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British Journal of Applied Science & Technology, ISSN: 2231-0843,Vol.: 17, Issue.: 3

Original-research-article

Measurement of the Level of Some Heavy Metals in Fall-out Dusts at Rehoboth Town, Hardap Region, Namibia

 

S. A. Onjefu1*, N. Hamatui2 and J. Abah3

1Department of Natural and Applied Sciences, Namibia University of Science and Technology, Private Bag, 13388, Windhoek, Namibia.

2Department of Health Sciences, Namibia University of Science and Technology, Private Bag, 13388, Windhoek, Namibia.

3Department of Mathematics, Science and Sport Education, University of Namibia, Katima Mulilo Campus, Private Bag, 1096, Namibia.

Article Information
Editor(s):
(1) Jesús F. Arteaga, Department of Chemical Engineering, Physical Chemistry and Organic Chemistry, University of Huelva, Spain.
Reviewers:
(1) Angélica Rodríguez Dorantes, Instituto Politécnico Nacional, México City, México.
(2) Miguel Angel Sogorb, Universidad Miguel Hernández de Elche, Spain.
Complete Peer review History: http://www.sciencedomain.org/review-history/16022

Abstracts

Aims: To determine the levels of heavy metals in fall-out dust from Rehoboth town, Hardap region, Namibia.

Study Design: Modified open bucket samplers were used to collect the settleable particulate. Six “ordinary” open buckets were placed at different locations (Blocks A to F). In Rehoboth town. Each bucket’s contents were filtered using a Buchner funnel connected to the diaphragm vacuum pump. The residues collected after the filtering were dried and transferred into clean, pre-labelled polyethylene bags and then transported to Analytical Laboratory Services, Windhoek Namibia, for further processing and analyses.

Place and Duration of Study: Rehoboth town, Hardap region, Namibia, between September 2015 and December 2015.

Methodology: The samples were digested according to EPA method 3050B for Inductively Coupled Plasma-Optical Emission Spectrophotometer (ICP-OES) analysis. Ten (10) mL of each digestate was taken and mixed with equal volume of matrix modifier and then analysed using ICP-OES (ICP: Perkin Elmer Optima 7000 DV) for the levels of chromium, cadmium, lead, arsenic, manganese, zinc and nickel.

Results: The levels of heavy metals obtained showed the metals’ enrichment of the dust fall ranging between 0.05 – 1.38 Block A; 0.06-37.44 Block B; 0.05-3.43 Block C; 0.05-4.68 Block D; 0.09-1.73 Block E and 0.09-1.56 Block F respectively. This showed very high enrichment for Block B and deficient to minimal, moderate enrichment for Blocks A, C, D, E and F. The results of contamination factors indicated moderate, considerate and highly contaminated dust fall with the heavy metals; which are related to common and input from anthropogenically induced sources. 

Conclusion: Human activities in the town of Rehoboth, Namibia have obviously increased the levels of heavy metals in dust fall-out. The calculation of pollution load index (PLI) clearly points to deterioration of site quality. This obviously is a grave concern following environmental accumulation and non-biodegradation of heavy metal and hence, the need to have all major roads and inter linking street roads to be paved to mitigate the release of dust into the atmosphere.

Keywords :

Fall-out dust; heavy metals; Rehoboth; pollution; suspended particulate matter.

Full Article - PDF    Page 1-11

DOI : 10.9734/BJAST/2016/28436

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