HPLC (high-performance liquid chromatography) is an analytical method of great versatility and sensitivity. The use of silica-bonded non-polar stationary phases in place of the traditional polar stationary phases has resulted in the technique of reversed-phase chromatography. This has proved a most useful analytical tool, particularly for the analysis of biological samples. Furthermore the technique has great potential as a means of measuring a number of physicochemical properties.

Reversed-phase chromatography

Data through 2001 from the Integrated Atmospheric Deposition Network (IADN) were used to investigate the causes of variability in gas-phase polychlorinated biphenyl (PCB) and pesticide concentrations measured near Lakes Michigan, Erie, and Superior. A multiple linear regression model that incorporates temperature and time was used explain the variability in the concentrations. Our approach used autocorrelation analyses of the residuals to help us determine the effectiveness of the regression. Autocorrelation plots for the in-use pesticide lindane indicated that an agricultural application cycle was also present in the regression residual data at all sites. The addition of parameters for this effect to the regression equation accounted for, on average, 16% more of the variability in the data. Similar analyses for the in-use pesticide endosulfan did not show an agricultural application effect. The banned compounds DDT and chlordane showed that temperature and time correctly accounted for the variability in ...

Causes of Variability in Pesticide and PCB Concentrations in Air near the Great Lakes

Rapid analysis of cobalamin coenzymes and related corrinoid analogs by high-performance liquid chromatography

Schistosoma mansoni:Characterization of an α1–3 Fucosyltransferase in Adult Parasites

The chemical behavior of radionuclides can vary widely in soil and sediment environments Equally important, for a given radionuclide the physico-chemical properties of the solids and aqueous phase can greatly influence a radionuclides behavior Radionuclides can conceivably occur in soils as soluble-free, inorganic-soluble-complexed, organic-soluble, complexed, adsorbed, precipitated, coprecipitated, or solid structural species While it is clear that an assessment of a radionuclide?s soil chemistry and potential shifts in speciation will yield a considerable understanding of its behavior in the natural environment, it does not directly translate to bioavailability or its impact on ecosystems health The soil chemical factors have to be linked to food chain considerations and other ecological parameters that directly tie to an analysis of ecosystem health In general, the movement of radionuclides from lower to higher trophic levels diminishes with each trophic level in both aqua tic and terrestrial systems In some cases, transfer is limited because of low absorption/assimilation by successive trophic organisms (Pu, U); for other radionuclides (Tc, H) assimilation may be high but rapid metabolic turnover and low retention greatly reduce tissue concentrations available to predator species Still others are chemical analogs of essential elements whose concentrations are maintained under strict metabolic control inmore » tissues (Cs) or are stored in tissues seldom consumed by other organisms (Sr storage in exoskeleton, shells, and bone) Therefore, the organisms that receive the greatest ingestion exposures are those in lower trophic positions or are in higher trophic levels but within simple, short food chains Food source, behavior, and habitat influence the accumulation of radionuclides in animals« less

Dynamics and transformations of radionuclides in soils and ecosystem health.

Relationship of Urinary Methylmalonic Acid to Vitamin B-12 Concentrations and Hematologic Changes in Rats Fed Vitamin B-12-Deficient Diets

Sensitive chemical method for routine assay of cobalamins in activated sewage sludge

Production of cobalamins during activated sewage sludge treatment

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Relationship of Urinary Methylmalonic Acid to Vitamin B-12 Concentrations and Hematologic Changes in Rats Fed Vitamin B-12-Deficient Diets

Sensitive chemical method for routine assay of cobalamins in activated sewage sludge

Production of cobalamins during activated sewage sludge treatment