3 research outputs found
An air quality assessment in the industrialised western Bushveld Igneous Complex, South Africa
South Africa has the largest industrialised economy in Africa, with significant mining and metallurgical activities. A large fraction of the South African mineral assets is concentrated in the Bushveld Igneous Complex (BIC), with the western limb being the most exploited. Because the majority of the world's platinum is produced in the BIC, this area is also of international interest. There are some indications that the western BIC should be considered an air pollution hotspot; however, inadequate data exist to substantiate these claims scientifically. To partially address this knowledge gap, a comprehensive air quality monitoring station was operated for more than 2 years in this area. Meteorological parameters, trace gas concentrations and total mass concentration of particulate matter up to 10 µm in size (PM10) were measured. Compared with South African and European ambient air quality standards, SO2, NO2 and CO concentrations were generally acceptable. The major sources of SO2 were identified as high-stack industry emissions, while household combustion from semi-formal and informal settlements was identified as the predominant source of NO2 and CO. In contrast, O3 exceeded the 8-h moving average more than 322 times per year. The main contributing factor was identified to be the influx of regional air masses, with high O3 precursor concentrations. PM10 exceeded the current South African 24-h standard 6.6 times per year, the future (2015) standard 42.3 times per year and the European standard more than 120 times per year. The main source of PM10 was identified as household combustion from semi-formal and informal settlements. The findings clearly indicate that atmospheric O3 and PM10 levels in the western BIC need to be addressed to avoid negative environmental and human health impacts
Assessment of atmospheric trace metals in the western Bushveld Igneous Complex, South Africa
Trace metal species emitted into the atmosphere from natural and anthropogenic sources can cause various
health-related and environmental problems. Limited data exist for atmospheric trace metal concentrations in
South Africa, which has the largest industrialised economy in Africa, with significant mining and metallurgical
activities. A large fraction of these mineral assets is concentrated in the Bushveld Igneous Complex, with the
western limb being the most exploited. To partially address this knowledge gap, atmospheric trace metals
were collected in the western Bushveld Igneous Complex at Marikana in the North West Province. Diurnal
PM
2.5
and PM
10
samples were collected for 1 year. A total of 27 trace metal species were determined.
With the exception of Ni, none of the trace metals measured during the sampling period exceeded local or
international air quality standard limit values. Total trace metal concentrations in the PM
10
fraction peaked
during the dry months and were regularly washed out during the wet season. A less significant seasonal
trend was observed for the trace metal concentrations in the PM
2.5
fraction; a finding attributed to a faster
replenishment of smaller particles into the atmosphere after rain events. About 80% of the PM
10
trace metal
levels measured occurred in the PM
2.5
fraction, while 40% or more of all metals emanated from the PM
2.5
fraction. This finding indicated a strong influence of anthropogenic sources. Four meaningful emission
sources were determined from explorative principal component factor analysis: crustal, vanadium related,
base metal related and ferrochromium related, which correlated well with the anticipated atmospheric trace
metal sources in the region