The
Department of Chemistry has recently established a new Isotope Laboratory, dedicated to advancing stable light isotope research and strengthening the university’s analytical capabilities in this specialised field. But what exactly are stable isotopes, and why do they matter? Simply put, stable isotopes are non-radioactive forms of elements that differ slightly in their atomic structure. These subtle differences allow scientists to use them as natural tracers that help uncover the origins, pathways, and transformations of materials in the world around us.
At its core are stable isotopes: non-radioactive forms of elements that differ slightly in their atomic structure. While the difference is subtle, the impact is profound. These isotopes act as natural tracers, allowing scientists to follow the movement and transformation of materials across environmental and biological systems. Using advanced isotope ratio mass spectrometry (IRMS), the lab analyses elements such as carbon, nitrogen, sulphur, hydrogen, and oxygen. This enables a wide range of research – from tracking nutrient cycles in ecosystems and reconstructing animal diets, to identifying sources of water pollution and verifying the authenticity of food products.
The laboratory is equipped with cutting-edge instrumentation, including a Thermo Fisher Delta Q IRMS system, designed for high-precision analysis of solid, liquid, and gas samples. For now, the focus is on solid samples, specifically nitrogen, carbon, and sulphur, as the team establishes robust analytical methods through careful calibration and validation. As capacity and expertise grow, the lab will expand into more complex analyses, including hydrogen and oxygen isotopes.
The laboratory will be operated by a dedicated academic team in the Department of Chemistry, comprising
Dr Legapa Nkabiti, Lecturer in Chemistry;
Dr Dumisani Kama, Senior Lecturer in Chemistry; and
Dr Christo van Staden, Lecturer in Chemistry, who will oversee the instrument and drive the lab’s day-to-day functioning and research outputs. The development of the laboratory has been supported by a collaborative and generous scientific community. Colleagues from institutions across South Africa have shared their expertise and guidance, while international visits to leading isotope laboratories have provided valuable practical insights into building and running a successful facility.
Beyond its technical capabilities, the Isotope Laboratory is already proving to be a hub for collaboration. Researchers from across the university are partnering with the lab to explore applications in fields such as ecology, zoology, geology, and environmental science. These collaborations are enabling innovative studies – from understanding animal diets and tracking wildlife movements to investigating ecosystem dynamics.
The laboratory promises to play an important role in fostering interdisciplinary research, producing globally relevant data, and addressing locally significant challenges. In doing so, it positions the university at the forefront of isotope science and opens new possibilities for research and impact.