Modeling and risk assessment of persistent, bioaccumlative and toxic (PBT) organic micropollutants in Lagos lagoon, Nigeria
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Olayinka, K. O.
Alo, B. I.
Science Publishing Group
Lagos lagoon is the major source of seafoods to the people of Lagos and its environs. The presence of PBTs at levels that can pose potential risk to the environment and humans is a matter of concern as these pollutants potentially contribute to many of the modern day diseases including cancer, damage to the reproductive system, disrupted endocrine and immune systems, and neurobehavioral effects etc. Risk assessment of organochlorine pesticides (OCs) and polycyclic aromatic hydrocarbons (PAHs) was carried out in fish and invertebrates at different locations on the lagoon. Phenanthrene posed the highest risk to the aquatic organisms, with RQ values ranging between 1.9744 and 7.8431. Phenanthrene also gave toxic equivalence (TEQ) values of 1.1549 and 1.0975 in blue crabs and carranx hippos respectively. PBT toxicities to non endemic aquatic organisms were predicted from toxicities of surrogate species from Lagos lagoon. Species Sensitivity Distribution (SSD) estimated HC5 values were low, and cumulative probability estimations indicated that the potentially affected fractions (PAFs) of biota by Phenanthrene in the lagoon were reasonably high. Long range transport model revealed that g-HCH could persist for 405.86 days and travel 23,730.53Km from point of release. The risks posed by PBTs in fishes and invertebrates of the lagoon are hereby presented.
Research Subject Categories::NATURAL SCIENCES::Chemistry::Analytical chemistry::Separation methods , Ecological Risk Assessment , Modeling , PBTs , Biota , Lagos Lagoon
Alani, R. A., Drouillard, K. G., Olayinka, K. O., & Alo, B. I. (2012). Modeling and risk assessment of persistent, bioaccumlative and toxic (PBT) organic micropollutants in Lagos lagoon, Nigeria. In Book of proceeding of the chemical society of Nigeri. 35th annual international conference, Owerri, 17-21pp.