Abstract
The selective removal of trace metals by suspended matter in high turbidity zones plays a major role in the fluvial transport of terrigenous metals to the marine environment. The seasonal longitudinal variability of trace elements (Cu, Zn, Cd, Ni, Pb, Fe, and Mn) in Cochin estuary, a tropical positive estuary, was studied and the results were compared with the prevailing situation in other subtropical waterways. The hydrodynamical features showed increasing turbidity downstream with increasing salinities during both the seasons. In contrast with the temperate estuaries where the development of turbidity maxima causes the removal of metals, the estuaries of tropics modify the fluvial transport of metals by the way of redistribution between the dissolved and particulate fractions in the intermediate salinities. In Cochin estuary, the distributional features of trace metals are primarily influenced by the variations in salinities and river discharges. Consequently, this gives rise to two different types of distributional patterns: (1) during premonsoon, the estuarine reactivity is more pronounced and hence, mid-estuarine solubilization of the particulate metal appears to play a prominent role in controlling the fluxes of trace metals studied and (2) but during monsoon, the hydrological conditions influence the downstream transport of the metals more by physical dilution than chemical reactivity.
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We thank Cochin University of Science and Technology for use of facilities. The authors gratefully acknowledge one of the Anonymous Referees for the careful reading and the valuable comments and suggestions to improve this article.
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Nair, S.M., Balchand, A.N., Prashob Peter, K.J. et al. Mobilization of trace metals in a tropical turbid estuary influenced by a monsoon season. Environ Earth Sci 70, 807–819 (2013). https://doi.org/10.1007/s12665-012-2170-5
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DOI: https://doi.org/10.1007/s12665-012-2170-5