Environmental & Analytical Toxicology

Hlengilizwe Nyoni

Publications

• Research Article
  In Situ Measurement of Time-Weighted Average Concentrations of Cylindrospermopsin and Microcystin LR-YR-RR-LY in Natural Waters Using Silicone-Membrane/Γ-Fe2O3- Nanoparticle-Sorbent Passive Sampling Device
  Author(s): Hlengilizwe Nyoni, Bhekie B Mamba and Titus AM MsagatiHlengilizwe Nyoni, Bhekie B Mamba and Titus AM Msagati
  
  Preliminary use of performance reference compounds (PRC) spiked into the silicone-membrane/γ-Fe2O3 sampler for in situ calibration has been demonstrated to improve the quantitative nature of water concentration estimates. Hydrophobic polycyclic aromatic hydrocarbons (PAHs), though they occur at significant levels in the environment, were used as PRC because of their relatively high fugacity from the silicone membrane and evidence of their isotropic exchange kinetics. In situ calibrations of silicone-membrane/γ-Fe2O3 sampler spiked with 16 PAHs and the resulting time weighted average (TWA) concentration estimates were compared with similar values of SPE extracts from grab samples. Calibration studies were successfully done and variable environmental conditions (e.g. effects of hydrodynamics and temperature) were found to affect their elimination rates from silicone-membrane/&.. Read More»
  

  Abstract PDF