Investigation on bioaccumulation of heavy metals like lead, cadmium and mercury by pigeonpea an important pulse crop of India, were undertaken. The experiments were performed to evaluate the extend of accumulation of these metals in the aerial parts of the plant.

The present investigation deals with the analysis of physico-chemical characteristics, concentration of heavy metals and textural analysis of sediments in Poovar estuary of Kerala during the period 2004-2005. Three sampling stations were selected and sediments were collected for the study.

The use of heavy metals along with the associate risks of metal pollution has increased to a great extent over the recent times. Cadmium is one of the most harmful toxic metals. This metal is being increasingly consumed in the industries. Its pollution potential, has therefore given rise to the necessity of removal of cadmium from wastewater.

A study was carried out on toxic effects of cadmium nitrate on chlorophyll content of soybean and pigeon pea for two crop seasons. The concentration studied were 0.01M, 0.001M and 0.0001M. Chlorophyll content markedly decreased in all the treated plants and the decline was directly related to the concentration.

The simultaneous determination of heavy metals associated with airborne particulate matter in the atmosphere of the city of Isfahan (Iran) was performed by inductively coupled plasma atomic emission spectrometry (ICP-AES) after pre-concentration with sodium diethyldithiocarbamate.

The removal of chromium (VI) from synthetic wastewater by adsorption on activated carbon prepared from Royal Poinciana shell was tried to determine the effects of different dosages and different pH.

Water quality of lake normall get contaminated every where by accumulaton of sediments, human waste, silt, organic matter, industrial waste but in India different type of religious activities (idol immersion) are taking place every year, to which other countries are not concerned. The water bodies selected for the study are Upper and Lower Lakes of Bhopal, Madhya Pradesh.

In Shiraz plain, there are 1070 ha of agriculture, 540 hectares of that is used for, vegetable cultivation. Two rivers are crossing Shiraz plain west to east. They are called Khoshk river and Soltanabad river. East and south of the city of Shiraz in two seprate countryside, people use polluted river waters for vegetable cultivation by pumping.

The objective of the present study is to assess the migrating behaviour of nickel and chromium through the soil collected around an ash-pond site through laboratory studies and an undertaking of contaminant (Nickel and Chromium)- soil interaction phenomena for unraveling the transport mechanism of nickel and chromium through soil and ground water with an attempt to validate 2 D mathematical modeli