heavy metals

Heavy metals levels in dried Clarias gariepinus and Channa obscura from three major markets in Benin metropolis were investigated in this work. Samples were purchased, dried and digested by standard method and the metals levels were determined using Atomic Absorption Spectrophotometer (AAS). The mean levels of cadmium and lead (0.48±0.06 and 1.36±1.13 mg/kg) and (0.62±0.45 and 5.60±7.43 mg/kg) for Clarias gariepinus and Channa obscura were found to be higher than EU standard.

Bioaccumulation of selected heavy metals in whole tissue of shrimps (Macrobrachium macrobrachion and Macrobrachium vollenhovenii) inhabiting a stretch of Benin River in Delta State, Nigeria was studied. Water samples for heavy metal determination were also collected from three different locations within the sampled stretch from January to June, 2013. Heavy metal concentrations were quantified with Unicam Atomic Absorption Spectrometry (PG 550).

Heavy metals levels in dried Clarias gariepinus and Channa obscura from three major markets in Benin metropolis were investigated in this work. Samples were purchased, dried and digested by standard method and the metals levels were determined using Atomic Absorption Spectrophotometer (AAS). The mean levels of cadmium and lead (0.48±0.06 and 1.36±1.13 mg/kg) and (0.62±0.45 and 5.60±7.43 mg/kg) for Clarias gariepinus and Channa obscura were found to be higher than EU standard.

The mangrove ecosystem is well known to be impacted by anthropogenic activities such as oil spillage, agricultural run-off, industrial effluents, and mining in coastal areas. These activities increase heavy metals accumulated by mangroves, which are eventually released back into the environment via decomposition. This study aimed to analyze the concentration of heavy metals including cadmium (Cd), Zinc (Zn), lead (Pb), and copper (Cu) in the roots and leaves of Rhizophora racemosa and mangrove sediments obtained from Egbokodo mangrove swamp in Delta State, Nigeria.

The mangrove ecosystem is well known to be impacted by anthropogenic activities such as oil spillage, agricultural run-off, industrial effluents, and mining in coastal areas. These activities increase heavy metals accumulated by mangroves, which are eventually released back into the environment via decomposition. This study aimed to analyze the concentration of heavy metals including cadmium (Cd), Zinc (Zn), lead (Pb), and copper (Cu) in the roots and leaves of Rhizophora racemosa and mangrove sediments obtained from Egbokodo mangrove swamp in Delta State, Nigeria.