Concentrations of Copper and Zinc in Benthic Invertebrates Collected from the Tigris River at Baghdad City

Year 2016, Volume: 11 Issue: 1, 8 - 17, 30.03.2016

Muhanned R. Nashaat Muhammad N. Al-azzawi Dhea′a S. Ahmed

Abstract

The present study aims to assess the concentrations of Copper and Zinc in collected benthic
invertebrates from Tigris River.
Four stations were chosen on Tigris River along Baghdad City, the samples were
collected every 60 days from November 2010 to September 2011. The benthic
invertebrates which collected were: Bivalves: Corbiculla fluminalis, Gastropods:Melanopsis
nodosa, Theodoxusis jordani and Physa gyrina, Oligocheates:
aquatic worm, and dragon flies nymphs. The annual concentration of Cu in C.
fluminalis soft tissue was 96.45 µg/g, while in the shell was 10.35µg/g.
The Zn concentration in soft tissue was 201.7 µg/g, while in the shell was17.8
µg/g. In M. nodosa soft tissue had Cu concentration of 64.0µg/g, while
the shell had 6.1µg/g. On other hand, Zn concentration in soft tissue was 297.5
µg/g, and in the shell was 21.1 µg/g., While in the T. jordani the
concentration of Cu was 24.2 µg/g and the Zn concentration was 62.35 µg/g. Whereas
in P. gyrina it found that the concentration of Cu was 32.4 µg/g, while
the concentration of Zn was 76.2 µg/g. Aquatic worm had the concentration of Cu
127.0 µg/g and for Zn was 277.2 µg/g. The concentration of Cu and Zn were
undetectable in Dragon flies nymphs that collected in spring and autumn. The
benthic invertebrates, oligochaetes had the highest concentration of Cu, while
M. nodosa had the highest Zn among the collected benthos, while soft tissue
of bivalve C. fluminalis had the highest concentration of Cu and Zn than
gastropods except soft tissue of M. nodosa. Depend on the statistical
analysis results the soft tissues of bivalves and gastropods had higher
concentrations of Cu and Zn than the concentration in the shell. In general,
the Zn concentrations in all collected organisms were higher than Cu
concentrations. 

Keywords

benthic invertebrates, Heavy Metals, Copper and Zinc, Tigris River

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