title: An inter-laboratory study to test the ability of amendments to reduce the availability of Cd, Pb, and Zn in situ.
abstract: An international inter-laboratory research program investigated the effectiveness of in situ remediation of soils contaminated by cadmium, lead and zinc, measuring changes in soil and soil solution chemistry, plants and soil microbiota. A common soil, from mine wastes in Jasper County MO, was used. The soil was pH 5.9, had low organic matter (1.2 g kg(-1) C) and total Cd, Pb, and Zn concentrations of 92, 5022, and 18 532 mg kg(-1), respectively. Amendments included lime, phosphorus (P), red mud (RM), cyclonic ashes (CA), biosolids (BIO), and water treatment residuals (WTR). Both soil solution and NH4NO3 extractable metals were decreased by all treatments. Phytotoxicity of metals was reduced, with plants grown in P treatments having the highest yields and lowest metal concentration (0.5, 7.2 and 406 mg kg(-1) Cd, Pb, and Zn). Response of soil micro-organisms was similar to plant responses. Phosphorus addition reduced the physiologically based extraction test Pb from 84% of total Pb extracted in the untreated soil to 34.1%.
authors.affiliation: Box 352100 University of Washington, Seattle, WA 98195, USA. slb@u.washington.edu
authors.forename: Sally
authors.initials: S
authors.lastname: Brown
authors.forename: Barbara
authors.initials: B
authors.lastname: Christensen
authors.forename: Enzo
authors.initials: E
authors.lastname: Lombi
authors.forename: Mike
authors.initials: M
authors.lastname: McLaughlin
authors.forename: Steve
authors.initials: S
authors.lastname: McGrath
authors.forename: Jan
authors.initials: J
authors.lastname: Colpaert
authors.forename: Jaco
authors.initials: J
authors.lastname: Vangronsveld
mesh_terms: D001673:Biodegradation, Environmental; D002104:Cadmium; D002119:Calcium Carbonate; D019015:Geologic Sediments; D007220:Industrial Waste; D007391:International Cooperation; D007854:Lead; D019216:Metals, Heavy; D008906:Mining; D010758:Phosphorus; D063245:Plant Development; D012722:Sewage; D012988:Soil Microbiology; D012989:Soil Pollutants; D018675:Toxicity Tests; D014481:United States; D015032:Zinc
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D012722:Sewage; D012989:Soil Pollutants; D002104:Cadmium; D010758:Phosphorus; D007854:Lead; D002119:Calcium Carbonate; D015032:Zinc