Influence of an iron-rich amendment on chemical lability and plant (Raphanus sativus L.) availability of two metallic elements (As and Pb) on mine-impacted agricultural soils

• Published in: Environmental science and pollution research international 2016-10, Vol.23 (20), p.20739-20748
• Main Authors: Kim, Juhee, Kim, Yong-Seong, Hyun, Seunghun, Moon, Deok Hyun, Chang, Jun Young
• Format: Article
• Language: English
• Subjects: Agricultural land; Agricultural pollution; Agriculture - methods; Aquatic Pollution; Arsenic - analysis; Arsenic - metabolism; Atmospheric Protection/Air Quality Control/Air Pollution; Canola; Chemical contaminants; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental monitoring; Environmental science; Fractions; Heavy metals; Iron; Iron - chemistry; Lead; Lead - analysis; Lead - metabolism; Metals; Mines; Mining; Plant growth; Plant Roots - chemistry; Plant Roots - growth & development; Radishes; Raphanus - chemistry; Raphanus - growth & development; Raphanus sativus; Research Article; Seedlings; Sewage - chemistry; Sludge; Soil - chemistry; Soil - standards; Soil amendment; Soil contamination; Soil Pollutants - analysis; Soil Pollutants - metabolism; Soil treatment; Solids; Studies; Toxicity; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-016-7278-9

Variation of the chemical extractability and phytoavailability of two metallic elements (e.g., As and Pb) on amendment-treated soils was investigated. Four mine-impacted agricultural soils contaminated with both As (174–491 mg kg −1 ) and Pb (116–357 mg kg −1 ) were amended with an iron-rich sludge at the rate of 5 % ( w / w ). After a 4-, 8-, and 16-week incubation, the extractability of metallic elements was assessed by sequential extraction procedure (SEP; F1–F5). The control without amendment was also run. In amended soils, the labile element mass (i.e., F1 + F2) promptly decreased (15–48 % of As and 5–10 % of Pb) in 4 weeks, but the decrement was continued over 16 weeks up to 70 and 28 % for As and Pb, respectively. The labile mass decrement was quantitatively corresponded with the increment of F3 (bound to amorphous metal oxides). In plant test assessed by radish ( Raphanus sativus ) grown on the 16-week soils, up to 57 % of As and 28 % of Pb accumulation was suppressed and 10–43 % of growth (i.e., shoot/root elongation and fresh weight) was improved. For both the control and amended soils, element uptake by plant was well correlated with their labile soil concentrations ( r 2  = 0.799 and 0.499 for As and Pb, respectively). The results confirmed that the iron-rich material can effectively suppress element uptake during R. sativus seedling growth, most likely due to the chemical stabilization of metallic elements in growth medium.