Heavy Metal Concnetrations in Sediment and Periwinkle -Tympanotonus fuscastus in the Different Ecological Zones of Bonny River System, Niger Delta, Nigeria

Abstract

Studies of total hydrocarbon concentrations (THC) and heavy metals was conducted at the Bonny /New Calabar River in order to determine the level of these contaminants (from municipal and industrial sources) on sediment and important biological organism in the environment in September 2000 for wet and January 2001 for dry seasons. The study area is within the eastern arm of the Niger Delta located between longitude 40 25" to 40 40" N and latitude 70 25" to 70 15" E. In the 3 ecological areas studied, the distribution of THC was found to be higher in dry season (411.53 ± 118.77 mg/l than wet (400 ± 375.50 mg/l). Similarly differences were found in the heavy metals distribution in the river system. The magnitude was in the decreasing order of Zn > Cu > Pb > V>Cd>Cr>Cd respectively. This pattern was consistent for all the ecological zones. Bioaccumulation studies also showed that the Tympanotonus fuscatus tissue had more THC and metal contaminants than the sediment. Although the heavy metal values obtained were less than the regulatory standards, the continued accumulation of the contaminants is a cause for concern. THC in both sediment and tissue are high enough to affect the quality of the organism for human consumption.

Distribution and Potential Environmental Risks of Heavy Metals in Riverine Sediments of Maa-Dee-Tai River in Sogho Community, Ogoniland, Rivers State, Nigeria

“…This assessment revealed that the concentration of Ni is below those in New Calabar River, Rivers State of Nigeria, where its value is 4.537±0.427mg/Kg but above those of Bodo Creek [50,51]. However, Maa-Dee-River shows no significant difference with other rivers within Niger Delta [55,56]. It is lower than the permissive limit for Ni set by DPR.…”

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

“… [80] Chindah2009 Bonny and New Calabar River /Rivers State ICP-AES - Cr (0.002–0.130), Cd (0.0005–0.014), Pb ( 0.009–0.075), Zn (0.294 – 3), Cu (0.63–8.78) mg/kg wet wt. [81] Adebayo-Tayo2010 Itu and Oron Creeks (Oron, Itu LGA) /Akwa Ibom State AAS 120 Fe (17.2 – 22.7), Zn (24.4 – 94.2), Pb (0.28 – 0.84), Cd (0.02 – 0.15), Mn (24.2 – 88.6), Cu (3.4 – 7.4) mg/kg wet wt. [82] Woke2016 Andoni River (Khana LGA) /Rivers State AAS 30 Cd (0.01–0.04), Cu (25 – 30), Pb (0.2–0.55), Zn (22 – 42) mg/kg dry wt.…”

The South African pig carcass classification system.

“…Geen statisties betekensivolle verskille (p > 0.05) het voorgekom tussen die gemiddelde konsentrasies in die seesterre vanaf die verskillende lokaliteite nie. Die massa-op-massa-BAF vir Cd was 3256 wat daarop dui dat akkumulering sterk in die seesterre plaasgevind het indien dit byvoorbeeld met die waardes vergelyk word watChindah et al (2009) vir Gastropoda in die Niger Delta bepaal het. Die seisoenale gemiddelde konsentrasies vir die baai self het gewissel van 0.12 µg/L in die winter van 2000 tot 1.48 µg/L in die daaropvolgende herfs van 2001.…”