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METHOD FOR THE DETERMINATION OF PERCHLORATE ANION IN PLANT AND SOLID MATRICES BY ION CHROMATOGRAPHY
Citation:
Ellington, J J. AND J J. Evans. METHOD FOR THE DETERMINATION OF PERCHLORATE ANION IN PLANT AND SOLID MATRICES BY ION CHROMATOGRAPHY. Presented at 22nd Annual Society of Environmental Toxicology and Chemistry Meeting, Baltimore, MD, November 11-15, 2001.
Impact/Purpose:
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.
Description:
A standardized method for the analysis of perchlorate in plants was developed, based on dry weight, and applied to the analysis of plant organs, foodstuffs, and plant products. The procedure greatly reduced the ionic interferences in water extracts of plant materials. Ion chromatography (IC) on an AS16 anion exchange column was used for separation of perchlorate from the ionic matrix. The method will be described in detail including the difficulties encountered and overcome through the use of various sorbents and techniques. Plant materials studied included 12 fruits and vegetables, tobacco, and salt cedar. The method detection limit ranged from 0.16 ppm for cucumber to 1.10 ppm for sweet corn. In addition to food matrices samples of vegetation and soil from the Las Vegas wash, which has a historical record of contamination with perchlorate, were analyzed. The method, based on analysis by IC, will be compared to other methods of analysis based on mass spectrometry, capillary electrophoresis, and Raman spectroscopy.