Heavy metal concentrations in periwinkle (Litorina L ittorea) and tilapia (Tilapia Zilli) from the coastal water of Warri, Nigeria

Abstract

Heavy metal (HM) contents in periwinkle and tilapia from Warri coastal water were carried out during dry and wet seasons of 2008 and 2009. Samples were collected from ten sampling locations. HM was determined using atomic absorption spectrophotometer-varian model spectral AA 220. The range of HM concentrations viz Pb, Ni, Fe, Cu, Zn, Cd, Mn and Cr in periwinkle were found to be 0.68-10.34mg/kg, 1.21-8.01mg/kg, 198.73-457.11mg/kg, 0.002-4.60mg/kg, 1.02-5.06mg/kg, 0.002-0.54mg/kg, 10.00-72.27mg/kg and 205.09-1,453mg/kg respectively. In tilapia, the concentrations ranged from 0.73-3.25mg/kg, 0.72-482.00mg/kg, 0.001-1.93mg/kg, 3.02-459.00mg/kg, 0.83-3.75mg/kg, 0.65-1.45mg/kg,1.25-5.01mg/kg and 344.02-969.00mg/kg respectively. The results show that Fe, Mn and Cr in periwinkle and only Cr in tilapia were higher than other metals determined. The concentrations of heavy metals during wet season were slightly higher than dry season except in few occasions. Also, the heavy metal concentrations of the year 2009 were generally higher than the year 2008 indicating more of these metals were discharged or introduced into water/sediment environment than the previous year which enhanced bio-accumulation in these fauna. These generally suggest an evidence of these fauna to bio-concentrate these metals.

Heavy metal profiles in various matrices of the Bonny/New Calabar River Estuary, Niger delta, Nigeria

“…Furthermore, some of the factors may include, age of fish, lipid content in the tissue and mode of feeding are significant factors that affect the accumulation of heavy metals in fishes. Similar studies have reported similar bioaccumulation patterns of metals in different organisms in the Bonny/New Calabar River Estuary (Chindah et al 2009;Davies et al 2006) and elsewhere in the Niger Delta (Olowoyo 2011) and River Benue (Eneji et al 2011). …”

Fractionation of Fe, Zn, Cu and Health Risk Appraisement in two Terrestrial and Aquatic Snails Commonly Consumed in Nigeria

“…However, the mean concentrations of Zn in these snails were lower than the recommended standard limits of regulatory bodies presented in Table 1. These values were higher than the value obtained by Olowoyo, 36 in periwinkles and tilapia, and the value reported by Chindah et al, 20 in periwinkles. Zinc plays ubiquitous biological roles in the human system.…”

“…Also, Fe levels in these snails are higher than the values reported by Ibe et al, 35 which were 0.950 mg kg -1 and 2.061 mg kg -1 in catfish and tilapia. However, the Fe levels in some fractions (especially the polar (PMF) and non-polar (NHF) are lower than the range values of 198.73-457.11 mg kg -1 reported by Olowoyo, 36 in periwinkles except in the residual fraction (RSF).…”

Heavy metals contamination of seafood from the crude oil-impacted Niger Delta Region of Nigeria: A systematic review and meta-analysis

“… [68] Olowoyo2010 Warri Coastal Water /Delta State AAS - Pb (0.002–8), Ni (0.01–3.5), Fe (0.002–1.61), Cd (0.009–18.13) mg/kg dry wt. [69] Ogunola2017 Okrika /Rivers State ICP-AES 48 Cr (3.4–4.06), Cu (1.11–16.32), Fe (148 −225.86), Ni (0.47–1.57), Zn (9.24–50.41) mg/kg dry wt. [70] Nkpaa2016 Kaa, B-Dere, Bodo in Gokana and Khana Local Government Area, Ogoniland /Rivers State AAS 120 Cr ( 2.9–9.98), Cd (0.52–1.8), Pb (7.01–31), Zn (23–46), Mn (8.67–60.9), Fe (293–1040) mg/kg wet wt.…”