The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SP-MDs).The SPMDs were extracted by dialy...The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SP-MDs).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/m^3 in the air andKibera>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.展开更多
基金supported by the National Research Fund,Kenya (No.2015/2016 FY)。
文摘The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SP-MDs).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/m^3 in the air andKibera>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.
