Chemical Structure of Arsenic and Chromium in CCA-Treated Wood:  Implications of Environmental Weathering

Nico, Peter; Fendorf, Scott; Lowney, Yvette W.; Holm, Stewart E.; Ruby, Michael V.

doi:10.1021/es0351342

Cited by 69 publications

(57 citation statements)

References 27 publications

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“…Another advantage of using XANES to measure Cr oxidation state is that the octahedrally coordinated Cr(VI) has a distinct pre-edge peak in the Cr spectrum that is nearly independent of the presence of the tetrahedrally coordinated Cr(III). Although XANES has not been previously used to determine metal oxidation states in atmospheric particles, it has been used to quantify Cr(VI) in coal (Huggins et al 1999), on rice husks (Hu et al 2004), and on treated wood (Nico et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of Simulated Atmospheric Transformations of Chromium in Ultrafine Combustion Aerosol Particles

Werner

Nico

Guo

et al. 2006

Aerosol Science and Technology

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While atmospheric particles can have adverse health effects, the reasons for this toxicity are largely unclear. One possible reason is that the particles can contain toxic metals such as chromium. Chromium exists in the environment in two major oxidation states: III, which is an essential nutrient, and VI, which is highly toxic and carcinogenic. Currently little is known about the speciation of chromium in airborne particles or how this speciation is altered by atmospheric reactions. To investigate the potential impacts of atmospheric aging on the speciation and toxicity of chromiumcontaining particles, we collected chromium and chromium-iron combustion ultrafine particles on Teflon filters and exposed the particles to a combination of light, ozone, water vapor, and, in We thank Dr. Matthew Newville of the GSECARS at the Advanced Photon Source (APS), Argonne National Laboratory, for his assistance. The majority to the X-ray data presented above were collected at GeoSoilEnviroCARS (Sector 13), which is supported by the National Science Foundation-Earth Sciences (EAR-0217473), Department of Energy-Geosciences (DE-FG02-94ER14466) and the State of Illinois. Use of the APS was supported by the U.S. Department of Energy under Contract No. W-31-109-Eng-38. We would also like to thank Dr. Matthew Marcus of beamline 10.3.2 of the Advanced Light Source (Lawrence Berkeley National Laboratory), which is supported by the US Department of Energy (DE-AC02-05CH11231). Portions of this research were also carried out at the Stanford Synchrotron Radiation Laboratory, operated by Stanford University on behalf of the U.S. Department of Energy. Finally, we thank David Paige (Paige Instruments) for constructing the ozone generator, John Newberg and Mike JimenezCruz for building the ozone dilution and delivery system, and Michelle Gras of the UC Davis Interdisciplinary Center for Plasma Mass Spectrometry for conducting the ICP-MS analyses. This work was supported by grant number 5 P42 ES04699 from the National Institute of Environmental Health Sciences (NIEHS) of the NIH, and by a fellowship from the UC Davis NEAT-IGERT program to Michelle Werner (NSF IGERT Grant # 9972741). Partial support was also provided by the U.S. Department of Energy under contract number DE-AC02-05CH11231. The contents of this paper are solely the responsibility of the authors and do not necessarily represent the official views of the NIEHS, NIH.Address correspondence to Cort Anastasio, One Shields Avenue, Department of Land, Air & Water Resources, University of California, Davis, CA 95616. E-mail: canastasio@ucdavis.edu some cases, basic or acidic conditions. After the aging process, the aged and not-aged samples were analyzed for Cr oxidation state using X-ray Absorption Near Edge Spectroscopy (XANES). We found that the aging process reduced Cr(VI) by as much as 20% in chromium particles that had high initial Cr(VI)/Cr(total) ratios. This reduction of Cr(VI) to Cr(III) appears to be due to reactions primarily with light and hydroperoxyl radical (HO 2 ) in the...

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Section: Introductionmentioning

confidence: 99%

Laboratory Study of Simulated Atmospheric Transformations of Chromium in Ultrafine Combustion Aerosol Particles

Werner

Nico

Guo

et al. 2006

Aerosol Science and Technology

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“…Nico et al (2004) observed that the chemical and structural forms of either Cr or As in the exposed wood are the same as in freshly treated material; for example, they characterized mainly As(V) and Cr(III) species, arranged in persistent clusters that can resist to ageing and extraction. Moreover, the leaching of dislodgeabled residues of such CCA-preserved wood with simulated biological fluids (sweat or gastric juice) indicated the main presence of free As(V) anionic species (Nico et al 2006); however the dermal absorption of As from such CCA-treated wood seemed without health concerns.…”

Section: Fate Of As Compounds Coming From Human Activitiesmentioning

confidence: 97%

“…However, man produces an additional impact on the environment through gold mining, combustion of fossil fuels and the use of arsenical pesticides and herbicides (Smedley and Kinniburgh 2002), or of additives to livestock feed . Although the use of arsenic-containing products such as pesticides and herbicides has decreased significantly in the last few decades, their use for wood preservation is still common (Nico et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Arsenic in drinking water: sources, occurrence and health effects (a review)

Villaescusa

Bollinger

2008

Rev Environ Sci Biotechnol

122

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Because dramatic cases of arsenic contamination of water resources, soils, vegetables, humans and animals increase, this review has focussed on the fate and behaviour of this element and what kind of health impacts are related with its release in surface or ground waters. In a first part, we point out how the primary minerals can lead to As mobilization and exportation by surface waters and suspended matter. We also emphasize the particular key role for As retention through both adsorption onto natural Fe(III) (hydr)oxides, Mn oxides and/or precipitation as Fe(III) arsenates. Nowadays, numerous and efficient systems for arsenic removal from any natural resources are available to produce good quality drinking water (with \10 lg/l As); however it is not within the scope of the present review. In a second part we focus on recent knowledge about the human toxicity of the various arsenic species. Chronic exposure to As in drinking water lead to many health diseases and, although the mechanisms of toxification/detoxification are not well identified, the role of methylated species is discussed. Some epidemiologic studies are cited, but the exact relationship between past chronic As exposure and present health diseases has been questioned.

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“…Typically, 1 m 3 of CCA-treated wood contains about 1.41 kg of As(V) (Morrell and Huffman, 2004), 120. After treatment, the As(V) probably exists as CrAsO 4 (Nico et al, 2004), 5253. However, once the wood is exposed to the elements or burned, the arsenic could partially reduce to more toxic and mobile As(III) (Helsen and Van den Bulck, 2004), 286; (Khan et al, 2004).…”

Section: Wood Treatmentmentioning

confidence: 99%