Development of a Silicone-membrane Passive Sampler for Monitoring Cylindrospermopsin and Microcystin LR-YR-RR in Natural Waters

Publication date: Available online 21 October 2016 Source:Physics and Chemistry of the Earth, Parts A/B/C Author(s): Hlengilizwe Nyoni, Bhekie B. Mamba, Titus A.M. Msagati Silicone membrane tubes were functionalised by filling them with synthesised γ-Fe2O3 nanoparticles and used as a passive sampling device for monitoring microcystins and cylindrospermopsin in aquatic environments. This novel device was calibrated for the measurement of microcystin and cylindrospermopsin concentrations in water. The effect of temperature and hydrodynamics on the sampler performance was studied in a flow-through system under controlled conditions. The chemical uptake of microcystins (MCs) and cylindrospermopsin (CYN) into the passive sampler remained linear and integrative throughout the exposure period. The rate of accumulation of most of the MC compounds tested was dependent on temperature and flow velocity. The use of 13C labelled polychlorinated biphenyls as performance reference compounds (PRCs) in silicone membrane/γ-Fe2O3 nanoparticle passive sampler, Chemcatcher and polar organic chemical integrative sampler (POCIS) was evaluated. The majority of PRCs improved the semi quantitative nature of water concentration estimated by the three samplers. The corrected sampling rate values of model biotoxin compounds were used to estimate the time-weighted average concentrations in natural cyanobacterial water blooms of the Hartbeespoort dam. The corrected sampling rates R Scorr values vari...

Source: Physics and Chemistry of the Earth, Parts ABC - October 21, 2016 Category: Science Source Type: research