RESUMO
This study assessed the seasonal distribution of trace metals in soft tissues of Tympanotonos fuscatus var radula, surrounding water, and sediment of Abule-Agege Creek in Southwest Nigeria. A non-significant variation (p > 0.05) in water physicochemical parameters occurred across wet and dry seasons. Metallic contamination (Copper, zinc, mercury, chromium, lead and cadmium) was found to be higher in T. fuscatus var radula than in water, and the sediment serves as a large depository of these trace metals. In this gastropod, the ability of metal accumulation from water (Bio-water accumulation) was higher than that from sediment (Bio-sediment accumulation). In addition, the linear regression models revealed positive relationship between tissue and sediment concentrations of lead and cadmium for both seasons. The estimated daily intake of investigated metals for both seasons was lower than the oral reference dose, while the target hazard quotient and total hazard index of individual metals were both less than 1, meaning that T. fuscatus var radula from the study region posed no health risk.
