title: Heavy metal uptake and leaching from polluted soil using permeable barrier in DTPA-assisted phytoextraction.
abstract: Application of sewage sludge (SS) in agriculture is an alternative technique of disposing this waste. But unreasonable application of SS leads to excessive accumulation of heavy metals in soils. A column experiment was conducted to test the availability of heavy metals to Lolium perenne grown in SS-treated soils following diethylene triamine penta acetic acid (DTPA) application at rates of 0, 10 and 20 mmol kg(-1) soil. In order to prevent metal leaching in DTPA-assisted phytoextraction process, a horizontal permeable barrier was placed below the treated soil, and its effectiveness was also assessed. Results showed that DTPA addition significantly increased metal uptake by L. perenne shoots and metal leaching. Permeable barriers increased metal concentrations in plant shoots and effectively decreased metal leaching from the treated soil. Heavy metals in SS-treated soils could be gradually removed by harvesting L. perenne many times in 1 year and adding low dosage of DTPA days before each harvest.
authors.affiliation: Tianjin Key Laboratory of Animal and Plant Resistance, College of Life Sciences, Tianjin Normal University, 393 Binshuixi Road, Xiqing District, Tianjin, 300387, People's Republic of China.
authors.forename: Shulan
authors.initials: S
authors.lastname: Zhao
authors.forename: Zhiping
authors.initials: Z
authors.lastname: Shen
authors.forename: Lian
authors.initials: L
authors.lastname: Duo
mesh_terms: D001673:Biodegradation, Environmental; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D008129:Lolium / Q000737:chemistry / Q000378:metabolism; D019216:Metals, Heavy / Q000032:analysis* / Q000493:pharmacokinetics; D004369:Pentetic Acid / Q000737:chemistry*; D012722:Sewage; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000493:pharmacokinetics
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D004369:Pentetic Acid