Characterization of heavy metal pollution in river sediment of Hanoi City and its downstream area by multivariate analyses

摘要: In order to get a grasp of the current situation and characteristics heavy metal pollution in river environment Hanoi City its surrounding area, sediment was sampled from To Lich River (urban river) Nhue (suburban/rural for three times during period October 2005 June 2006 analyzed metals. Accumulations metals (in suburban area Hanoi) were found have been progressing last 8 years due wastewater discharge central part urbanized areas along rivers. Concentrations As, Cr, Cu, Mn, Ni Zn higher dry season than rainy season. However, multivariate analyses (principal component analysis cluster analysis) revealed that, regardless seasons, there two characteristic with regard composition sediment: (1) high levels Cd, TOC anthropogenic origins, (2) up- down-stream parts concentrations Mn Pb derived Hong River, headwater Nhue.