Premium
A Mimicked In‐Situ Remediation Study of Metal‐Contaminated Soils with Emphasis on Cadmium and Lead
Author(s) -
Mench Michel J.,
Didier Valérie L.,
Löffler Monika,
Gomez Alain,
Masson Pierre
Publication year - 1994
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1994.00472425002300010010x
Subject(s) - chemistry , soil water , environmental remediation , lime , environmental chemistry , shoot , cadmium , bioavailability , phosphate , metal , soil ph , soil contamination , manganese , lolium , horticulture , agronomy , contamination , metallurgy , poaceae , environmental science , biology , ecology , bioinformatics , materials science , organic chemistry , soil science
The capacity of several additives, i.e., lime, Thomas phosphate basic slag (TBS), hydrous iron oxides (HFO), hydrous manganese oxides (HMO), and Beringite, added to soil to fix Cd or Pb, was evaluated using two pot experiments in tandem with soil extractions. Three soils from France with metal contents ranging from 0.17 to 108 mg Cd kg −1 soil dry weight (DW) and 47 to 1112 mg Pb kg −1 soil DW were studied. Metal sources were: sludge‐borne metals (Soil A), fallout from a smelter (Soil B), and emission from a tetraethyl Pb production facility (Soil C). Ryegrass ( Lolium spp.) or tobacco ( Nicotiana tabacum L.) shoots were harvested. The addition of HMO decreased to a maximum extent Cd in ryegrass and tobacco for Soils A and B, but did not suppress the differences in Cd uptake between the two plant species. Use of HMO reduced Pb concentrations only in ryegrass shoots. Thomas phosphate basic slag lowered Pb bioavailability in Soils B and C. The addition of HMO into Soils A and B reduced Cd concentrations in water, 0.1 M Ca(NO 3 ) 2 , or 0.43 M acetic acid (HOAc) extracts, but not in 0.05 M EDTA pH 7 extracts. Water and sequential extractions were employed on Soil C: HMO caused the most reduction in Pb water‐soluble and HOAc‐extractable fractions, and rendered Pb less extractable with H 2 O 2 and more with HONH 3 Cl. The decrease of Cd‐ and Pb‐soluble fractions was reflected in their suppressed bioavailability. Among the screened additives, HMO exhibited a most promising potential to reduce either Cd or Pb transfer from soil to soil solution or their entry into the food chain via plant uptake. This material would be promising for in‐situ remediation technologies geared to restore Cd‐ and Pb‐contaminated soils. However, little is known about the kinetics and persistence of this chemical under field conditions.