Abstract
This study was intended to determine the lead accumulation levels in liver, gill, kidney, brain, and muscle tissues of Clarias gariepinus (African sharp tooth catfish) under the sole effect of lead (1.0 and 2.0 ppm) and combined with EDTA (Ethylene diamine tetraacetic acid) (2.0 and 4.0 ppm) for 7, 15, and 30 days. Inductively coupled plasma mass spectrometry (ICP-MS) was used to determine tissue lead levels, and the SPSS package program was used for statistical evaluation of the experimental data. No mortality was observed in fish over the time periods of the experiments, and concentrations were determined with lead only and with lead together with EDTA. At the end of the experimental periods, the presence of lead increased the metal accumulation in the tissues and organs examined when compared to the control, and, in terms of accumulation, a relationship was determined between the tissues in the order of gill > kidney >liver > brain > muscle. The effect of lead together with EDTA was reduced lead accumulation in tissues and organs when compared to the effect of lead only.
Highlights
The disposal and poor management of toxic chemicals such as heavy metals negatively affect ecosystem integrity, environmental quality, and human health (Banaee et al, 2013)
At the end of the experimental periods, the presence of lead increased the metal accumulation in the tissues and organs examined when compared to the control, and, in terms of accumulation, a relationship was determined between the tissues in the order of gill > kidney > liver > brain > muscle
The effect of lead together with EDTA was reduced lead accumulation in tissues and organs when compared to the effect of lead only
Summary
The disposal and poor management of toxic chemicals such as heavy metals negatively affect ecosystem integrity, environmental quality, and human health (Banaee et al, 2013). Heavy metals such as lead, cadmium, and mercury do not have any biological functions in animal organisms, while other heavy metals, such as copper, zinc, iron, and chromium, at low concentrations, are essential for metabolic processes. They are toxic above a certain concentration range and can negatively affect all trophic levels throughout the food chain (Shukla et al, 2007). A high capacity to form complexes with heavy metals and low biological degradability in aquatic systems are the main properties of chemicals used as chelators (Kedziorek and Bourg, 2000)
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