Browsing by Author "Fan, Zhihua (Tina)"

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    Development and Optimization of a Sampling and Analytical Method to Measure Hexavalent Chromium in Ambient Air
    (Trenton, N.J. : New Jersey Department of Environmental Protection, 2009-10-07) Fan, Zhihua (Tina); Lin, Lin; Huang, LiHui; Yu, Chang Ho; Buckley, Brian; Bollen, Brad; Bonanno, Linda
    The overall goal of this study was to develop a sensitive and reliable method for the measurement of ambient airborne Cr(VI) by systematically evaluating and optimizing the sampling, sample processing and analytical processes. This method can also simultaneously quantify the inter-conversion rates between Cr(VI) and Cr(III) and the recovery rate of Cr(VI).
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    The Distribution of Chromium Species as a Function of Particle Size for Chromium Waste Laden Soils: Research Project Summary
    (Trenton, N.J. : New Jersey Department of Environmental Protection, Division of Science, Research and Technology: Research Project Summary, 2008-11) Lin, Lin; Fan, Zhihua (Tina); Lioy, Paul J.; Stern, Alan H.
    Among the remediation criteria applied to COPR in Hudson County, New Jersey are those based on the cancer risk associated with inhalation of Cr+6. For inhalation-based remediation criteria, the acceptable soil concentration is based on the concentration of Cr+6 on the respirable size particles. The default assumption is that the concentration of Cr+6 on those particles is the same as the concentration in the bulk COPR soil material. To examine this assumption COPR soil from 8 locations was separated into size fractions. The concentration of Cr+6, total Cr and Cr+3 was compared in the bulk soil and the individual size fractions including the respirable (<2.5 μm) material. Cr+6 was consistently enriched in the 2.5 μm fraction compared to the bulk COPR soil (mean enrichment = 63.7). In addition, the Cr+6 accounted for a larger percentage of the total Cr as the particle size decreased. In contrast total Cr and Cr+3 did not show a consistent enrichment in the 2.5 μm fraction. There was a strong relationship between Cr+6 concentration in the bulk material and in the 2.5 μm fraction that may allow analysis of Cr+6 in bulk COPR soil to be used as a surrogate analysis of the 2.5 μm fraction.