Dan I. Kaplan

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Uncultivated plants growing on disturbed sites may be useful for assessing the bioavailability of some metals in soils, and thus the potential for metal mobilization up the terrestrial food chain, an important element in ecological risk assessment. A planted chicory cultivar (Cichorium intybus L. var. foliosum Hegi.) and the uncultivated plants horseweed(More)
Page 1 of 23 Mercury Geochemistry in a Wetland and its Implications for In-situ Remediation 12/24/2008 http://sti.srs.gov/fulltext/ms2002056/ms2002056.html The objective of this study was to characterize the nature of Hg sorption on a wetland sediment with the intent of providing guidance for the selection of an appropriate in-situ remediation strategy.(More)
It has become increasingly evident that mobile colloids may be a primary vector for transporting contaminants in subsurface environments (1) . A difficulty with studying and modeling this contaminant transport process has been in defining clearly whether the contaminants exist in the mobile-solid (colloidal) or mobile-aqueous phase. Traditionally,(More)
Phosphate minerals and specifically apatite show promise for environmental cleanup because they can form stable compounds with a wide range of cationic contaminants. However, phosphate minerals naturally accumulate some heavy metals that may cause additional contamination of the environment if used improperly. Nine commercially available phosphate materials(More)
The use of sequestering agents for the transformation of radionuclides in low concentrations in contaminated soils/sediments offers considerable potential for environmental cleanup. This study evaluated the influence of three types of phosphate (rock phosphate, biological phosphate, and calcium phytate) and two microbial amendments (Alcaligenes piechaudii(More)
Laboratory and greenhouse studies were conducted to quantify apatite and phillipsite (zeolite) sequestration of selected metal contaminants. The laboratory batch study measured the sorption of aqueous Co2+, Ba2+, Pb2+, Eu3+, and UO2(2+). Apatite sorbed more Co2+, Pb2+, Eu3+, and UO2(2+) from the spike solution than phillipsite, resulting in distribution(More)