Seasonal variation in the distribution of heavy metals in surface waters from Pulicat lake, Tamil Nadu, India
Seasonal variation in the distribution of heavy metals in surface waters of Pulicat lake, Tamil Nadu, India was assessed from January 2011 to December 2012. Variation of heavy metals was maximum during summer and minimum during monsoon. The heavy metals investigated were nickel, copper, zinc, chromium, cadmium, mercury, lead and iron. The data revealed that nickel and lead were below the permissible limits, copper, zinc, chromium and mercury were moderately above the permissible limits whereas cadmium concentration was found to be high.