Polychlorinated Biphenyls (Pcbs) in Soil in Ondo State, Nigeria

Abstract

Polychlorinated biphenyls (PCBs) adhere to soil particles and persist there for a considerable amount of time. Their near proximity might expose people by ingesting, inhalation, and skin contact, which could have neurotoxic, mutagenic, and cancerous health effects. In Okitipupa, Ondo State, Nigeria, this investigation measured the level of PCBs in soil at five different sites. A GC paired with an ECD detector was used to evaluate the sample. Concentrated H2SO4 was used to clean the extracts. According to the study's findings, the average concentration of PCB congeners at the different sites was 5.364 g/kg, with a range of 0.150 to 13.30 g/kg. Recovery rates for specific PCB congeners ranged from 87% to 100%. The number of polychlorinated biphenyls (PCBs) in the soil was higher than the 0.050 mg/kg WHO acceptable limit. TetraPCB and triPCBs have a strong positive connection. The correlation between the soil's pH and total PCBs was positive and strong (r = 3.95) while the correlation between the soil's EC and total PCBs was negative and strong (r = -0.411). The estimated daily intake (EDI) ranged from 3.0* 10-7 to 6.0* 10-7 incremental lifetime cancer risk (ICLR) ranged from 2.0* 10-6 to 4.0* 10-6. While the quotient hazard (QH) values varied from 9.0* 10-4 to 2.0* 10-3, The EDI, ICLR and QH were within USEPA tolerable risk limit