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DETERMINATION OF PERCHLORATE IN SOME FERTILIZERS AND PLANT TISSUE BY RAMAN SPECTROSCOPY
Collette, T W. AND T. L. Williams. DETERMINATION OF PERCHLORATE IN SOME FERTILIZERS AND PLANT TISSUE BY RAMAN SPECTROSCOPY. Presented at 222nd American Chemical Society National Meeting, Chicago, IL, August 25-30, 2001.
Elucidate and model the underlying processes (physical, chemical, enzymatic, biological, and geochemical) that describe the species-specific transformation and transport of organic contaminants and nutrients in environmental and biological systems. Develop and integrate chemical behavior parameterization models (e.g., SPARC), chemical-process models, and ecosystem-characterization models into reactive-transport models.
We have successfully used Raman spectroscopy for the direct qualitative and quantitative analysis of perchlorate in fertilizer extracts without the need for chromatographic separation. This approach is attractive because Raman is not hindered by the presence of water or of high TDS, and it can be a definitive technique for qualitative identification. We have also applied this method to the identification of perchlorate in extracts of lettuce that have been grown in a greenhouse using irrigation water spiked with high levels (10 ppm) of perchlorate. Note that our goal is not to replace IC as the recommended method for the quantitative determination of perchlorate, but, instead, to provide a confirmatory technique to be used in conjunction with IC, particularly for samples exhibiting high TDS.