Doktorské studium

Studijní obor Chemie životního prostředí

Název práce: Zřízení sítě pro dlouhodobé globální monitorování organických polutantů ve vodním prostředí

Školitel: doc. Ing. Branislav Vrana, PhD.

Předběžné zadání:
Exposure assessment for contaminants in the aquatic environment most often relies on analytical measurements in a range of matrices and compartments that can include surface water, waste water, sediments and soils or measurements in biota. A clear understanding of their presence, of the processes that affect their movement and fate in the environment is a prerequisite to their risk assessment and therefore requires effective sampling and analytical strategies to obtain reliable information. While much effort has been put into the development and optimisation of instrumental methods for their analysis in the laboratory, many of the currently used sampling techniques, because of their cost are unsuitable for obtaining representative data. Therefore, there is a need for sampling techniques that are not only capable of detecting substances of interest, but also of quantifying their temporally averaged concentrations.
Passive sampling is a technique that allows to estimation of freely dissolved contaminant concentrations in the aquatic environment (water and sediments). The measurement of freely dissolved concentrations in water is important since these concentrations are directly related to the dose or exposure of biota to these chemicals. Passive sampling involves the deployment of devices in situ in water for periods of days to months and accumulation of analytes of interest during exposure. The accumulation by diffusion is driven by a gradient of concentration between the water and that in the sampler, initially free of the contaminant of interest. Ultra-low limits of detection can be obtained and this makes these devices suitable for monitoring remote aquatic environments where contaminant concentrations are likely to be very low.
The PhD candidate will collaborate on the establishment of a passive sampling network to enable the monitoring an assessment of chemical pressure that aquatic environments are under (through both long-range transport and local emissions) and to track spatial and temporal changes in contaminant levels on a global scale.
The objectives of the PhD study are:
1. Establishment of a network for monitoring of trace organic pollutants in aquatic environment on a global scale using passive sampling
2.Determine spatial and temporal trends in freely dissolved contaminant concentrations in both marine and freshwaters in selected areas worldwide, including remote areas such as Arctic
3. Screen and identify of novel known/unknown chemicals of emerging interest
4. Obtain data to further our understanding of long-range transport of persistent chemicals in the aquatic environment

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