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Abstract
Cosmetic and personal care products are used throughout the world in large quantities. Siloxanes are commonly used in the formulation of these products. The use of these products releases siloxane into the environment. This study quantifies for the first time in Africa specifically in Lagos Nigeria, the amount of two cyclicvolatile methylated siloxane (cVMS) compounds namely octamethylcyclotetrasiloxane (D4) and decamethylcyclopentasiloxane (D5) in wastewater and sludge from industries, water, sediments and fishes from the Lagoon. The samples obtained were extracted and analyses were performed using gas chromatography-mass spectrometry (GC-MS). Results showed higher concentrations of D5 compared with D4 across all sample types. Using the estimated daily intake (EDI) and hazard quotient (HQ) to assess the health risks showed minimal risk to adults and children consuming fish from the lagoon. However, biota-sediment accumulation factor (BSAF) and bioaccumulation factor (BAF) exceeded their benchmark values of 1.7 and 5000 respectively for most of the fishes at all the sites showing bioaccumulation potential at these sites for D4 and D5. This study underscores the need for sustainable practices to mitigate cVMS contamination in Nigeria's aquatic systems.
Published Version
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