American Journal of Environmental Protection
ISSN (Print): 2328-7241 ISSN (Online): 2328-7233 Website: http://www.sciepub.com/journal/env Editor-in-chief: Mohsen Saeedi, Hyo Choi
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American Journal of Environmental Protection. 2019, 7(2), 41-51
DOI: 10.12691/env-7-2-2
Open AccessArticle

Assessment of Public Health Risks of Heavy Metals Pollution in River Sosiani Catchment

Ogara Rose Shieunda1, , Edward Neyole1, Stanley Omuterema2 and Francis Orata3

1Department of Disaster Preparedness and Engineering Management, Masinde Muliro University of Science and Technology

2Department of Disaster Management and Sustainable Development, Masinde Muliro University of Science and Technology

3Department of Pure and Applied Chemistry, Masinde Muliro University of Science and Technology

Pub. Date: October 09, 2019

Cite this paper:
Ogara Rose Shieunda, Edward Neyole, Stanley Omuterema and Francis Orata. Assessment of Public Health Risks of Heavy Metals Pollution in River Sosiani Catchment. American Journal of Environmental Protection. 2019; 7(2):41-51. doi: 10.12691/env-7-2-2

Abstract

The objective of the study was to assess public health risks of heavy metals pollution in river Sosiani Catchment. This study was a multiple design approach whereby both experimental and socio-economic survey was done to obtain data. The units of analysis used in the socio-economic phase of the study were a random sample size of 402 WRUA members while the scientific phase of the study included two species of fish and water. Water was sampled from eleven sampling locations (SR0 – SR10) and fish from ten sampling points (SR1 – SR10) along river Sosiani. Data for the WRUA members was obtained through weighing and questionnaire analysis. Data for water and fish was obtained using AAS. Data analysis was done using the statistical program for social sciences (SPSS) version 23. The inherent public health risks from heavy metal exposure were determined using THQs for the respective heavy metals and HI which summed up the individual THQs. During the wet season, THQs for water revealed that all sites showed no potential risk for lead, only one site; Naiber exhibited the high risk values for cadmium and three sites, registered very high THQs way beyond the threshold of 1 for chromium. Two sites (Nairobi bridge and Kisumu bridge) had HI values above the limit of 3. During the dry season,both lead and cadmium showed very low THQ values for water, indicating no risk potential. Only chromium had high THQ values in five sites indicating high health risks. The trend was similar for the wet season for HI. An analysis of the risks from fish consumption of Barbus and catfish for both seasons showed that within the entire catchment and based on the received responses, the public health risk from fish consumption is very low with THQs being way below the threshold value of 1 for all the heavy metals (Pb, Cd and Cr). An evaluation of risks as exhibited by manifestation of symptoms within the catchment indicated that most of the inhabitants were symptomatic. Basically, it is concluded that water from river Sosiani had higher THQ and HI values and hence higher risk values than both the fish species. This rendered water from this location unfit for human consumption. The study recommends that urgent measures like pollution control through enforcement of the Kenyan regulations and proper engineering guidance for drainages and wastewater treatment plants will reverse and eventually stop this trend. The communities are also supposed to be sensitised and encouraged not to use river water for domestic use.

Keywords:
lead chromium. Cadmium heavy metals river Sosiani

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