Polaire stoffen, zoals medicijnen of drugs, worden steeds vaker aangetroffen in het milieu. Het a... more Polaire stoffen, zoals medicijnen of drugs, worden steeds vaker aangetroffen in het milieu. Het aantal stoffen en hun concentraties zullen in de toekomst nog hoger worden door de vergrijzing. Drugs en medicijnen zijn moeilijk uit het water te zuiveren. Experimenten laten zien dat nieuwe materialen, zoals gefunctionaliseerde polymeren, mogelijkheden bieden voor de zuivering van water voor de drinkwaterbereiding.
Environmental Science: Processes & Impacts, 2020
The Independent-Mode model explains observed sorption phenomena of surfactants at low concentrati... more The Independent-Mode model explains observed sorption phenomena of surfactants at low concentrations (Cs→0,Cw→0) to complex sediments better than the Dual-Mode model.
Estuarine and coastal waters which chemical analysis of water was performed and also a toxicity a... more Estuarine and coastal waters which chemical analysis of water was performed and also a toxicity assessment using the Pulse Amplitude Modulation (PAM) fluorometry assay that measures ΦPSII. The toxic pressure on ΦPSII in microalgae has decreased with 55-82% from 2003 to 2012, with the Western Scheldt estuary showing the highest toxic pressure. By combining toxicity data from the PAM assay with chemical analysis of herbicide concentrations, we have identified diuron and terbutylazine as the main contributors to the toxic pressure on microalgae. Although direct effects are not expected, the toxic pressure is close to the 10% effect level in the PAM assay. A compliance check with the current environmental legislation of the European Union revealed that the quality standards are not sufficient to protect marine microalgae.
Environmental toxicology and chemistry / SETAC, Jan 27, 2016
To predict the fate and potential effects of organic contaminants, information about their hydrop... more To predict the fate and potential effects of organic contaminants, information about their hydrophobicity is required. However, common parameters to describe the hydrophobicity of organic compounds (e.g., octanol-water partition constant, Kow ) proved to be inadequate for ionic and nonionic surfactants due to their surface-active properties. As an alternative approach to determine their hydrophobicity, the aim of the present study was therefore to measure the retention of a wide range of surfactants on a C18 stationary phase. Capacity factors in pure water (k'0 ) increased linearly with increasing number of carbon atoms in the surfactant structure. Fragment contribution values were determined for each structural unit with multilinear regression and the results were consistent with the expected influence of these fragments on the hydrophobicity of surfactants. Capacity factors of reference compounds and log Kow values from literature were used to estimate log Kow values for surfa...
Polaire stoffen, zoals medicijnen of drugs, worden steeds vaker aangetroffen in het milieu. Het a... more Polaire stoffen, zoals medicijnen of drugs, worden steeds vaker aangetroffen in het milieu. Het aantal stoffen en hun concentraties zullen in de toekomst nog hoger worden door de vergrijzing. Drugs en medicijnen zijn moeilijk uit het water te zuiveren. Experimenten laten zien dat nieuwe materialen, zoals gefunctionaliseerde polymeren, mogelijkheden bieden voor de zuivering van water voor de drinkwaterbereiding.
Environmental Science: Processes & Impacts, 2020
The Independent-Mode model explains observed sorption phenomena of surfactants at low concentrati... more The Independent-Mode model explains observed sorption phenomena of surfactants at low concentrations (Cs→0,Cw→0) to complex sediments better than the Dual-Mode model.
Estuarine and coastal waters which chemical analysis of water was performed and also a toxicity a... more Estuarine and coastal waters which chemical analysis of water was performed and also a toxicity assessment using the Pulse Amplitude Modulation (PAM) fluorometry assay that measures ΦPSII. The toxic pressure on ΦPSII in microalgae has decreased with 55-82% from 2003 to 2012, with the Western Scheldt estuary showing the highest toxic pressure. By combining toxicity data from the PAM assay with chemical analysis of herbicide concentrations, we have identified diuron and terbutylazine as the main contributors to the toxic pressure on microalgae. Although direct effects are not expected, the toxic pressure is close to the 10% effect level in the PAM assay. A compliance check with the current environmental legislation of the European Union revealed that the quality standards are not sufficient to protect marine microalgae.
Environmental toxicology and chemistry / SETAC, Jan 27, 2016
To predict the fate and potential effects of organic contaminants, information about their hydrop... more To predict the fate and potential effects of organic contaminants, information about their hydrophobicity is required. However, common parameters to describe the hydrophobicity of organic compounds (e.g., octanol-water partition constant, Kow ) proved to be inadequate for ionic and nonionic surfactants due to their surface-active properties. As an alternative approach to determine their hydrophobicity, the aim of the present study was therefore to measure the retention of a wide range of surfactants on a C18 stationary phase. Capacity factors in pure water (k'0 ) increased linearly with increasing number of carbon atoms in the surfactant structure. Fragment contribution values were determined for each structural unit with multilinear regression and the results were consistent with the expected influence of these fragments on the hydrophobicity of surfactants. Capacity factors of reference compounds and log Kow values from literature were used to estimate log Kow values for surfa...
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