruction; Natural Products; Polymer Chemistry; Quantitative Analysis; UV-Vis Spectroscopy
*  History
 Created:
Last Updated:		 1/5/2006
1/9/2006
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