Partitioning of trace metals between dissolved and particulate phases in a typical backwater system of Kerala,India

Concentrations of dissolved and particulate trace metals (Ni, Pb, Zn and Mn) and their partitioning behaviour between the dissolved and particulate phases in a typical backwater system of Kerala, viz. the southern upstream part of Cochin Estuarine System (South India), have been studied. Spatial and temporal variations of trace metals in the dissolved and particulate phases have been discussed with special reference to pH, dissolved oxygen, salinity and suspended particulate matter. The distribution and partitioning behaviour of trace metals in the water column were found influenced by the presence of a salinity barrier across the backwater system and also by the massive use of pesticides and chemical fertilizers in the vast area of agricultural land near the backwater system. Lack of proper flushing of the backwaters, which receive large amount of trace metals through the application of pesticides and agro‐chemicals, due to the presence of the salinity barrier has significantly affected the water quality of the area.