Assessment of Heavy Metal Pollution in River Water of Hanoi, Vietnam Using Multivariate Analyses
ABSTRACT Concentrations of heavy metals in water of the Nhue River (a suburban/rural river) and one of its tributaries, the To Lich River (an urban river), in Hanoi, Vietnam had been monitored, and spatial and seasonal variations in their composition were evaluated by means of principal component analysis and cluster analysis. Heavy metal concentrations in water of the two rivers were generally lower than the surface water quality standard in Vietnam, except for manganese in several sites, although they were higher than the median values in freshwater of the world by 0.42-43 times in Nhue and 0.13-32 times in To Lich. The two multivariate analyses represented that the composition of heavy metals in river water of To Lich was distinctly different from that of Nhue. It was also suggested that metal concentrations and their composition in Nhue river water would be affected by inflowing water of To Lich and wastewater discharged from the up- and middle-stream basin, and that they gradually recovered along the direction of water flow in the downstream area in rainy season.
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Article: Assessment of Heavy Metal Pollution in River Water of Hanoi, Vietnam Using Multivariate Analyses
- SourceAvailable from: Ashwani Kumar Tiwari
Current World Environment 12/2014; 9(3):843-850. DOI:10.12944/CWE.9.3.35
- "Water quality indices are tools, to determine conditions of water quality and, like any other tool, require knowledge about principles and basic concepts of water and related issues (Nikbakht 2004). Several researchers have used water quality indices methods for the assessing quality of waters (Zhang et al. 2009; Kikuchi et al. 2009; Pandey et al. 2009; Giri et al. 2010; Virha et al. 2011; Srivastava et al. 2011; Kumar et al. 2012; Prasanna et al. 2012; Díaz et al. 2013; Giri and Singh 2014; Mahato et al. 2014; Protano et al. 2014; Tiwari et al. 2014; Varghese and Jaya 2014; Panigrahy et al. 2015). However, in recent years much attention has been given towards the evaluation of heavy metal pollution in ground and surface water with the development of a heavy metal pollution index (HPI) (Reddy 1995; Mohan et al. 1996). "
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ABSTRACT: Daqing Wetland was contaminated by heavy metals for holding lots of industrial and domestic waste water. Due to their high stability and non-degradation, heavy metals are possible to gather in human body through the food chain and then threaten health. Water samples were collected from Longfeng Wetland and lake marshes in the vicinity of Daqing City. The contents of heavy metals (Cd, Pb, Cr, Cu, Zn, Ni) were determined, and the contamination degrees were evaluated simultaneously. The results indicate that heavy metals of Zn, Ni, Cd, Cr and Pd have contaminated the Longfeng Wetland severely. In addition the concentrations of Cr and Cd in some lakes around oil wells are excessively high, and have overrun the grade V based on the threshold values of surface water given by the National Environmental Protection Agency of China. Some measures have to be taken to tackle heavy metal contamination of Longfeng Wetland and lake marshes in Daqing City. KeywordsDaqing City-wetland-heavy metal-contamination-evaluationJournal of Shanghai University (English Edition) 08/2010; 14(4):262-265. DOI:10.1007/s11741-010-0641-2
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ABSTRACT: Samples collected from sites of 26 for water, soils and two native plants (Scirpus tripueter Linn. and Cyperus malaccensis Lam.) in riparian wetlands were analyzed to investigate the distribution of heavy metals (Cd, Cr, Cu, Ni, Pb and Zn) in Panyu-Nansha area of Pearl River estuary. The results indicated that concentrations of heavy metals among three compartments were in the order: soils>plants>water and no obvious correlations were found between in soils and water, water and plants. Pb is the only metal accumulated in both plants that correlated with its concentrations in soils. The weak or lack correlations among metals in water, soils and plants suggest that other factors existed influence the metal uptake and storage in plants other than absorbing from soils and water. The plants had the same trend in metal accumulation that was Cd>Zn>Cu>Ni>Cr>Pb. The translocation factors showed that metals accumulation was mostly occurred in roots for these two plants. Compared to the other heavy metals, Cd seemed to be much more hazardous. Principal Component analysis and Cluster analysis were used to analyze the relevance of different metals and identify the major sources. The results showed two factors dominated the metals variability (83.4% of total variance) that Cd and Pb, were dominated by PC1 whereas Cr, Cu and Ni charged by another factors and Zn was affected by both two components. Analysis of CA for the sampling sites showed that among all of anthropogenic pollutions, industrial wastewater was major sources of heavy metals especially for Cd, Cr, Cu and Zn in the PRE.12/2010; 2:1344-1354. DOI:10.1016/j.proenv.2010.10.145