Lin, LinFan, Zhihua (Tina)Lioy, Paul J.Stern, Alan H.2020-11-232020-11-232008-11https://hdl.handle.net/10929/68682Prepared by UMDNJ-Robert Wood Johnson Medical School and Environmental and Occupational Health Sciences Institute and NJDEP, Division of Science, Research and TechnologyAmong 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.en-USNew JerseyNew Jersey - Hudson CountyArticle