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摘要
We determined heavy metal concentrations in water from the Pearl River watershed (PRW) to evaluate the extent of heavy metals contamination, as well as the spatial distribution and temporal variability of heavy metals in this area. Water samples from thirteen sites of the PRW were collected in March, May, August and December 2012, and analyzed for Cu, Zn, Pb, Cd, Ni, Cr, Fe, Mn and Co concentration using an atomic absorption spectrometer. Multivariate data analysis techniques including principal component analysis (PCA) and Kohonen's self-organizing maps (SOM) were utilized to examine significant spatial and seasonal variations of heavy metals, as well as to identify possible sources. The results showed that concentrations of Pb (100%), Fe (90%), Mn (52%), Cd (25%) and Ni (11%) exceeded the maximum admissible concentrations, which would pose health risk to aquatic organisms and humans. Greater contamination was observed in the locations adjacent to the Guangzhou metropolis. Heavy metal concentrations varied more during wet seasons than during dry seasons. This may be due to the effect of rainfall carrying metals from the watershed or diluting the concentrations of heavy metals at specific sites. Potential anthropogenic sources of metal pollution in the PRW surface water were identified from three categories based on principal component loadings, which may provide decision making background for enabling sustainable development by government programs.
- 出版日期2017
- 单位中国水产科学研究院珠江水产研究所
