Systematic evaluation of dissolved lead sorption losses to particulate syringe filter materials.

Distinguishing between soluble and particulate lead in drinking water is useful in understanding the mechanism of lead release and identifying remedial action. Typically, particulate lead is defined as the amount of lead removed by a 0.45-μm filter.

Trace metal leaching behavior studied through the use of parametric modeling of water borne soil particles fractionated with a split-flow thin cell.

Leaching of particle-bound metals affects the ability of settling ponds and other engineered structures to remove metallic pollutants, and leaching behavior is related to particle size. In this investigation, water borne soil particles were leached and fractionated with a split-flow thin cell, and the metal loadings were quantified as a function of particle size. For comparison of the metal-loading curves, different empirical modeling procedures were investigated to convert the data to a precise functional form suitable for quantitative comparison of changes in differential loading as a function of particle size.

Examples of the role of analytical chemistry in environmental risk management research.

Analytical chemistry is an important tier of environmental protection and has been traditionally linked to compliance and/or exposure monitoring activities for environmental contaminants. The adoption of the risk management paradigm has led to special challenges for analytical chemistry applied to environmental risk analysis. Namely, methods developed for regulated contaminants may not be appropriate and/or applicable to risk management scenarios.

Trace metal loading on water-borne soil and dust particles characterized through the use of split-flow thin-cell fractionation.

The fate and transport of metallic pollutants through a watershed are related to the characteristics of undissolved solid particles to which they are bound. Removal of these particles and their associated pollutants via engineered structures such as settling ponds is one goal of stormwater management. Because the particles most often implicated in metal pollution have nominal diameters of <50 microm, Split-flow thin-cell (SPLITT) fractionation was investigated to study the metal loading as a function of particle settling rate.

Adverse male reproductive effects following subchronic exposure of rats to sodium dichloroacetate.

Dichloroacetate (DCA) activates the pyruvate dehydrogenase complex enhancing carbohydrate and lactate utilization in animals. As a result it is used clinically in the treatment of acute lactic acidosis and has therapeutic potential in the treatment of stroke. Adverse effects of chronic DCA treatment include polyneuropathy and testicular degeneration.