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2013 | 22 | 2 |
Tytuł artykułu

Origin and risk assessment of potentially harmful elements in river sediments of urban, suburban, and rural areas

Autorzy
Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The Changjiang Delta Region is a rapidly urbanizing area in China. But this area still reveals different anthropogenic activities and urbanization levels. River sediments from urban, suburban, and rural areas were studied to characterize potentially harmful elements (PHEs) and their ecological risks. Chemical compositions of sediments were analyzed, which revealed pronounced differences in three areas. Al₂O₃, Fe₂O₃, CaO, and MgO were elevated in the urban sediments. Sediments from the rural area showed high organic matter. CaO and TOC of sediments fluctuated significantly in the suburban area. They are associated with the local geological provenance and sediment circumstance. The enrichments of PHEs in sediments of urban rivers were prevalent, among which Cd and As were prominent. Concentrations of PHEs in the suburban area fluctuated significantly. Lead and Cu were obviously enriched in this area. Rural sediments had relatively low concentrations of PHEs, which were also stable in the regional distribution, although As showed a slight enrichment. Based on RI values from Hakanson, the urban sediments showed moderate to considerable ecological risk. And the suburban sediments were in moderate ecological risk, except some high-risk samples. The majority of rural sediments revealed low ecological risk. Of these hazardous elements, Cd, Hg, and Pb contribute the largest proportion of the total ecological risk. It is evident that the urbanization level influences the distributions and contamination grades of PHEs for river sediments of the Changjiang Delta Region.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
22
Numer
2
Opis fizyczny
p.599-610,fig.,ref.
Twórcy
autor
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Nanjing, Jiangsu 210098, PR China
  • College of the Environment, Hohai University, Nanjing, Jiangsu 210098, PR China
autor
  • College of the Environment, Hohai University, Nanjing, Jiangsu 210098, PR China
autor
  • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Nanjing, Jiangsu 210098, PR China
  • College of the Environment, Hohai University, Nanjing, Jiangsu 210098, PR China
autor
  • College of the Environment, Hohai University, Nanjing, Jiangsu 210098, PR China
autor
  • College of the Environment, Hohai University, Nanjing, Jiangsu 210098, PR China
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.agro-5f2e4276-5ee8-471b-8ff4-0d042aff0c9e
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