Geochemical heterogeneity in a sand and gravel aquifer: Effect of sediment mineralogy and particle size on the sorption of chlorobenzenes

Negative correlation between porosity and hydraulic conductivity in sand-and-gravel aquifers at Cape Cod, Massachusetts, USA

“…Clays tend to accumulate radioisotopes through adsorption and ion-exchange processes, and zones of high gamma activity detected by a logging probe are typically interpreted as being clay rich. However, in the granular deposits of Cape Cod where clays are virtually absent (Barber et al, 1992), intervals exhibiting high gamma activity more often correspond to coarse and immature glauconitic sands.…”

Mineral dissolution in the Cape Cod aquifer, Massachusetts, USA: I . Reaction stoichiometry and impact of accessory feldspar and glauconite on strontium isotopes, solute concentrations, and REY distribution 1 1Associate Editor: L. M. Walter

“…The Cape Cod aquifer sediments have been meticulously investigated by many authors in the past (e.g., Barber, 1985;Barber et al, 1992;Coston et al, 1995;DeSimone et al, 1997) and hence, we did not re-do this extensive analysis.…”

“…Such unconsolidated glacial aquifers are widespread and of great importance, because water supplies for many metropolitan areas are derived from such aquifers. In addition, the groundwater flow, the groundwater chemistry, and also the sediment mineralogy at Cape Cod have been thoroughly and extensively investigated (e.g., Barber, 1985;LeBlanc et al, 1991;Barber et al, 1992;Coston et al, 1995;Masterson et al, 1996;DeSimone et al, 1997;Savoie and LeBlanc, 1998;Yau, 1999, Shapiro et al, 1999and references therein). This site represents a relatively simple aquifer -a best case aquifer wherein analysis of mineral dissolution was anticipated to be unequivocal and where the hydrology was well-understood.…”

“…Specifically, it was anticipated that, since the aquifer is sand and gravel consisting of 95% (wt.) quartz and feldspar (Barber et al, 1992;Coston et al, 1995), and less than 1% silt and clay and less than 0.1% organic carbon (Barber et al, 1992), dissolution reactions could be easily interpreted.…”

Sorptionsverhalten organischer Schadstoffe in heterogenem Aquifermaterial am Beispiel des Phenanthrens

“…BALL & ROBERTS (1991a) in Versuchen mit Perchlorethen und Tetrachlorbenzol verschiedene Sorptionskoeffizienten für die verschiedenen Korngrößenfraktionen eines Sedimentes. Untersuchungen von BARBER et al (1992) zeigten, daß die magnetische Fraktion eines Sandes eine dreifach höhere Sorption von Chlorbenzolen als, die nichtmagnetische Fraktion ergab. WEBER et al (1992) berichteten, daß die Schiefertonfraktion einer Bodenprobe bezüglich Trichlorbenzol eine deutlich höhere Sorption als die Gesamtprobe aufwies.…”