title: Impact of black carbon originated from fly ash and soot on the toxicity of pentachlorophenol in sediment.
abstract: The widely existing fly ash and soot produced during the process of combustion, which are often known as waste but also an important source of black carbon (BC) in the environment, were treated by HCl and HF solution for this study, and recorded as FC and SC, respectively. A series of experiments were carried out to investigate the toxicity of pentachlorophenol (PCP) in sediment, influence of various BCs in sediment with different contents (0%, 0.5%, 1%, 2%, 5% and 10%) on the extractability and toxicity of PCP (50mg/kg), and toxicity of various BC in sediment. The results demonstrated that the PCP exposure to wheat seed exhibited a dose-dependent behavior, and the extractability and toxicity of PCP decreased with the increasing content of BC in sediment. The PCP extractable rate was significantly (P<0.01) influenced by the higher content of BCs. Noticeably, each BC had no toxic but stimulative effect on root elongation and early seedling growth. Furthermore, it was found that the inhibitive effect on the extractability and toxicity of PCP and the stimulative effect on root elongation and early seedling growth caused by SC were more evident than FC.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, China. loulp@zju.edu.cn
authors.forename: Liping
authors.initials: L
authors.lastname: Lou
authors.forename: Ling
authors.initials: L
authors.lastname: Luo
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Xinhua
authors.initials: X
authors.lastname: Xu
authors.forename: Jiaai
authors.initials: J
authors.lastname: Hou
authors.forename: Bei
authors.initials: B
authors.lastname: Xun
authors.forename: Yingxu
authors.initials: Y
authors.lastname: Chen
mesh_terms: D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D019015:Geologic Sediments; D006851:Hydrochloric Acid; D006858:Hydrofluoric Acid; D052638:Particulate Matter / Q000737:chemistry*; D010416:Pentachlorophenol / Q000633:toxicity*; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development; D053260:Soot / Q000633:toxicity*; D014908:Triticum / Q000187:drug effects* / Q000254:growth & development
chemical_list: D060729:Coal Ash; D052638:Particulate Matter; D053260:Soot; D002244:Carbon; D010416:Pentachlorophenol; D006851:Hydrochloric Acid; D006858:Hydrofluoric Acid