Assessment of Heavy Metals Pollution in Sediments of the Lower Orashi and Sombriero Rivers, Southern Nigeria: A Consensus-Based Sediment Quality Guideline Approach.

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Quasi-experimental analysis reveals heavy metal concentrations exceed guidelines in some sites, suggesting urgent monitoring is needed.

Higher heavy metal concentrations were found in sediments of the Orashi River during the dry season, indicating pollution levels.
Results showed that Cd and Zn concentrations exceeded TEC values at several sampling sites in the Orashi River and some in the Sombriero River.
The study utilized a quasi-experimental design over multiple grids, assessing heavy metals concentrations in both dry and wet seasons.
Regular monitoring of heavy metal pollution is crucial to avoid widespread contamination of river systems, particularly for Zn levels.

Otiasah et al. (2025) studied this question.

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