TY - JOUR
T1 - Arsenic immobilization in soils amended with drinking-water treatment residuals
AU - Sarkar, Dibyendu
AU - Makris, Konstantinos C.
AU - Vandanapu, Vandana
AU - Datta, Rupali
PY - 2007/3
Y1 - 2007/3
N2 - Use of Fe/Al hydroxide-containing materials to remediate As-contaminated sites is based on the general notion that As adsorption in soils is primarily controlled by Fe/Al (hydr)oxides. A low-cost and potentially effective substitute for natural Fe/Al hydroxides could be the drinking-water treatment residuals (WTRs). Earlier work in our laboratory has shown that WTRs are effective sorbents for As in water. We hypothesized that land-applied WTRs would work equally well for As-contaminated soils. Results showed that WTRs significantly (p < 0.001) increased the soil As sorption capacity. All WTR loads (2.5, 5, and 10%) significantly (p < 0.001) increased the overall amount of As sorbed by both soils when compared with that of the unamended controls. The amount of As desorbed with phosphate (7500 mg kg-1 load) was ∼50%. The WTR effectiveness in increasing soil As sorption capacities was unaffected by differences in both soils' chemical properties.
AB - Use of Fe/Al hydroxide-containing materials to remediate As-contaminated sites is based on the general notion that As adsorption in soils is primarily controlled by Fe/Al (hydr)oxides. A low-cost and potentially effective substitute for natural Fe/Al hydroxides could be the drinking-water treatment residuals (WTRs). Earlier work in our laboratory has shown that WTRs are effective sorbents for As in water. We hypothesized that land-applied WTRs would work equally well for As-contaminated soils. Results showed that WTRs significantly (p < 0.001) increased the soil As sorption capacity. All WTR loads (2.5, 5, and 10%) significantly (p < 0.001) increased the overall amount of As sorbed by both soils when compared with that of the unamended controls. The amount of As desorbed with phosphate (7500 mg kg-1 load) was ∼50%. The WTR effectiveness in increasing soil As sorption capacities was unaffected by differences in both soils' chemical properties.
KW - Arsenic
KW - Immobilization
KW - Pesticides
KW - Residuals
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U2 - 10.1016/j.envpol.2006.06.035
DO - 10.1016/j.envpol.2006.06.035
M3 - Article
C2 - 16939697
AN - SCOPUS:33847115282
SN - 0269-7491
VL - 146
SP - 414
EP - 419
JO - Environmental Pollution
JF - Environmental Pollution
IS - 2
ER -