determination of heavy metal pollution (hg, pb, cd, ni, fe and zn) in the bamdezh wetland sediments using muller geochemical index

present survey studies intensity of heavy metals pollution (ca, fe, ni, cd, pb, zn, as, hg) in the sediments of bamdezh wetland. the main objective of the study is to quantify heavy metal pollution intensity in the wetland. other objectives of the study are separation of natural and anthropogenic heavy metal pollution and identification of the origin of heavy metals. results of this study shows igeo formula values of as, ni and pb (respectively 1.52, 1.1 and 1.29) in the bamdezh sediments that are in the category of very low to moderate, fe and zn concentrations (respectively 0.35, and 0.96) are in the category of no pollution, cd concentration (2.87) is in the category of moderate to high pollution and hg concentration (6.37) is in the category of very high pollution. percentage of natural and anthropogenic sections of studied heavy metals shows that cd and pb pollution are mostly from anthropogenic origin and fe, zn, ni and also ca are mostly from natural origin. result of cluster analysis shows that pb should have biological origin. since ni and fe are related together by high similarity coefficient therefore it can be concluded that the origin of ni is anthropogenic. origin of organic matter in the sediments is not from geological sources and therefore the origin of as and hg that are highly related to organic matter can not be natural.