| dc.description.abstract | Air pollution studies in Nairobi are indicating a rising trend in the particulate matter loading. The trend is
mainly attributed to increased volume of motor vehicles, the physical change of the environment,
agricultural and industrial activities. In this study, total suspended particulate matter sampling at the
Nairobi industrial area and inside one workplace are reported. Included also are the results of analysis of
water samples and effluents collected from a sugar factory, a tannery, and mercury(Hg) analysis in some
beauty creams sold in Nairobi.
The samples were analysed for heavy metal content using Energy Dispersive X-ray Fluorescence
(EDXRF) while the suspended particulate matter (SPM) concentrations were determined by gravimetric
technique. Total reflection x-ray fluorescence(TRXF), atomic absorption spectrophotometry and PIXE
analytical techniques plus the use of Standard and Certified Reference Materials(SRM's and CRM's) were
used for quality control, analysis and evaluation of the accrued data.
Air sampling in the industrial area was done twice(Wednesday and Saturday) every week for a period of
two months(November and December, 1996) and twice monthly for a period of six months (January-June
1997). Each sample covering approximately 24 hours, was collected using the 'Gent' Stacked Filter Unit
(SFU), for day and night times. The SPM were found to vary from 16 to 83 mgnr3 during the sampling
period.
The analysis of dust collected inside a workplace showed that there was poor filtration of the air pumped
into the building and that there was a need for improvement of the air conditioning unit plus reduction of
emissions from a neighbouring tyre factory. | en_US |
