| Abstract: | Several geochemical properties of an aquifer sediment that control metal-ion adsorption were investigated to determine their potential use as indicators of the spatial variability of metal adsorption. Over the length of a 4.5-m-long core from a sand and gravel aquifer, lead (Pb2+) and zinc (Zn2+) adsorption at constant chemical conditions (pH 5.3) varied by a factor of 2 and 4, respectively. Pb2+ and Zn2+ were adsorbed primarily by Fe- and Al-oxide coatings on quartz-grain surfaces. Per unit surface area, both Pb2+ and Zn2+ adsorption were significantly correlated with the amount of Fe and Al that dissolved from the aquifer material in a partial chemical extraction. The variability in conditional binding constants for Pb2+ and Zn2+ adsorption (log KADS) derived from a simple non-electrostatic surface complexation model were also predicted by extracted Fe and Al normalized to surface area. Because the abundance of Fe- and Al-oxide coatings that dominate adsorption does not vary inversely with grain size by a simple linear relationship, only a weak, negative correlation was found between the spatial variability of Pb2+ adsorption and grain size in this aquifer. The correlation between Zn2+ adsorption and grain size was not significant. Partial chemical extractions combined with surface-area measurements have potential use for estimating metal adsorption variability in other sand and gravel aquifers of negligible carbonate and organic carbon content. |
| Genre: | Article |
| ProdID: | 70018477 |
| Citation Author: | Fuller, C. C.; Davis, J. A.; Coston, J. A.; Dixon, E. |
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| Citation End Page: | 187 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Contaminant Hydrology |
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| Citation Number Of Pages: | 23 |
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| Citation Search Results Text: | Characterization of metal adsorption variability in a sand and gravel aquifer, Cape Cod, Massachusetts, U.S.A; 1996; Article; Journal; Journal of Contaminant Hydrology; Fuller, C. C.; Davis, J. A.; Coston, J. A.; Dixon, E. |
| Citation Start Page: | 165 |
| Citation Volume: | 22 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Characterization of metal adsorption variability in a sand and gravel aquifer, Cape Cod, Massachusetts, U.S.A; 1996; Article; Journal; Journal of Contaminant Hydrology; Fuller, C. C.; Davis, J. A.; Coston, J. A.; Dixon, E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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