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International Journal of Environmental Research
University of Tehran
ISSN: 1735-6865 EISSN: 1735-6865
Vol. 3, No. 2, 2009, pp. 189-198
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Bioline Code: er09021
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environmental Research, Vol. 3, No. 2, 2009, pp. 189-198
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Natural Pollution By Some Heavy Metals in the Tigris River, Northern Iraq
Al-Juboury, A. I.
Abstract
Twenty samples of the recent sediments were collected from the Tigris River and some
of its tributaries of northern Iraq and twelve samples from the Miocene and Quaternary sediments.
The study is conducted to define and assess the paleoenvironmental pollution by some heavy
metals in these sediments in order to elucidate the probable source rocks and the main mineral
phases suggested to be a source of such pollution by using X-ray diffraction, X-ray fluorescence
and scanning electron microscopes analyses. The study indicates a polluted level of some heavy
metals mainly Cr, Cu, Ni, Pb and Zn. Clay and heavy minerals may form the main sources for this
natural pollution. The combined affects of mechanical attrition and chemical etching during the
transportation by the river water are indicated through several morphological characteristics on the
surface textures of the heavy minerals. The high concentration of some of the studied trace elements
could be attributed to incorporation of such elements in the lattice of the heavy and clay minerals.
Keywords
Heavy metals, North Iraq, Pollution; Provenance, Tigris River
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