Siddi Raju,S; Kesava Raju,K; Srinivasulu,S (1999): Hydrochemistry of Groundwaters in the Pulang river basin, Andhra Pradesh. Indian Journal of Environmental Protection, 19(4): 245-249.

In the present paper an attempt is made to bring out t the relationship between the quality of groundwater and lithological characteristics of different rocks present in the Pulang river basinf Cuddapah district. Andhra Pradesh. Ninety two groundwater samples ‘are collected from the Pulang river basin area and 19 chemical constituents are analysed. The geochemical characteristics of groundwater samples are correlated with ‘geological, pedological- and topographical conditions which has a direct bearing upon the accumulation of salts in the study area. Water samples have been classified for their suitability to different types of crops, that are grown in the basin area.

Singh,NK; Kumar,B; Singh,SK (1999): Physico- chemical characteristics of water in the upper strethches of Damodar River. Indian Journal of Environmental Protection, 19(1): 48-51.

Darnodar river water was analysed at different locations from Petratu to Rajrappa. River water upstream of Nelkari confluence is clean when compared with IS 2496, Class "C" (Inland Surface Water Norms, 1982). But after joining Nalkarl and running further through the urban - indu- -strlel areas, the river water quality gradually deteriorates.

Smith,VH; Tilman,GD; Nekola, JC (1999): Eutrophication: impacts of excess nutrient input on freshwater, marine, and terrestrial ecosystem. Environmental Pollution, 100: 179-196.

In the mid-1800s, the agricultural chemist Justus von Liebig demonstrated strong positive relationships between soil nutrient supplies and the growth yields of terrestrial plants, and it has since been found that freshwater and marine plants are equally responsive to nutrient inputs. Anthropogenic inputs of nutrients to the Earth’s surface and atmosphere have increased greatly during the past two centuries. This nutrient enrichment, or eutrophication, can lead to highly undesirable changes in ecosystem structure and function, however. In this paper we briefly review the process, the impacts, and the potential management of cultural eutrophication in freshwater, marine, and terrestrial ecosystems. We present two brief case studies (one freshwater and one marine) demonstrating that nutrient loading restriction is the essential cornerstone of aquatic eutrophication control. In addition, we pre-sent results of a preliminary statistical analysis that is consistent with the hypothesis that anthropogenic emissions of oxidized nitrogen could be influencing atmospheric levels of carbon dioxide via nitrogen stimulation of global primary production.

Sulochana,N; Stephen,BI; Selvarani,K; Thirumurugan,V (1999): Monitoring, correlation and possibilities of contamination of ground water in Thuvakudi village, Tiruchirapalli District. Indian Journal of Environmental Protection, 19(4): 290-295.

The study reports the systematic calculation of correlation co-efficient, r. for 17 water quality parameters of ground water from a village panchayat, Thuvakudi in Tiruchirapalli district, fl historic pilgrim place in South India. The well known method of least squares was applied to the experimental data. The calculated values using Y =AX + B were compared with experimental values. There was a very good correlation between the parameters, such as total hardness, chloride, electrical conductivity, total solids, total dissolved solids, calcium, magnesium and sodium with 'r' values ranging from 0.74 to 0.99. As a preliminary study to substantiate for the contaminants, 3 rock samples were calculated and possibilities for the dispersion of pollutants were attempted.

Tripathy,JK (1999): Groundwater hydrochemistry around the salt pans north of Bahuda River estuary, Orissa. Journal of Environment & Pollution, 6(2&3): 197-202.

Groundwater samples around the salt pans, adjoining Bahuda river estuary (Andhra Pradesh - Orissa border) were analysed to determine the TDS (Total Dissolved Solids) as well as the concentration of major ions such as Na+, K+, Ca+, Mg++. HCO3-, SO4-2, and Cl- Analysis results indicated that the groundwater has been contaminated by salt water as evident from the value of ratios such as Cl- / HCO3- and Mg++/Ca++. The concentration of several parameters such as TDS, Na+, and Cl- in the groundwater nearby the salt pans exceeded the maximum permissible limits thereby making the water unfit for human consumption. However, the aquifers situated away from the salt pans are found to be less affected by salinity.