METAL POLLUTION INDEX AND GIS MODELLING OF SOME TRACE METALS IN WATER, SEDIMENT AND Lutjanus .......

In the lower reaches of the Qua Iboe river estuary, one of the largest crude oil producing facilities in Nigeria's Niger Delta region is located. It has a history of oil spills and pipeline vandalism, both of which have had serious consequences for the aquatic habitat. The purpose of this research was to calculate the geometric mean of the researched metals in each location, as well as to map trace metal pollution index levels based on sampling data and classify them into risk regions using a geographic information system (GIS). The metal pollution index (MPI) of the analysed metals was calculated using a model proposed by the USEPA, and pollution maps depicting the pollution status of various sampling sites were constructed using Arc map 9.2's GIS modelling technique. In the dry season, the MPI values tested were: water (0.180-0.372), sediment (0.55-2.98), Lutjanus dentatus (0.102-0.295), while in the rainy season, the results were: water (0.027-0.324), sediment (0.65-2.95), Lutjanus dentatus (0.102-0.295). (0.036-0.273). In comparison to the control sites, sampling sites near oil processing facilities had higher total metal content (MPI) values. The pollution map identified very high risk zones near Douglas and Stubbs streams, according to the risk assessment. The presence of anthropogenic pollution sources in these areas can be linked to the findings. As a result, adequate cleanup of the lower Qua Iboe River estuary is suggested to reduce the cumulative health risk from trace metal pollution in the ecosystem.

Please see the link :- https://www.ikprress.org/index.php/JOGEE/article/view/1154