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Now showing items 21-29 of 29
Spatial and temporal assessment of atmospheric organic carbon and black carbon concentrations at South African DEBITS sites
(2014)
The baseline of uncertainty in aerosol radiative forcing is large and depends on aerosol characteristics (e.g. size and composition), which can vary significantly on a regional scale. Sources (natural and anthropogenic) ...
Spatial and temporal deposition of selected biogeochemical important trace species in South Africa
(North-West University, Potchefstroom Campus, 2018)
The concern of potential adverse environmental effects due to increased anthropogenic emissions to
the atmosphere necessitates the need for long-term atmospheric deposition programmes. Wet and dry
depositions of emitted ...
The impact of raw material selection on damring formation and pre-reduction during ferrochrome production
(North-West University, 2018)
Electricity consumption is the largest cost component in the production of ferrochrome (FeCr). Currently the pelletised chromite pre-reduction process (solid-state reduction of chromite) is the process option with the ...
Volatile organic compound measurements at a grazed savannah grassland in South Africa
(North-West University (South Africa), Potchefstroom Campus, 2016)
Various gaseous and aerosol species that are emitted directly from anthropogenic and biogenic
sources, as well as secondary formed species, are present and mixed in the giant reactor of the
atmosphere, where multiple ...
Assessment of atmospheric trace metals and water soluble ionic species at two regional background sites
(North-West University (South Africa), Potchefstroom Campus, 2015)
In this study, atmospheric trace metals and water soluble ionic species were
investigated. Five research articles are presented. In the first two articles specific trace
metals species, i.e. mercury and hexavalent chromium, ...
Cr(VI) contamination of aqueous systems
(North-West University (South Africa), 2016)
Hexavalent chromium, i.e. Cr(VI), is a potential pollutant species formed due to anthropogenic
processes, e.g. leather tanning, Cr(VI) chemical production, stainless steel manufacturing and
ferrochrome production. Cr(VI) ...
Wet deposition at a regional background site in South Africa : influence of air mass origin and rain intensity on chemical composition on chemical composition
(North-West University (South Africa), Potchefstroom Campus, 2017)
The chemical composition of rainwater is an integral aspect of atmospheric chemistry. Wet deposition gives a good indication of the general ambient air quality and contributes to the understanding of the temporal and spatial ...
Long-term measurements of concentration and dry deposition of atmospheric inorganic gaseous species at Cape Point, South Africa
(North-West University (South Africa), Potchefstroom Campus, 2016)
Atmospheric aerosols and trace gases are emitted into the atmosphere by various anthropogenic and natural sources, which are removed through chemical transformation, as well as wet- and dry deposition. These atmospheric ...
Temporal assessment of atmospheric trace metals in the industrialised western Bushveld Complex
(North-West University, 2011)
The presence of trace transition metal species in the atmosphere can be attributed to
the emission of particulate matter into the atmosphere by anthropogenic activities, as
well as from natural sources. Trace metals ...