Abstract
Bioaccumulation of heavy metals in the terrestrial invertebrates in Al-Jadriyia district Baghdad- Iraq were investigated. Forth terrestrial invertebrates snails, slug, isopods, and diplopods , were selected for this study. The results showed that all invertebrate groups have the ability in accumulate considerable amounts of heavy metals. Higher levels of zinc and copper were observed in the isopods specimens, it's about ( 60.50±0.58 ) and ( 96.00±0.58 ) ppm respectively , while higher levels of lead were observed in the diplopods specimens ,it's about ( 23.00±1.15 ) ppm ,but the higher levels of both iron and cadmium were observed in snail specimens , it's about ( 590.00±1.15 ) and ( 9.50±1.15 ) ppm respectively .but the higher level between all heavy metals concentration in soil specimens were recorded in iron , zinc , lead, copper, and cadmium, it's about ( 8000.00±1.73 ) , ( 33.00±1.73 ) , ( 30.00±1.15 ) , ( 20.00±0.58 ) , and ( 10.00±1.73 ) ppm respectively .The correlation values show that most significant in some metals , while they show that non significant between in other metals .
Highlights
Heavy metals constitute a very heterogeneous group of elements widely varied in their chemical properties and biological functions [ 1 ] .They are considered as very important and kept under environmental pollutant category due to their highly toxic effects in the various environmental departments [ 2 ]
Another invertebrate group used in toxicological studies is terrestrial arthropods such as, Isopoda and Diplopoda, due to the most suitable animals to evaluate the impacts of toxic substances such as heavy metals present in the soil, because the direct contact between these arthropods and soil contaminants [ 20, 21 ]
The resultant residue was dissolved in 10 ml(1:1) Hydrochloric acid (HCl); and diluted to the 100ml mark with distilled water. This solution was used for the determination of the heavy metals in triplicates on atomic absorption spectrophotometer (AAS) in accordance with [32] and standard methods of [ 33 ]
Summary
Heavy metals constitute a very heterogeneous group of elements widely varied in their chemical properties and biological functions [ 1 ] .They are considered as very important and kept under environmental pollutant category due to their highly toxic effects in the various environmental departments [ 2 ]. [16 ].And due to the differences in the ecophysiology of metals, or the experimental methodology, or species difference, or food chains, so that biomagnifications of metals are not general to all environmental ecosystems [17,18].Several authors have reported the importance of molluscans as good indicators for monitoring heavy metal pollution even though the abnormally high environmental concentrations of heavy metal affects numerous biological processes involved in the development and maintenance of molluscan populations such as feeding, growth, reproduction, general physiological activities and maturity [19] Another invertebrate group used in toxicological studies is terrestrial arthropods such as, Isopoda and Diplopoda, due to the most suitable animals to evaluate the impacts of toxic substances such as heavy metals present in the soil, because the direct contact between these arthropods and soil contaminants [ 20 , ]. The aim of this study: The studying designed to test the efficiency of some terrestrial invertebrates groups for heavy metals accumulation and capable use it in biomonitoring these contaminants in different ecosystems
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