title: Chemical-assisted phytoremediation of CD-PAHs contaminated soils using Solanum nigrum L.
abstract: A well-characterized cadmium (Cd) hyperaccumulating plant Solanum nigrum was grown in Cd and polycyclic aromatic hydrocarbons (PAHs) co-contaminated soil that was repeatedly amended with chemicals, including EDTA, cysteine (CY), salicylic acid (Sa), and Tween 80 (TW80), to test individual and combined treatment effects on phytoremediation of Cd-PAHs contaminated soils. Plant growth was negatively affected by exogenous chemicals except for EDTA. S. nigrum could accumulate Cd in tissues without assistant chemicals, while there was no visible effect on the degradation of PAHs. Cysteine had significant effects on phytoextraction of Cd and the highest metal extraction ratio (1.27%) was observed in 0.9 mmol/kg CY treatment. Both salicylic acid and Tween 80 had stimulative effects on the degradation of PAHs and there was the maximal degradation rate (52.6%) of total PAHs while 0.9 mmol/kg Sa was applied. Furthermore, the combined treatment T(0.1EDTA+0.9CY+0.5TW80) and T(0.5EDTA+0.9CY+03Sa) could not only increase the accumulation of Cd in plant tissues, but also promote the degradation of PAHs. These results indicated that S. nigrum might be effective in phytoextracting Cd and enhancing the biodegradation of PAHs in the co-contaminated soils with assistant chemicals.
authors.affiliation: Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Chuanjie
authors.initials: C
authors.lastname: Yang
authors.forename: Qixing
authors.initials: Q
authors.lastname: Zhou
authors.forename: Shuhe
authors.initials: S
authors.lastname: Wei
authors.forename: Yahu
authors.initials: Y
authors.lastname: Hu
authors.forename: Yanyu
authors.initials: Y
authors.lastname: Bao
mesh_terms: D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D002104:Cadmium / Q000032:analysis / Q000378:metabolism*; D002614:Chelating Agents / Q000494:pharmacology; D003545:Cysteine / Q000494:pharmacology; D004492:Edetic Acid / Q000494:pharmacology; D004787:Environmental Pollution; D035264:Flowers / Q000737:chemistry / Q000378:metabolism; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism; D018520:Plant Shoots / Q000737:chemistry / Q000378:metabolism; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000378:metabolism*; D011136:Polysorbates / Q000494:pharmacology; D020156:Salicylic Acid / Q000494:pharmacology; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D032324:Solanum nigrum / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D013501:Surface-Active Agents / Q000494:pharmacology
chemical_list: D002614:Chelating Agents; D011084:Polycyclic Aromatic Hydrocarbons; D011136:Polysorbates; D012987:Soil; D012989:Soil Pollutants; D013501:Surface-Active Agents; D002104:Cadmium; D004492:Edetic Acid; D003545:Cysteine; D020156:Salicylic Acid