The present study highlight the toxicity levels of different heavy metals in aquatic environment of one of the most polluted river of Mumbai-the Mithi River. Although the river has attracted tremendous attention after 26/7 flood in Mumbai, the pollution level of the river has remained neglected issue. The present study was performed for two assessment years 2009-10 and 2010-11 at three different sampling stations namely Airport, CST Kalina and BKC Taximen's Colony along the flow of Mithi River. The results of present investigation indicates that the concentration levels of most of the heavy metals like Al, As, Cd, Cr, Hg, Ni, Pb, Sr and Mn obtained during the assessment year 2010-11 was higher than that obtained during 2009-10 by the factor of 1.4 to 5.7 µg/L. The environmental impact of these toxic heavy metals is discussed. The results point out the need of rational planning of pollution control strategies, so as to keep check on release of toxic heavy metals in the river. It is expected that the present study will be useful for rational planning of pollution control strategies and their prioritisation; to evaluate effectiveness of pollution control measures already is existence and to assess the nature and extent of pollution control needed.

The present study deals with quantification of accumulated toxic heavy metals in sediments of Mithi River of Mumbai. The study was performed at three different sampling locations along the flow of Mithi River for two years from 2009-12. The different heavy metals studied were Al, As, Cd, Cr, Hg, Ni, Pb, Sr and Mn. The results of our study indicate that the concentration level of these toxic heavy metals for the two assessment years increases by the factor of 1.2-5.8 µg/g. The result is a clear indication of day by day increasing pollution level of the Mithi River, which is creating negative environmental impact on biological life of the river. The results emphasises the need of regular scientific monitoring of different pollutants adversely affecting the environment and to reframe the pollution control strategies already in existence.

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The present study deals with the assessment of toxic heavy metals in water of Vasai Creek of Mumbai. The study was carried for the assessment years 2009-10 and 2010-11 at four different sampling stations. The heavy metals studied were Al, As, Cd, Cr, Hg, Ni, Pb, Sr and Mn. It was observed that the concentration level of the various toxic heavy metals for the year 2010-11 was higher than that obtained during the year 2009-10 by a factor of 1.1 to 1.5 µg/L. The environmental impact of these toxic heavy metals is discussed. The results of the present investigation point out the need to implement adequate environmental control and management programmes so as to minimise the toxicity effects of the heavy metals on marine life.

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