Browsing by Author "Beukes, J.P."
Now showing items 1-20 of 89
-
The AeroCom evaluation and intercomparison of organic aerosol in global models
Tsigaridis, K.; Beukes, J.P.; Tiitta, P.; Van Zyl, P.G.; Daskalakis, N. (EGU, 2014)This paper evaluates the current status of global modeling of the organic aerosol (OA) in the troposphere and analyzes the differences between models as well as between models and observations. Thirty-one global chemistry ... -
Aerosol optical properties at a savannah grassland site in South Africa
Venter, Marcell (North-West University (South Africa), 2020)Atmospheric aerosols affect the earth’s radiative budget in two ways: firstly, particles directly absorb and scatter short- and long-wave radiation and, secondly, particles indirectly influence the lifetime and physical ... -
Air quality assessment of the industrialized western Bushveld Igneous Complex
Venter, Andrew Derick (North-West University, 2011)South Africa has the largest economy in Africa, with significant mining and metallurgical activities. A large fraction of the mineral assets is concentrated in the Bushveld Igneous Complex (BIC), with the western limb ... -
Air quality in the Johannesburg–Pretoria megacity : its regional influence and identification of parameters that could mitigate pollution
Lourens, Alexandra Susanna Maritz (North-West University, 2012)A megacity is generally defined as a city that, together with its suburbs or recognised metropolitan area, has a total population of more than 10 million people. Air pollution in megacities is a major concern due to large ... -
Alteration of chrome-to-iron ratio in chromite ore by chlorination
Neizel, Bryson Wade (North-West University, 2010)The industrial importance of the chromium industry to South Africa is emphasised by the fact that it is considered the largest chromite (chromium ore) and ferrochrome (chrome-iron alloy) producing country in the world. ... -
Ambient aromatic hydrocarbon measurements at Welgegund, South Africa
Jaars, K.; Beukes, J.P.; Van Zyl, P.G.; Venter, A.D.; Josipovic, M.; Pienaar, J.J.; Tiitta, P.; Laakso, L. (EGU, 2014)Aromatic hydrocarbons are associated with direct adverse human health effects and can have negative impacts on ecosystems due to their toxicity, as well as indirect negative effects through the formation of tropospheric ... -
Ambient mercury concentrations at industrially influenced sites on the Highveld
Meyer, Rean (North-West University (South Africa), 2019-05)Mercury (Hg) is a toxic atmospheric pollutant that has the ability to bio-accumulate in the aquatic food chain, leading to animal and human exposure. During this study, assessments of ambient Total Gaseous Mercury (TGM) ... -
The anthropogenic contribution to atmospheric black carbon concentrations in southern Africa: a WRF-Chem modeling study
Kuik, F.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Laakso, L.; Lauer, A.; Vakkari, V. (EGU, 2015)South Africa has one of the largest industrialized economies in Africa. Emissions of air pollutants are particularly high in the Johannesburg-Pretoria metropolitan area, the Mpumalanga Highveld and the Vaal Triangle, ... -
Applicability of analytical techniques to quantify trace metals in particulate matter for source apportionment in South Africa
Van Loggenberg, E. (North-West University (South Africa), 2020)The impacts of atmospheric trace metal species in particulate matter (PM) on human health and the environment is well documented. Rapid advances in the development of analytical techniques used for characterisation and ... -
Aqueous solubility of Cr(VI) compounds in ferrochrome bag filter dust and the implications thereof
Du Preez, S.P.; Beukes, J.P.; Van Dalen, W.P.J.; Van Zyl, P.G.; Loock-Hattingh, M.M. (WRC, 2017)The production of ferrochrome (FeCr) is a reducing process. However, it is impossible to completely exclude oxygen from all of the high-temperature production process steps, which may lead to unintentional formation of ... -
Aqueous solubility speciation of Cr(VI) in ferrochrome bag filter dust
Van Dalen, Willem Petrus Johannes (North-West University, 2015)The production of ferrochrome (FeCr) from chromite ore is a reducing process, whereby the Cr(III) and Fe(II) in the ore are reduced to metallic chromium (Cr) and iron (Fe) in the final product. FeCr is mostly used for the ... -
Assessing atmospheric trace gas concentrations in rural areas of the North West Province
Ngoasheng, M. (North-West University (South Africa), 2020)Anthropogenic activities are increasing the ambient atmospheric concentrations of inorganic gaseous pollutants, which include nitrogen dioxide (NO₂), sulphur dioxide (SO₂), and ozone (O₃). These species were also included ... -
Assessment of atmospheric trace metals and water soluble ionic species at two regional background sites
Venter, Andrew Derick (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, ... -
Atmospheric boundary layer top height in South Africa: measurements with lidar and radiosonde compared to three atmospheric models
Korhonen, K.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Tiitta, P. (EGU, 2014)Atmospheric lidar measurements were carried out at Elandsfontein measurement station, on the eastern Highveld approximately 150 km east of Johannesburg in South Africa throughout 2010. The height of the planetary ... -
Atmospheric SO₂ and NO₂ flux measurements at a savannah-grassland-agriculture landscape in South Africa
Stenden, Franciscus Hubertus (North-West University (South Africa), 2019)Deposition measurements of SO2 and NO2 in South Africa are mainly limited to passive sampling where a constant deposition velocity is assumed for a specific land use category. Gaseous deposition velocities in South Africa ... -
Background ambient atmospheric mercury concentrations for the South African interior
Bredenkamp, Liezl (North-West University (South Africa), 2021)Atmospheric mercury (Hg) pollution is a global health concern. Once emitted into the atmosphere, gaseous elemental mercury (Hg0) can be converted to highly reactive gaseous oxidised mercury (Hg2+), which is deposited to ... -
Characterisation and liberation of chromium from fine ferrochrome waste materials
Van Staden, Y.; Beukes, J.P.; Van Zyl, P.G.; Dawson, N.F.; Du Toit, J.S. (Elsevier, 2014)Three types of generic chromium (Cr)-containing wastes are generated during ferrochrome (FeCr) production, i.e. slag, bag filter dust (BFD) and venturi sludge. Slag is by volume the largest waste; however, fine FeCr waste ... -
Characterisation of air masses passing over the Vredefort Dome world heritage site
Dunn, Marcell (North-West University (South Africa), 2015)In 2007, it was announced that the Vredefort Dome will be proclaimed South Africa’s seventh UNESCO (United Nations Educational, Scientific and Cultural Organisation) world heritage site. It is the largest and second oldest ... -
Characterisation of an industrial Søderberg electrode
Glastonbury, Ralph Ivor (North-West University (South Africa), 2023)Søderberg electrode management (together with the initial design of the electrode system) is commonly considered as one of the most important aspects of profitable and safe submerged arc furnace operation, with some even ... -
Characterisation of sub-micron particle number concentrations and formation events in the western Bushveld Igneous Complex, South Africa
Hirsikko, A.; Tiitta, P.; Beukes, J.P.; Laakso, L.; Vakkari, V. (EGU, 2012)South Africa holds significant mineral resources, with a substantial fraction of these reserves occurring and being processed in a large geological structure termed the Bushveld Igneous Complex (BIC). The area is also ...