http://hdl.handle.net/11189/3414 Sat, 15 Aug 2026 06:57:08 GMT 2026-08-15T06:57:08Z https://digitalknowledge.cput.ac.za:443/retrieve/27236/ http://hdl.handle.net/11189/3414 http://hdl.handle.net/11189/4919 Title: Polycyclic aromatic hydrocarbons (pahs) in food and environmental samples: an overview Authors: Fatoki, Olalekan S; Ximba, Bhekumusa J; Opeolu, Beatrice O Abstract: Polycyclic aromatic hydrocarbons (PAHs) have been widely reported as a class of ubiquitous chemicals in different matrices. Health implications of these pollutants include carcinogenicity and mutagenicity amongst others. The need for effective measurement techniques of these compounds therefore becomes imperative. This paper reviews sources of PAHs into the environment, exposure routes and effects on humans. Furthermore, an overview of different measurement techniques in environmental and food samples is also presented. Extraction methods that have been applied for PAHs quantification include solidphase extraction (SPE), solid-phase microextraction (SPME), stir bar sorptive extraction (SBSE), liquid-phase microextraction (LPME), liquid-liquid extraction (LLE), accelerated solvent extraction (ASE) and solid-liquid extraction. Most commonly used analytical methods are gas chromatography-mass spectrometry (GC/MS), gas chromatography- flame ionization detection (GC/FID), high performance liquid chromatography-fluorescence detection (HPLC/FD) and high performance liquid chromatography- ultra violet detection (HPLC/UV). Levels reported in different media suggest global need for PAHs monitoring in foods and environmental samples. KEYWORDS: Extraction, analysis, polycyclic aromatic hydrocarbons, food, soil and water. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/11189/4919 2012-01-01T00:00:00Z http://hdl.handle.net/11189/4746 Title: Transfer of knowledge between university and work Authors: Garraway, James; Volbrecht, Terence; Wicht, Merrill Margaret; Ximba, Bhekumusa J Abstract: The paper examines Science intern students’ perceptions of knowledge transfer from university to work. Compared with research on learning at work, the field of transfer between university and workplaces is less well explored. Students were briefed on transfer at their workplaces then asked to submit an account of their own experiences of knowledge transfer. The briefing sessions and the accounts were then examined for emergent trends that may shed light on the extent to which students perceived transfer to be occurring. In short, students may recognize some transfer of knowledge and procedures with limited learning or they may extend and develop more general learning into specific learning at work, often providing original, innovative contributions to work practice. Contributions to work were seen as ideal transfer tools or boundary objects. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/11189/4746 2011-01-01T00:00:00Z http://hdl.handle.net/11189/4735 Title: Spectrophotometric determination of iron (III) in tap water using 8-hydoxyquinoline as a chromogenic reagent Authors: Adebayo, Basheer K; Ayejuyo, Segun; Okoro, HK Abstract: A simple, rapid and sensitive spectrophotometric method was developed for the determinationation of trace amounts of iron (III) using 8-hydroxyquinoline as a chromogenic reagent. The proposed method was based on the reaction of iron (III) with 8-hydroxyquinoline in chloroform solution to form a metaloxine complex having a maximum absorption at 359 nm. Beers law was obeyed in the range of 1 to 14 ug/ml Fe3+. The recovery was between 98.60 and 103.30% with a coefficient of variation of 1.209%. The method was successfully applied to tap water samples and comparison with standard method showed the new method to be accurate and precise as the more sophisticated AAS commonly used for Fe determination. Sat, 01 Jan 2011 00:00:00 GMT http://hdl.handle.net/11189/4735 2011-01-01T00:00:00Z http://hdl.handle.net/11189/4581 Title: Geochemical assessment of sediment in cape town harbour, south africa Authors: Okoro, HK; Fatoki, Olalekan S; Adekola, Folahan A; Ximba, Bhekumusa J Abstract: Geochemical assessment of marine sediments collected from Cape Town harbour was carried out using inductively coupled plasma-mass spectrometry, Fourier-Transform-infrared and X-ray diffractrometry techniques. The clay mineral phase consists of biotites, kaolinites and halites. The ranges of concentrations (mg/kg) of trace metals were: Cd (1.69±0.075 – 0.080±0.002), Si (0.37±0.11 – 0.023±0.012), Fe (30.01±2.04 – 2.23±0.12), Cu (1462±39 – 1.51±0.11), Al (19.92±2.24 – 1.25±0.13), Sn (63.98±4.97 – 1.15±0.38), Pb (252±29 – 8.73±1.06), Hg (1.002±0.168 – 0.049±0.005) and Zn (1.26±0.07 – 0.022±0.004) mg kg-1. The enrichment factors of Sn, Pb, Zn, Fe, Cd, Al and Hg revealed anthropogenic inputs of these metals into the marine environment. The enrichment factor of Cu was less than 1 and this suggests that its presence was largely due to natural changes. The results are indications of the contributions of trace metals contained in the runoffs from the domestic and urban drains, as well as the inflow storm water. Ship repair activities appeared to constitute a major factor responsible for the higher metal contamination in the dockyard areas. The geomineral analyses revealed the presence of quartz, pyrite, and calcite and carrolite minerals as the main constituents of the marine sediments. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/11189/4581 2014-01-01T00:00:00Z