BIOAVAILABILITY OF FRESHLY ADDED AND AGED NAPHTHALENE IN SOILS UNDER GASTRIC pH CONDITIONS
1999; Wiley; Volume: 18; Issue: 12 Linguagem: Inglês
10.1897/1551-5028(1999)018 2.3.co;2
ISSN1552-8618
AutoresZhaowei Jin, Stephen Simkins, Baoshan Xing,
Tópico(s)Pharmaceutical and Antibiotic Environmental Impacts
ResumoEnvironmental Toxicology and ChemistryVolume 18, Issue 12 p. 2751-2758 Environmental Chemistry Bioavailability of freshly added and aged naphthalene in soils under gastric pH conditions Zhaowei Jin, Zhaowei Jin Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USASearch for more papers by this authorStephen Simkins, Stephen Simkins Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USASearch for more papers by this authorBaoshan Xing, Corresponding Author Baoshan Xing [email protected] Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USADepartment of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USASearch for more papers by this author Zhaowei Jin, Zhaowei Jin Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USASearch for more papers by this authorStephen Simkins, Stephen Simkins Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USASearch for more papers by this authorBaoshan Xing, Corresponding Author Baoshan Xing [email protected] Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USADepartment of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts 01003, USASearch for more papers by this author First published: 02 November 2009 https://doi.org/10.1002/etc.5620181215Citations: 17Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The bioavailability of hydrophobic organic chemicals decreases with aging in soil because of sequestration. However, assessments of the risk of exposure to contaminated soils are usually dependent on either chemical concentrations, which are measured using vigorous extraction methods, or models that assume an equilibrium without considering the actual conditions. The objective of this research was to determine the availability and desorption kinetics of freshly added and aged naphthalene from a peat and a mineral soil; naphthalene was desorbed into solutions with pH levels that approximate those found in different gastric regions. Soil and peat samples were spiked with radiolabeled and unlabeled naphthalene at 2 and 20 μg/g and were aged from 0 to 135 d. Desorption kinetics were determined using a simulated stomach solution (0.1 M NaCl, 0.1 M HCl, 0.01 M NH4Ac, pH = 1.0) and a neutral solution (0.2 M NaCl, pH = 6.7) that represented the pH of intestinal conditions and most soils. Peat sorbed much more naphthalene than did soil, and it allowed little desorption. Though both acidic and neutral extracting solutions could desorb naphthalene, little apparent effect of aging was observed in peat, whereas desorption from soil declined markedly with aging. In addition, the percentage of naphthalene that desorbed from soil was greater for the higher incubation concentration. The desorption of naphthalene from the peat and soil was higher into the neutral solution than into the gastric solution. These results suggest that aging, exposure conditions, concentration effect, and organic matter content should be taken into account in predictive models and risk assessments. REFERENCES 1 Hatzinger PB, Alexander M. 1995. 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