Includes bibliographical references. / The term atmospheric haze is a condition of reduced visibility, caused by the presence of fine particulate matter in the atmosphere, which can originate from natural or anthropogenic sources. The "Brown Haze" is a phenomenon that is associated with Cape Town and can be described as brown coloured smog. It occurs over the winter months, mainly May to September, due to the strong temperature inversions and windless conditions that can occur during these months. These conditions lead to the build-up of pollutants emitted into the atmosphere. The Cape Town Brown Haze Phase Two study was used to obtain a detailed analysis of the atmosphere in a programme of lateral and vertical profiles through the Brown Haze. The field campaign took place from the 29th July 2003 to the 26th August 2003 around the Cape Town metropolitan region.

Includes bibliographical references. / Coal mining in the Highveld region of Mpumalanga Province, South Africa generates between 14 and 30 million litres of waste water per day. Much of the water is saline (TDS> 2500 mg/I) and has high concentrations of dissolved SO₄²⁻, Ca²⁺ and Mg²⁺. Crop irrigation has been proposed as a useful way to dispose of saline mine water and enhance agricultural productivity in this low rainfall (˂800 mm/year) region. In order to avoid undesirable salinization of the regional groundwater, it is necessary that soils immobilize, at least partially, the dissolved salt load of irrigation water.

Summary in English. / Bibliography: leaves 70-75. / Recent research on the platinum-group elements (PGE) has shown increased concentrations in environmental samples, probably as a result of the widespread use of PGE (Pt, Pd and Rh in particular) as catalysts in the chemical and car industry. Most of the recent research on PGE focuses on the analysis of concentrations in environmental samples exposed to anthropogenic sources of PGE, but there are very few studies that have investigated sorption behaviour of PGE in soils.

Includes bibliographical references. / Large quantities of water are available in the Cape Flats sandy aquifer in the Western Cape. Local industrial, agricultural, domestic and urban development activities are known to be potential polluters of this water through infiltration of wastewater, because of the unconfined nature of the aquifer. In order to determine the potential of the water in the aquifer, fifteen water samples from the Cape Flats were analysed and geochemically assessed prior to their qualify being evaluated in terms of future use in domestic, irrigation and industrial activities.

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