ENVR 30 |
| Israel Razo, Jesús Téllez, Leticia Carrizales, Javier Castro, Fernando Díaz-Barriga, and Marcos Monroy. |
| Elevated concentrations of arsenic (19-17,800 µg/g) have been reported in soil from a mining site in the state of San Luis Potosí, Mexico, which are mainly associated to mining and metallurgical activities and non-controlled wastes deposits. High levels of urinary arsenic reported in children living in the site (8-323 µg/g creatinine) have been mainly related to contaminated soil ingestion. Thus, soil remediation is considered an important stage for a risk reduction program. Nevertheless, because of the extension of contaminated areas and the different soil uses, a risk-based cleaning level was considered to drive a soil remediation program, where the arsenic bioavailability issue is addressed. This work aims to assess arsenic in vitro bioavailability for both mining and metallurgical sources. Results indicate that arsenic bioaccessibility in the mining area soil is relatively low (1.4-32.1%, mean=10.3%), while soil from the metallurgical area is higher (11.4-94.4%, mean=44.8%). Differences in bioaccessibility are explained by speciation of the arsenic-bearing solid phases. |
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Occurrence, Chemistry, Toxicity and Remediation of Arsenic
1:30 PM-4:50 PM, Sunday, 26 March 2006 Georgia World Congress Center -- B218, Oral
Division of Environmental Chemistry |