concentrations indicated this is a conservative metals in this
aquatic system, whereas the Mn and Cu were observed under
permissible limits. The Orontes river water indicated that
highest concentration of all selected heavy metals study
according (Ayse Baher 2010)[12] and second highest polluted
river Tigaris study on (Hulya et al 2007)[38] shown in Table 2.
The Zn, Mn and Cu are generally good indicators of
anthropogenic inputs and zinc is used in galvanizing steel and
iron product (Ayse Baher 2010) [12]. Zinc oxide is used in
rubber manufacturing industries as an additive to activate
vulcanization process. Zinc carbamates were used as pesticides
(Aboud and Nandini 2009) [11]. The concentration of heavy
metals varied seasonally and showed highest concentration in
pre-monsoon season followed by monsoon and post-monsoon
season. A similar trend was observed (Lohani et al. 2008) [46]
in Gomti River (pre-monsoon > monsoon > postmonsoon)