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Arsenic Background Concentrations in Florida, U.S.A. Surface Soils: Determination and Interpretation

Identifieur interne : 000B51 ( Istex/Corpus ); précédent : 000B50; suivant : 000B52

Arsenic Background Concentrations in Florida, U.S.A. Surface Soils: Determination and Interpretation

Auteurs : Ming Chen ; Lena Q. Ma ; C. G. Hoogeweg ; W. G. Harris

Source :

RBID : ISTEX:FA64602FC8CD7071A9775C03CECF0528132F7788

English descriptors

Abstract

Background concentrations of soil arsenic have been used as an alternative soil cleanup criterion in many states in the U.S. This research addresses issues related to the interpretation of background concentrations of arsenic in near pristine soils in Florida. Total arsenic was measured in 448 taxonomic and geographic representative surface soil samples using USEPA Method 3052 (HCl-HNO3-HF, microwave digestion) and graphite furnace atomic absorption spectrophotometry analysis procedure. Values were log-normally distributed, with geometric mean and baseline concentration (defined as 95% of the expected range of background concentrations) providing the most satisfactory statistical results. An upper baseline concentration of 6.21mg As/kg was estimated for undisturbed soils (n=267) compared to 7.63mg As/kg for disturbed soils (n=181). Temporal trend of total soil arsenic concentrations from 1967 to 1989 paralleled decreased usage of arsenic in U.S. agriculture. Soil arsenic background concentrations were generally higher in south Florida than in north and central Florida, and associated with wet soils. Individual high arsenic sites were scattered throughout the state, but the most highly concentrated of these occurred in the Leon-Lee belt along the Ocala uplift district extending to the southwestern flatwoods district. Extrapolation of the data using a single arsenic value regardless of the taxonomic and geographical differences in soil arsenic distribution would underestimate potential arsenic contamination in upland soils.

Url:
DOI: 10.1006/enfo.2001.0050

Links to Exploration step

ISTEX:FA64602FC8CD7071A9775C03CECF0528132F7788

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<abstract lang="en">Background concentrations of soil arsenic have been used as an alternative soil cleanup criterion in many states in the U.S. This research addresses issues related to the interpretation of background concentrations of arsenic in near pristine soils in Florida. Total arsenic was measured in 448 taxonomic and geographic representative surface soil samples using USEPA Method 3052 (HCl-HNO3-HF, microwave digestion) and graphite furnace atomic absorption spectrophotometry analysis procedure. Values were log-normally distributed, with geometric mean and baseline concentration (defined as 95% of the expected range of background concentrations) providing the most satisfactory statistical results. An upper baseline concentration of 6.21mg As/kg was estimated for undisturbed soils (n=267) compared to 7.63mg As/kg for disturbed soils (n=181). Temporal trend of total soil arsenic concentrations from 1967 to 1989 paralleled decreased usage of arsenic in U.S. agriculture. Soil arsenic background concentrations were generally higher in south Florida than in north and central Florida, and associated with wet soils. Individual high arsenic sites were scattered throughout the state, but the most highly concentrated of these occurred in the Leon-Lee belt along the Ocala uplift district extending to the southwestern flatwoods district. Extrapolation of the data using a single arsenic value regardless of the taxonomic and geographical differences in soil arsenic distribution would underestimate potential arsenic contamination in upland soils.</abstract>
<note type="content">Section title: Regular Article</note>
<subject lang="en">
<genre>Keywords</genre>
<topic>arsenic, background concentration, baseline concentration, soils, geographic distribution, temporal distribution.</topic>
</subject>
<relatedItem type="host">
<titleInfo>
<title>Environmental Forensics</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>YENFO</title>
</titleInfo>
<genre type="journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">200106</dateIssued>
</originInfo>
<identifier type="ISSN">1527-5922</identifier>
<identifier type="PII">S1527-5922(00)X0002-X</identifier>
<part>
<date>200106</date>
<detail type="volume">
<number>2</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>2</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>113</start>
<end>175</end>
</extent>
<extent unit="pages">
<start>117</start>
<end>126</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">FA64602FC8CD7071A9775C03CECF0528132F7788</identifier>
<identifier type="DOI">10.1006/enfo.2001.0050</identifier>
<identifier type="PII">S1527-5922(01)90050-3</identifier>
<accessCondition type="use and reproduction" contentType="copyright">©2001 Association for Environmental Health and Sciences</accessCondition>
<recordInfo>
<recordContentSource>ELSEVIER</recordContentSource>
<recordOrigin>Association for Environmental Health and Sciences, ©2001</recordOrigin>
</recordInfo>
</mods>
</metadata>
<serie></serie>
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