Urban legacies and soil management affect the concentration and speciation of trace metals in Los Angeles community garden soils.
Identifieur interne : 000241 ( Main/Exploration ); précédent : 000240; suivant : 000242Urban legacies and soil management affect the concentration and speciation of trace metals in Los Angeles community garden soils.
Auteurs : Lorraine Weller Clarke [États-Unis] ; G Darrel Jenerette [États-Unis] ; Daniel J. Bain [États-Unis]Source :
- Environmental pollution (Barking, Essex : 1987) [ 1873-6424 ] ; 2015.
Descripteurs français
- KwdFr :
- MESH :
- analyse : Métaux lourds, Polluants du sol.
- métabolisme : Produits agricoles.
- Biodisponibilité, Emissions des véhicules, Jardinage, Los Angeles, Sol, Surveillance de l'environnement.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Metals, Heavy, Soil Pollutants.
- chemical , chemistry : Soil.
- geographic : Los Angeles, Vehicle Emissions.
- metabolism : Crops, Agricultural.
- Biological Availability, Environmental Monitoring, Gardening.
Abstract
Heavy metals in urban soils can compromise human health, especially in urban gardens, where gardeners may ingest contaminated dust or crops. To identify patterns of urban garden metal contamination, we measured concentrations and bioavailability of Pb, As, and Cd in soils associated with twelve community gardens in Los Angeles County, CA. This included sequential extractions to partition metals among exchangeable, reducible, organic, or residual fractions. Proximity to road increased all metal concentrations, suggesting vehicle emissions sources. Reducible Pb increased with neighborhood age, suggesting leaded paint as a likely pollutant source. Exchangeable Cd and As both increased with road proximity. Only cultivated soils showed an increase in exchangeable As with road proximity, potentially due to reducing humic acid interactions while Cd bioavailability was mitigated by organic matter. Understanding the geochemical phases and metal bioavailability allows incorporation of contamination patterns into urban planning.
DOI: 10.1016/j.envpol.2014.11.015
PubMed: 25437835
Affiliations:
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To identify patterns of urban garden metal contamination, we measured concentrations and bioavailability of Pb, As, and Cd in soils associated with twelve community gardens in Los Angeles County, CA. This included sequential extractions to partition metals among exchangeable, reducible, organic, or residual fractions. Proximity to road increased all metal concentrations, suggesting vehicle emissions sources. Reducible Pb increased with neighborhood age, suggesting leaded paint as a likely pollutant source. Exchangeable Cd and As both increased with road proximity. Only cultivated soils showed an increase in exchangeable As with road proximity, potentially due to reducing humic acid interactions while Cd bioavailability was mitigated by organic matter. Understanding the geochemical phases and metal bioavailability allows incorporation of contamination patterns into urban planning.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Californie</li><li>Pennsylvanie</li></region><settlement><li>Pittsburgh</li></settlement><orgName><li>Université de Pittsburgh</li></orgName></list><tree><country name="États-Unis"><region name="Californie"><name sortKey="Clarke, Lorraine Weller" sort="Clarke, Lorraine Weller" uniqKey="Clarke L" first="Lorraine Weller" last="Clarke">Lorraine Weller Clarke</name></region><name sortKey="Bain, Daniel J" sort="Bain, Daniel J" uniqKey="Bain D" first="Daniel J" last="Bain">Daniel J. Bain</name><name sortKey="Jenerette, G Darrel" sort="Jenerette, G Darrel" uniqKey="Jenerette G" first="G Darrel" last="Jenerette">G Darrel Jenerette</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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