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Leachates of municipal solid waste incineration bottom ash from Macao: Heavy metal concentrations and genotoxicity

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成果类型:
期刊论文
作者:
Feng, Shaolong;Wang, Xinming*;Wei, Gangjian;Peng, Pingan;Yang, Yun;Cao, Zhaohui
通讯作者:
Wang, Xinming
作者机构:
[Wang, Xinming] Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China.
Nanhua Univ, Sch Publ Hlth, Hengyang 421001, Peoples R China.
Nanhua Univ, Sch Life Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构:
[Wang, Xinming] Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China.
语种:
英文
关键词:
Municipal solid waste incineration bottom ash (MSWIBA);Toxicity characteristic leaching procedure (TCLP);Heavy metal;Genotoxicity;Micronucleus (MN) assay
期刊:
Chemosphere
ISSN:
0045-6535
年:
2007
卷:
67
期:
6
页码:
1133-1137
机构署名:
本校为其他机构
院系归属:
药学与生物科学学院
公共卫生学院
摘要:
Heavy metals in municipal solid waste incineration bottom ash (MSWIBA) may leach into soil and groundwater and pose long-term risks to the environment. In this study, toxicity characteristic leaching procedure (TCLP) was carried out on the MSWIBA from Macao. Heavy metals in leachates were determined by inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma atomic emission spectrometry (ICP-AES), and genotoxicity of leachates was also evaluated by micronucleus (MN) assay with Vicia faba root tip cells. The results showed that the concentrations of aluminium (Al), manganese (Mn), cobalt (Co), cadmium (Cd) and mercury (Hg) in the leachates were less than 0.01 mg l<sup>-1</sup>, and those of iron (Fe), copper (Cu) and molybdenum (Mo) were less than 0.1 mg l<sup>-1</sup>. The concentrations of chromium (Cr), zinc (Zn), selemium (Se), strontium (Sr), barium (Ba) and caesium (Cs) were between 0.11 mg l<sup>-1</sup> and 2.19 mg l<sup>-1</sup>. Lead (Pb) concentrations, in particular, reached as high as 19.6 mg l<sup>-1</sup>, significantly exceeding the maximum concentration limit (5 mg l<sup>-1</sup> for lead by TCLP). Compared with the negative group, a significant increase of MN frequencies was observed in the leachate-exposed groups (P &lt;0.05). With the increase of heavy metals in the leachates, the toxic effects on the Vicia faba root tip cells increased, implying that heavy metals were the main factors causing the genotoxic effects. Our results suggested that apart from chemical analysis, bioassays like the MN assay of Vicia faba root tip cells should also be included in a battery of tests to assess the eco-environmental risks of bottom ashes before decisions can be made on the utilization, treatment or disposal. &copy;2006 Elsevier Ltd. All rights reserved.

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