The dehydrogenase activity (DHA) has been proposed as a measure of overall microbial activity and used as index of the soil microbial biomass. DHA is measured by two methods using TTC and INT as substrate, however, various authors reported poor results when TTC is used as substrate.

Gurgaon Canal is one of the main source of irrigation in Faridabad, and Gurgaon district of Haryana. Water quality evaluation of canal water was carried out to assess the qualitative changes and possibility of point and and non point pollution loads.

Groundwater sampling was carried out at 25 locations from dug wells and bore wells in Rajpura tehsil in Chandrapur district during post monsoon season (October 2009) to assertion groundwater fluoride concentration.

Effluent resulting due to various processes from tanning industries may lead to groundwater pollution when they are disposed off without proper treatment.

Trivalent chromium occurs naturally in rocks, soil and plants. Cr (VI) is produced when Cr (III) is heated in the presence of mineral bases. Cr (VI) compounds are emitted into the air, water and soil by different industries.

Studies on the marine environment of the Kollam coast, south-west coast of India were carried out from June 2006 to May 2008 incorporating variations from pre-monsoon through monsoon to post-monsoon.

Totally 19 hydrographical parameters are estimated in the Kamana and Karanji lakes of Mysore city and subjected wot hierarchical cluster analysis with the help of SYSTAT 7.0 software. Similarity of water quaity in different months (variables) is used as measure in hierarchical cluster analysis.

Considering the extent of pollution and the rapid rate of depletion in both the quality and quantity of surface water, man has put his eyes on the groundwater for safe and immediate consumption.

The Rani tailayya (pond) is one of the famous water bodies of Chhatarpur district, M.P. The area of this pond is 3.035 ha. Monitoring of physico-chemical and biological analysis of water was carried out monthly during November 2004 to January 2005.

For understantind the fluoride characterization, about 82 groundwater samples has been collected at different locations in the study area. Charnockite and biotite gneiss are the major lithounits of the area.