Using GIS to understand the environmental chemistry of manganese contaminated soils, Kgwakgwe area, Botswana

Type Journal Article - Journal of Applied Sciences and Environmental Management
Title Using GIS to understand the environmental chemistry of manganese contaminated soils, Kgwakgwe area, Botswana
Author(s)
Volume 9
Issue 2
Publication (Day/Month/Year) 2005
Page numbers 37-42
URL https://tspace.library.utoronto.ca/bitstream/1807/6451/1/ja05042.pdf
Abstract
This study aimed at establishing the spatial distribution of manganese (Mn) and iron (Fe) within
the periphery of a manganese oxide (Mn oxide) ore abandoned mine. Four hundred soil samples were obtained
from a 4 km2
area close to the Kgwakgwe Mn oxide ore abandoned mine, Kanye, South eastern Botswana. The
determination of Fe and Mn concentrations after acid digestion of samples was performed on a Varian Spectra
AA-220 FS atomic absorption spectrometer (Varian, Australia) equipped with a deuterium background correction.
Laboratory results were processed using Geographical Information Systems (GIS), and Remote Sensing (RS)
techniques with the integrated Land and Water Information System (ILWIS), Geosoft Oasis Montaj and ArcGIS
software packages. Microsoft Excel was used for statistical and graphical presentation of data analyses. The range
of concentration levels of Fe in soils was from 1116 μg g-1 to 870766 μg g-1 with a mean of 17593 μg g-1 and for
Mn in soils was 35 μg g-1 to 24907 μg g-1 with a mean of 1088 μg g-1. The gridded soil maps for Fe and Mn show
anomalies in different parts of the study area. Where Mn is high, the Fe is low and vice versa. Manganese was high
at the mine workings and in the northwestern part of the study area. Iron on the other hand is very low in the mine
working area and is high on the northern part of the study area. Suggestions are advanced for the Mn interplay in
the soils and environment around the Kgwakgwe abandoned Mn oxides ore mine.

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