title: [Remediation Pb, Cd contaminated soil in lead-zinc mining areas by hydroxyapatite and potassium chloride composites].
abstract: The composite agents containing potassium chloride (KCl) and Hydroxyapatite (HA) were used to remediate the lead and cadmium contaminated soil in Fenghuang lead-zinc mining-smelting areas, Hunan province. The objective of this study was to identify and evaluate the influence of Cl- to the fixing efficiency of Pb and Cd by HA. Two types of contaminated soil (HF-1, HF-2) were chosen and forty treatments were set by five different Hydroxyapatite (HA) dosages and four different Cl- dosages. The toxicity characteristic leaching procedure (TCLP) was used to evaluate the results. It showed that HA could efficiently fix the Pb and Cd from TCLP form. The maximum Pb-fixing efficiency and Cd-fixing efficiency of two types of soil were 83.3%, 97.27% and 35.96%, 57.82% when the HA: Pb: KCl molar ratio was 8: 1: 2. Compared to the fixing efficiency without KCl, KCl at the KCl: Pb molar ratio of 2 improved Pb-fixing efficiency and Cd-fixing efficiency by 6.26%, 0.33% and 7.74%, 0.83% respectively when the HA: Pb molar ratio was 8. Generally, Cl- can improve the Pb/Cd-fixing efficiency in heavy metal contaminated soil by Hydroxyapatite.
authors.affiliation: Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China. wleihoho_gogo@126.com
authors.forename: Li
authors.initials: L
authors.lastname: Wang
authors.forename: Yong-Hua
authors.initials: YH
authors.lastname: Li
authors.forename: Yan-Fang
authors.initials: YF
authors.lastname: Ji
authors.forename: Lin-Sheng
authors.initials: LS
authors.lastname: Yang
authors.forename: Hai-Rong
authors.initials: HR
authors.lastname: Li
authors.forename: Xiu-Wu
authors.initials: XW
authors.lastname: Zhang
authors.forename: Jiang-Ping
authors.initials: JP
authors.lastname: Yu
mesh_terms: D002104:Cadmium / Q000737:chemistry / Q000302:isolation & purification; D017886:Durapatite / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification*; D008906:Mining; D011189:Potassium Chloride / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification*; D015032:Zinc
chemical_list: D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead; D011189:Potassium Chloride; D017886:Durapatite; D015032:Zinc