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Titolo:
Elemental analyses of goundwater: demonstrated advantage of low-flow sampling and trace-metal clean techniques over standard techniques
Autore:
Creasey, CL; Flegal, AR;
Indirizzi:
Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA Univ CalifSanta Cruz Santa Cruz CA USA 95064 i, Santa Cruz, CA 95064 USA
Titolo Testata:
HYDROGEOLOGY JOURNAL
fascicolo: 2, volume: 7, anno: 1999,
pagine: 161 - 167
SICI:
1431-2174(199904)7:2<161:EAOGDA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SAN-FRANCISCO BAY; GROUND-WATER; LEAD; FLUXES; CALIFORNIA; ARTIFACTS; TRENDS; RIVERS; USA;
Keywords:
contamination; field techniques; trace metals; groundwater monitoring; USA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Creasey, CL Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA Univ Calif Santa Cruz Santa Cruz CA USA 95064 z, CA 95064 USA
Citazione:
C.L. Creasey e A.R. Flegal, "Elemental analyses of goundwater: demonstrated advantage of low-flow sampling and trace-metal clean techniques over standard techniques", HYDROGEOL J, 7(2), 1999, pp. 161-167

Abstract

The combined use of both (1) low-flow purging and sampling and (2) trace-metal clean techniques provides more representative measurements of trace-element concentrations in groundwater than results derived with standard techniques. The use of low-flow purging and sampling provides relatively undisturbed groundwater samples that are more representative of in situ conditions, and the use of trace-element clean techniques limits the inadvertent introduction of contaminants during sampling, storage, and analysis. When these techniques are applied, resultant trace-element concentrations are likelyto be markedly lower than results based on standard sampling techniques. In a comparison of data derived from contaminated and control groundwater wells at a site in California, USA, trace-element concentrations from this study were 2-1000 times lower than those determined by the conventional techniques used in sampling of the same wells prior to (5 months) and subsequentto (1 month) the collections for this study. Specifically, the cadmium andchromium concentrations derived using standard sampling techniques exceed the California Maximum Contaminant Levels (MCL), whereas in this investigation concentrations of both of those elements are substantially below their MCLs. Consequently, the combined use of low-flow and trace-metal clean techniques may preclude erroneous reports of trace-element contamination in groundwater.

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Documento generato il 30/10/20 alle ore 09:55:47