Leaching of Cu, Cd, Pb, and phosphorus and their availability in the phosphate-amended contaminated soils under simulated acid rain

• Published in: Environmental science and pollution research international 2017-09, Vol.24 (26), p.21128-21137
• Main Authors: Cui, Hongbiao, Zhang, Shiwen, Li, Ruyan, Yi, Qitao, Zheng, Xuebo, Hu, Youbiao, Zhou, Jing
• Format: Article
• Language: English
• Subjects: Acid rain; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Cadmium; Calcium chloride; Copper; Earth and Environmental Science; Ecotoxicology; Electrical conductivity; Electrical resistivity; Environment; Environmental Chemistry; Environmental Health; Environmental science; Eutrophication; Groundwater; Heavy metals; Hydroxyapatite; Immobilization; Leachates; Leaching; Lead; Metals; Organic carbon; pH effects; Phosphate; Phosphorus; Quality standards; Rain; Research Article; Soil contamination; Surface water; Surface-groundwater relations; Total organic carbon; Waste Water Technology; Water Management; Water Pollution Control
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-017-9696-8

Phosphate amendments have been used to immobilize heavy metal-contaminated soils. However, phosphate amendments contain large amounts of phosphorus, which could leach out to potentially contaminate groundwater and surface water. A laboratory column leaching experiment was designed to study the effects of simulated acid rain (SAR) on the potential release of copper (Cu), lead (Pb), cadmium (Cd), and phosphorus (P), and their availability after immobilizing with hydroxyapatite (HAP) and potassium dihydrogen phosphate (PDP). The application of HAP and PDP enhanced the leachate electrical conductivity, total organic carbon, and pH. Higher P was found in the PDP- (>4.29 mg L −1 ) and HAP-treated (>1.69 mg L −1 ) columns than that in untreated (