Environmental Assessment of Heavy Metals ( Zn, Pb, Cd, Ni ) in the Shavoor River Sediments in the Seasons (Winter, Spring, Summer, Fall)


Abstract:

This study was conducted in order to determine concentration and toxicity of heavy metals (Ni, Zn, Cd, pb) in Shavoor river sediments. Sampling were performed seasonally (four seasons) from 2013 winter till at the end of 2014 fall. For the Sediment sampling in five stations for each season, and each station contains three frequencies was adopted . in each station The samples were mixed and the overall number of 480 samples were analyzed in the total seasons. The digestion of sediment samples used by (Yap, 2000) . the measuring Concentration heavy Metals based on ppm by Atomic Absorption Spectrometry (AAS) and the metal concentration according to ppb have been used from ICP . the mean of metals condensation in the sediment samples for, lead, cadmium, nickel and zinc metals respectively, 85/2, 56/1, 92/62, 71/144, in milligrams per kilogram of dry sample.in Compared with international standards in terms of impact, the study showed that the condensation of heavy metals ( Zn, pb) in the Threshold effect class and cadmium have effects midrange but the concentrations of Ni is higher that international standard(extreme effect class) . Smith index calculation that the concentration of nickel metal toxicity can have harmful effects (TUI = 1.73, TUI> 1). Results of the Haknson Index calculated showed that the degree of contamination in station 4 is medium (mCd = 2.64) .and others stations were low degree of contamination .

Keywords: heavy metals; sediment; standard