Browsing by Author "Rweyemamu, Almachiusi Rwegasira"

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    Contamination and human health risk due to toxic metals in dust from transport stations and markets in the Kumasi Metropolis, Ghana
    (May, 2019) Rweyemamu, Almachiusi Rwegasira;
    Heavy metals are very harmful to human health and their increasing contamination of dust in the urban areas calls for serious attention to them. The aim of this study was to determine the concentrations and assess the potential human health risk associated with exposure to selected heavy metals in dust from transport stations and markets within the Kumasi metropolis, Ghana. A total of 50 dust samples from transport stations and markets were collected by sweeping ground surface dust and analyzed for Arsenic (As), Cadmium (Cd), Chromium (Cr), Copper (Cu), Nickel (Ni), Lead (Pb), Zinc (Zn), Iron (Fe), Mercury (Hg) and Antimony (Sb). The concentrations of Hg were determined by Atomic Absorption Spectrophotomery using a Lumex RA-915M Zeeman Automatic Mercury Analyzer while the levels of other metals were determined by using X-ray Fluorescence analyzer (Niton XL3t GOLDD+). The concentrations of As, Cd, Cr, Hg, Cu, Ni, Pb, Zn, Fe and Sb in transport stations ranged from below detection to 9.66, below detection to 37.13, below detection to 260.11, 0.01 to 0.62, below detection to 143.77, below detection to 47.62, below detection to 61.73, 48.89 to 218.61, 3768.97 to 40936.07 and below detection to26.01 mg/kg respectively.The concentrations of As, Cd, Cr, Hg, Cu, Ni, Pb, Zn, Fe and Sb in markets ranged from below detection to 6.20, below detection to 14.61, below detection to 232.90, 0.01 to 1.38, below detection to 181.85, below detection to 44.79, below detection to 72.10, 59.29 to 293.68, 8283.66 to 34953.63 and below detection to 21.72 mg/kg respectively. The study revealed no significant difference between the mean concentrations of heavy metals in dust from transport stations and markets at 95% confidence limit of T-test analysis (p>0.05). The mean geo-accumulation, contamination factor and modified degree of contaminations indicated that dust from both transport stations and markets were moderately to extremely polluted by metals compared to their abundance in the dust of the control site v (KNUST Botanic Gardens). Mean enrichment factors indicated that metals were highly enriched in the dust and originated from anthropogenic sources. Pollution load index which ranged from 1.39 to 12.55 for transport stations and from 1.48 to 15.62 for markets revealed high pollution load. The hazard index (HI) and carcinogenic risk index (CRI) were used to assess human health risk. Hazard indices for all the metals were less than the safe limit of 1, signifying no potential non-carcinogenic risk for both children and adults. Exposure to multiple metals was observed as a major concern of non-carcinogenic risk to children. Among the metals assessed for carcinogenic risk, the CRI of Cd in both transport stations and markets exceeded the safe limit of 1x10-4 for children. Health risk assessment indicated children to be highly exposed to heavy metals in dust via ingestion compared to adults. This study observed high pollution load of heavy metals in the studied areas and therefore appropriate measures need to be taken in order to manage the pollution
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    Contamination and Human Health Risk Due to Toxic Metals in Dust from Transport Stations in the Kumasi Metropolis, Ghana
    (Chemistry Africa, 2020) Rweyemamu, Almachiusi Rwegasira; Nkansah, Marian Asantewah; Darko, Godfred; Dodd, Matt; 0000-0001-7157-646X
    The purpose of this study was to assess the contamination levels and human health risk that heavy metals in the dust from transport stations pose to the inhabitants of the Kumasi metropolis, Ghana. Dust samples were collected from 18 transport stations and analyzed for metals including As, Cd, Cr, Cu, Pb, Fe, Sb, Ni, and Zn using X-ray fluorescence spectrometer prior to confirmation on an inductively coupled plasma-mass spectrometer. Mercury concentrations were determined using Lumex RA-915M Zeeman automatic mercury analyzer. The average concentrations of As, Cd, Cr, Cu, Ni, Pb, Fe, Hg, Sb, and Zn were 6, 10, 130, 54, 30, 22, 16,518, < 1, 15 and 120 mg/kg, respectively. All the measured metal concentrations were higher than their background concentrations and the dust were heavily polluted with the metals. Pollution load indices revealed metal pollution was high in the metropolis. However, hazard indices for all the metals across the three exposure pathways were < 1, indicating no non-carcinogenic risk for both adults and children. Exposure to multiple metals was the main potential non-carcinogenic risk to children. Cadmium showed high carcinogenic risk index exceeding the safe limit of 1E0-4 for children, indicating that children are at risk. The study generally observed a higher health risk to children via ingestion compared to adults.