title: Remediation of organochlorine pesticides (OCPs) contaminated site by successive methyl-β-cyclodextrin (MCD) and sunflower oil enhanced soil washing - Portulaca oleracea L. cultivation.
abstract: An innovative ex situ soil washing technology was developed in this study to remediate organochlorine pesticides (OCPs)-contaminated site. Elevated temperature (50 °C) combined with ultrasonication (35 kHz, 30 min) at 25 g L(-1) methyl-β-cyclodextrin and 100 mL L(-1) sunflower oil were effective in extracting OCPs from the soil. After four successive washing cycles, the removal efficiency for total OCPs, DDTs, endosulfans, 1,2,3,4,5,6-hexachlorocyclohexanes, heptachlors, and chlordanes were all about 99%. The 4th washed soil with 3 months cultivation of Portulaca oleracea L. and nutrient addition significantly increase (p<0.05) the number, biomass carbon, nitrogen, and functioning diversity of soil microorganisms. This implied that the microbiological functioning of the soil was at least partially restored. This combined cleanup strategy proved to be effective and environmental friendly.
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China. Electronic address: yemao@issas.ac.cn.
authors.forename: Mao
authors.initials: M
authors.lastname: Ye
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China; Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
authors.forename: Mingming
authors.initials: M
authors.lastname: Sun
authors.affiliation: Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Hu
authors.affiliation: Department of Chemistry, Maseno University, Private Bag, Maseno 40105, Kenya.
authors.forename: Fredrick Orori
authors.initials: FO
authors.lastname: Kengara
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China. Electronic address: jiangxin@issas.ac.cn.
authors.forename: Xin
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Yantai Institute of Costal Zone Research Chinese Academy of Sciences, Yantai 264003, PR China.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
authors.forename: Xinlun
authors.initials: X
authors.lastname: Yang
mesh_terms: D001419:Bacteria / Q000302:isolation & purification; D015169:Colony Count, Microbial; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005658:Fungi / Q000302:isolation & purification; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D031822:Portulaca / Q000254:growth & development*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000737:chemistry*; D000074242:Sunflower Oil; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D010938:Plant Oils; D012989:Soil Pollutants; D000074242:Sunflower Oil; D047392:beta-Cyclodextrins; C108732:methyl-beta-cyclodextrin
keywords: Microbial activity; OCPs-contaminated site; Portulaca oleracea L. cultivation; Soil washing