Leachate analysis of two waste dumpsites in Pretoria, South Africa

Improper waste management practices may increase concentrations of noxious chemicals in leachate. This study analysed concentrations of trace metals in leachate collected from two waste dumpsites in Pretoria, South Africa. An open ended questionnaire was implemented to managers to gather information on management options. Leachate samples were collected in triplicates from leachate ponds and stored below 10°C. Trace metal contents from samples were analysed using inductively coupled plasma mass spectrometry-7700 (ICP-MS-7700). Significant differences in the concentrations of trace metals were analysed using the student t-test. Both sites lacked leachate collection and treatment systems and official recycling programmes. The levels of lead (Pb), manganese (Mn), chromium (Cr), mercury (Hg), arsenic (As) and nickel (Ni) were above the recommended limits. Significant differences in trace metal concentrations were established at both dumpsites. Proper waste management can reduce concentrations of trace metals levels and environmental contamination.