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Enhanced phytoremediation of cadmium and/or benzo(a)pyrene contaminated soil by hyperaccumlator Solanum nigrum L.

Han, Ran, Dai, Huiping, Yang, Chuanjie, Wei, Shuhe, Xu, Lei, Yang, Wei, Dou, Xuekai
International journal of phytoremediation 2018 v.20 no.9 pp. 862-868
EDTA (chelating agent), Solanum nigrum, benzo(a)pyrene, cadmium, cysteine, hyperaccumulators, phytoremediation, polluted soils, polysorbates, pot culture, salicylic acid, shoots
The role of same amendment on phytoremediating different level contaminated soils is seldom known. Soil pot culture experiment was used to compare the strengthening roles of cysteine (CY), EDTA, salicylic acid (Sa), and Tween 80 (TW) on hyperaccumulator Solanum nigrum L. phytoremediating higher level of single cadmium (Cd) or Benzo(a)pyrene (BAP) and their co-contaminated soils. Results showed that the Cd capacities (ug pot⁻¹) in shoots of S. nigrum in the combined treatment T₀.₁EDTA₊₀.₉CY were the highest for the 5 and 15 mg kg⁻¹ Cd contaminated soils. When S. nigrum remediating co-contaminated soils with higher levels of Cd and BAP, that is, 5 mg kg⁻¹ Cd + 1 mg kg⁻¹ BAP and 15 mg kg⁻¹ Cd + 2 mg kg⁻¹ BAP, the treatment T₀.₉CY₊₀.₉Sₐ₊₀.₃TW showed the best enhancing remediation role. This results were different with co-contaminated soil with 0.771 mg kg⁻¹ Cd + 0.024 mg kg⁻¹ BAP. These results may tell us that the combine used of CY, SA, and TW were more useful for the contaminated soils with higher level of Cd and/or BAP. In the combined treatments of Sa+TW, CY was better than EDTA.