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Your search keyword '"Kah, Melanie"' showing total 10 results
Start Over Author "Kah, Melanie" Journal environmental science & technology
10 results on '"Kah, Melanie"'

1. International Analysis of Sources and Human Health Risk Associated with Trace Metal Contaminants in Residential Indoor Dust

Author

Isley, Cynthia Faye, primary, Fry, Kara L., additional, Liu, Xiaochi, additional, Filippelli, Gabriel Michael, additional, Entwistle, Jane A., additional, Martin, Adam P., additional, Kah, Melanie, additional, Meza-Figueroa, Diana, additional, Shukle, John T., additional, Jabeen, Khadija, additional, Famuyiwa, Abimbola O., additional, Wu, Liqin, additional, Sharifi-Soltani, Neda, additional, Doyi, Israel N. Y., additional, Argyraki, Ariadne, additional, Ho, Kin Fai, additional, Dong, Chenyin, additional, Gunkel-Grillon, Peggy, additional, Aelion, C. Marjorie, additional, and Taylor, Mark Patrick, additional

Published
2021
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2. International Analysis of Sources and Human Health Risk Associated with Trace Metal Contaminants in Residential Indoor Dust.

Author

Faye Isley, Cynthia, Fry, Kara L., Xiaochi Liu, Michael Filippelli, Gabriel, Entwistle, Jane A., Martin, Adam P., Kah, Melanie, Meza-Figueroa, Diana, Shukle, John T., Jabeen, Khadija, Famuyiwa, Abimbola O., Liqin Wu, Sharifi-Soltani, Neda, Doyi, Israel N. Y., Argyraki, Ariadne, Kin Fai Ho, Chenyin Dong, Gunkel-Grillon, Peggy, Marjorie Aelion, C., and Patrick Taylor, Mark

Published
2022
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3. International Analysis of Sources and Human Health Risk Associated with Trace Metal Contaminants in Residential Indoor Dust

Author

Isley, Cynthia Faye, Fry, Kara L., Liu, Xiaochi, Filippelli, Gabriel Michael, Entwistle, Jane A., Martin, Adam P., Kah, Melanie, Meza-Figueroa, Diana, Shukle, John T., Jabeen, Khadija, Famuyiwa, Abimbola O., Wu, Liqin, Sharifi-Soltani, Neda, Doyi, Israel N. Y., Argyraki, Ariadne, Ho, Kin Fai, Dong, Chenyin, Gunkel-Grillon, Peggy, Aelion, C. Marjorie, and Taylor, Mark Patrick

Abstract

People spend increasing amounts of time at home, yet the indoor home environment remains understudied in terms of potential exposure to toxic trace metals. We evaluated trace metal (and metalloid) concentrations (As, Cu, Cr, Mn, Ni, Pb, and Zn) and health risks in indoor dust from homes from 35 countries, along with a suite of potentially contributory residential characteristics. The objective was to determine trace metal source inputs and home environment conditions associated with increasing exposure risk across a range of international communities. For all countries, enrichments compared to global crustal values were Zn > Pb > Cu > As > Cr > Ni; with the greatest health risk from Cr, followed by As > Pb > Mn > Cu > Ni > Zn. Three main indoor dust sources were identified, with a Pb–Zn–As factor related to legacy Pb sources, a Zn–Cu factor reflecting building materials, and a Mn factor indicative of natural soil sources. Increasing home age was associated with greater Pb and As concentrations (5.0 and 0.48 mg/kg per year of home age, respectively), as were peeling paint and garden access. Therefore, these factors form important considerations for the development of evidence-based management strategies to reduce potential risks posed by indoor house dust. Recent findings indicate neurocognitive effects from low concentrations of metal exposures; hence, an understanding of the home exposome is vital.

Published
2022
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10. Dispersion State and Humic Acids Concentration-Dependent Sorption of Pyrene to Carbon Nanotubes.

Author

Xiaoran Zhang, Kah, Melanie, Jonker, Michiel T. O., and Hofmann, Thilo

Subjects
*SONICATION, *HUMIC acid, *DISPERSION (Chemistry), *CARBON nanotubes, *SORPTION, *PYRENE
Abstract

Sonication and humic acids (HA) are known to disperse carbon nanotube (CNT) suspensions, but potential effects on sorption of chemicals to CNTs remain poorly understood. We applied a passive sampling method to investigate the influence of dispersion/aggregation on sorption of pyrene to CNTs. Sonication broke down CNT aggregates and increased pyrene sorption affinity by up to 1.39 orders of magnitude. Sorption surfaces newly exposed by sonication remained available to pyrene even after reaggregation occurred, suggesting an irreversible effect of sonication. The presence of HA decreased sorption of pyrene to CNTs, but at the highest HA concentration investigated (200 mg/L), sorption affinity was still 1.90 orders of magnitude larger than sorption of pyrene to HA alone. Specific interactions between pyrene and CNTs were thus still taking place, in spite of the presence of a HA coating on the CNTs' surface. A greater suppression of sorption by CNTs occurred when the HA addition was combined with a sonication pretreatment. Sorption isotherm fitting indicated that the maximum sorption capacity, sorption affinity, and heterogeneity of the CNT surface were all affected by sonication and the presence of HA at a concentration as low as 1 mg/L. The present results contribute to an improved understanding of the sorption behavior of CNTs in both natural and wastewater systems. [ABSTRACT FROM AUTHOR]

Published
2012
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