Environ. Sci. Technol. 2005, 39, 3571-3579
Arsenate Adsorption Structures on Aluminum Oxide and Phyllosilicate Mineral Surfaces in Smelter-Impacted Soils BRETT T. BEAULIEU AND KAYE S. SAVAGE* Department of Earth and Environmental Sciences, Station B 351705, Vanderbilt University, Nashville, Tennessee 37235
A clearer understanding of arsenic (As) retention and transport in forest soils impacted by copper smelter emissions may reduce risks to human health and provide insight into As behavior in the vadose zone. On Vashon-Maury Island in Puget Sound, As is predominantly associated with the fine (2 mm), sand (e 2 mm, > 63 µm), and fines (e 63 µm) were measured using a dry plastic sieve method to avoid immersion of limited sample quantity. Except where noted, fine fraction soil was the subject of analytical measurements. Percentage of soil organic matter (SOM) in the fine fraction was estimated using a loss on ignition (LOI) method (28). Mineralogy of five samples selected to represent the common brown fine sand and silt (column J), the anomalous clay-rich gray soil (column F), and Maury Island (K) was determined with X-ray diffraction (XRD; Cu KR). Oriented subsamples from the
