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Article Title: Concentration of Cd and Ni in the Sediment and Biota of a Benthic fauna (Periophthalmus papillo) from Elechi Creek, Upper Bonny Estuary

Abstract:

Cadmium and Nikel has been associated with increased incidence of cancer in humans. This study determined the bioconcentration of Cd and Ni in the tissue of Periophthalmus papillo and its health risk implication using the Estimated Daily Intake (EDI) and Hazard Quotient (HQ). The Pollution Load Index (PLI) of the various stations where the biota were being harvested were also determined. Samples of sediment and biota were collected from five stations between May and October, 2016: Station 1 (Eagle Cement waterfront), Station 2 (Saipem waterfront), Station 3 (Master energy waterfront), Station 4 (Agip waterfront) and Station 5 (Ogbakiri waterfront). Metal concentrations were determined using GBS Avanta AAS. The mean concentration of Cd in the tissue was higher than the WHO (2000) MPL of 0.5mg/kg. The mean concentration of Ni in the tissue also exceeded the WHO (2000) MPL of 0.5- 0.6mg/kg. The HQ determined for Cd was higher than the USEPA (2012) RfD of 0.001 in all the stations. The HQ of Ni also exceeded the USEPA (2011) RfD except in station 5 where it was less. The Health Index (HI) was greater than 1 meaning that the consuming population are at risk of health problems associated with Cd and Ni as individual metals and their additive effect. The PLI were in the following descending order station 5 > 1 > 4 > 2 > 3. It means that station 5 was more polluted than other stations based on the ratio of the pollutant (Cd and Ni) in the biota to sediment.