Physico-chemical interactions and bioconcentration of zinc and lead in the industrially polluted Husainsagar Lake, Hyderabad, India.
This paper deals with the interactions of different physico-chemical parameters in the water profile, and the bioconcentration of zinc and lead in Husainsagar Lake, India. The concentrations of both the metals are within the permissible limits (Indian Council of Medical Research, New Delhi, India (1975). Manual of Standards of Quality for Drinking Water Supplies. ICMR Special Report, p. 44). The concentration of Zn and Pb in the vertical profile were highest in the bottom stratum of the lake and least in the surface stratum. Their concentrations were two to three thousand-fold more in surficial sediments than in the overlying water column. The concentration of Zn increased with increasing trophic level from nanoplankton to zooplankton, but not to fish, and the concentration of Pb decreased with increasing trophic level: nanoplankton --> phytoplankton --> zooplankton --> fish, illustrating no bioconcentration of metals in the classic sense of the term as has been noted for mercury and chlorinated hydrocarbons (DDT).
Prahalad
A K
AK
Department of Microbiology, Osmania University, Hyderabad-500 007, India.
Seenayya
G
G