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DIVISION S-2-SOIL CHEMISTRY

Arsenic Sorption in Phosphate-Amended Soils during Flooding and Subsequent Aeration

^a Dep. of Agronomy, Pennsylvania State Univ., University Park, PA 16802 USA
^b Division of Soil Science, Univ. of Idaho, Moscow, ID 83844-2339 USA
^c Geological and Environmental Sciences, Stanford Univ., Palo Alto, CA 94305 USA

jgr6{at}psu.edu

Phosphate enhances the mobility of As in well-aerated soils by competing for adsorption sites. Phosphate and As may also coexist in large concentrations in hydric soils, and the influence of P on As in anaerobic systems is largely unknown. To determine the effects of P on As dynamics during a soil flooding and aeration cycle, samples of two soils were amended with Na₂HAsO₄ and Na₂HPO₄ and incubated under a N₂ atmosphere for 41 d, and then reaerated for 7 d. Subsamples were collected intermittently and dissolved As, Fe, Mn, Ca, S, P, and H₃AsO₃ concentrations were determined. Arsenic speciation in the soil solids was determined after 14 and 41 d of flooding and then after 13 h of aeration by X-ray absorption near edge structure (XANES) spectroscopy. Arsenic sorption was small under anaerobic conditions, and H₂PO^-₄ additions enhanced As(V) reduction rate in both soils and slightly suppressed As sorption in one soil. Arsenopyrite (FeAsS) was identified in the soil solids. Rapid and simultaneous As sorption and Fe precipitation occurred during the first 0.25 d of aeration, suggesting that As was retained on freshly precipitated Fe (hydr)oxides. Manganese precipitation and concomitant As sorption occurred after 1 d of aeration. Arsenopyrite was largely destroyed upon aeration but As(III) persisted. Thus, As is partitioned into the solid phase under both aerobic and anaerobic conditions, although more appreciably under the aerobic conditions of this study, and P has little influence on dissolved As during soil flooding–aeration cycles.

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