TY - JOUR
T1 - Effect of biodegradable amendments on uranium solubility in contaminated soils
AU - Duquène, Lise
AU - Tack, Filip
AU - Meers, Erik
AU - Baeten, Jo
AU - Wannijn, Jean
AU - Vandenhove, Hildegarde
N1 - Score = 10
PY - 2007/12/3
Y1 - 2007/12/3
N2 - Chelate-assisted phytoextraction has been proposed as a potential tool for phytoremediation of U contaminated sites. In this context, the effects of five biodegradable amendments on U release in contaminated soils were evaluated. Three soils were involved in this study, one with a relatively high background level of U, and two which were contaminated with U from industrial effluents. Soils were treated with 5 mmol kg−1 dry weight of either citric acid, NH4-citrate/citric acid, oxalic acid, S,S-ethylenediamine disuccinic acid or nitrilotriacetic acid. Soil
solution concentration of U was monitored during 2 weeks. All amendments increased U concentration in soil solution, but citric acid and NH4-citrate/citric acid mixture were most effective, with up to 479-fold increase. For oxalic acid, S,S-ethylenediamine disuccinic acid and nitrilotriacetic acid, the increase ranged from10-to 100-fold. The highest concentrations were observed 1 to 7 days after treatment, after which U levels in soil solution gradually decreased. Thermodynamic stability constants (log K) of complexes did not predict the relative efficiency of the selected biodegradable amendments on U release in soil solution. Amendments efficiency was better predicted by the relative affinity of the chelate for Fe compared to U.
AB - Chelate-assisted phytoextraction has been proposed as a potential tool for phytoremediation of U contaminated sites. In this context, the effects of five biodegradable amendments on U release in contaminated soils were evaluated. Three soils were involved in this study, one with a relatively high background level of U, and two which were contaminated with U from industrial effluents. Soils were treated with 5 mmol kg−1 dry weight of either citric acid, NH4-citrate/citric acid, oxalic acid, S,S-ethylenediamine disuccinic acid or nitrilotriacetic acid. Soil
solution concentration of U was monitored during 2 weeks. All amendments increased U concentration in soil solution, but citric acid and NH4-citrate/citric acid mixture were most effective, with up to 479-fold increase. For oxalic acid, S,S-ethylenediamine disuccinic acid and nitrilotriacetic acid, the increase ranged from10-to 100-fold. The highest concentrations were observed 1 to 7 days after treatment, after which U levels in soil solution gradually decreased. Thermodynamic stability constants (log K) of complexes did not predict the relative efficiency of the selected biodegradable amendments on U release in soil solution. Amendments efficiency was better predicted by the relative affinity of the chelate for Fe compared to U.
KW - Amendment
KW - Chelate
KW - Desorption
KW - Soil solution
KW - Solubility
KW - Uranium
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_85254
UR - http://knowledgecentre.sckcen.be/so2/bibref/4701
U2 - 10.1016/j.scitotenv.2007.10.042
DO - 10.1016/j.scitotenv.2007.10.042
M3 - Article
SN - 0048-9697
VL - 391
SP - 26
EP - 33
JO - Science of the Total Environment
JF - Science of the Total Environment
IS - 1
ER -