title: Multivariate statistical study of organic pollutants in Nanjing reach of Yangtze River.
abstract: Multivariate statistical approach was used to identify the source apportionment of 25 semi-volatile compounds (SVOCs) in surface water in Nanjing reach of Yangtze River, China. Surface water samples were collected from six sites in January 2007. Concentrations of SVOCs were determined by gas chromatography equipped with a mass spectrometry detector (GC-MS). Cluster analysis (CA) and principal component analysis-multiple linear regression (PCA-MLR) were used for evaluation of contamination status, distribution and source apportionment. The results of CA showed that the six sites in this study could be divided into two significant groups, i.e. low and high pollutant groups. PCA-MLR results suggested that four source types were identified, explaining about 84.5% of the total variance. Of four sources, industrial and domestic sewage sources contributed 43.5-64.8% of various SVOCs in six sites, precipitance and runoff sources 4.22-42.87%, shipping sources 4.22-23.49%, and other miscellaneous sources 1.05-8.97%. These results indicated that point source pollutants affected the water quality of this region. High correlation coefficient (R(2)=0.973) between the measured and predicted concentrations of SVOCs suggested the applicability of the PCA-MLR for estimation of source contribution to the SVOCs in water.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Wu
authors.forename: Dayong
authors.initials: D
authors.lastname: Zhao
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xuxiang
authors.initials: X
authors.lastname: Zhang
authors.forename: Shupei
authors.initials: S
authors.lastname: Cheng
mesh_terms: D002681:China; D004784:Environmental Monitoring; D008401:Gas Chromatography-Mass Spectrometry; D015999:Multivariate Analysis; D025341:Principal Component Analysis; D045483:Rivers / Q000737:chemistry*; D012722:Sewage; D055549:Volatile Organic Compounds / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D012722:Sewage; D055549:Volatile Organic Compounds; D014874:Water Pollutants, Chemical