Sources, distribution, and risk assessment of organochlorine pesticides in Nairobi City, Kenya

The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SPMDs). The SPMDs were extracted by dialysis using n-hexane, followed by cleanup by adsorption chromatography on silica gel...

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Bibliographic Details
Published in:Journal of environmental sciences (China) 2020-10, Vol.96, p.178-185
Main Authors: Lisouza, Fred Ayodi, Owuor, P. Okinda, Lalah, Joseph O.
Format: Article
Language:English
Subjects:
Organochlorine pesticides (OCPs)
Passive sampling
Risk assessment
Sources and distribution
Water-air fugacity ratio
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Summary:The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SPMDs). The SPMDs were extracted by dialysis using n-hexane, followed by cleanup by adsorption chromatography on silica gel cartridges. Sample analysis was done by GC-ECD and confirmed by GC–MS. Separation of means was achieved by analysis of variance, followed by pair-wise comparison using the t-test (p≤ 0.05). The total OCPs ranged between 0.018 – 1.277 ng/m3 in the air and Kibera > Industrial Area > City Square > Ngong’ Forest. However, these were lower than the USEPA acceptable risks, 10−6 – 10−4. This study concluded that atmospheric OCPs did not pose significant cancer risks to the residents. [Display omitted]
ISSN:1001-0742
1878-7320
DOI:10.1016/j.jes.2020.04.046