Publicaties
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Sulphur dynamics in forest ecosystems following the reduction of sulphur deposition Instituut voor Natuur- en Bosonderzoek
Organic and inorganic sulphur compounds releases from high-pyrite coal pyrolysis in H-2, N-2 and CO2: Test case Chinese LZ coal Universiteit Hasselt
The effects of different atmospheres on the distribution of organic and inorganic sulphur compounds during high-pyrite coal pyrolysis were investigated. Sulphur compound releases were determined by atmospheric pressure-temperature programmed reduction (AP-TPR) "on-line" coupled with MS and AP-TPR "off-line" coupled with TD-GC/MS, which is a reliable technique for coal sulphur characterization. The results show that the decomposition of both ...
Characterisation of volatile organic sulphur compounds release during coal pyrolysis in inert, hydrogen and CO2 atmosphere Universiteit Hasselt
The effects of CO2 atmosphere on the distribution of volatile organic sulphur compounds during coal pyrolysis and the effect of kaolin addition were studied. Sulphur compounds release was determined by atmospheric pressure-temperature programmed reduction "on-line" coupled with MS (AP-TPR/MS) and "off-line" coupled with GC/MS after thermal desorption (AP-TPR-TD-GC/MS). The results show that thiophene and methyl and ethyl substituted analogues ...
Organic sulphur alterations in biodesulphurized low rank coals Universiteit Hasselt
Two Bulgarian high sulphur coals, i.e. subbutiminious (Pirin) and lignite (Maritza East), and one Turkish lignite (Cayirhan-Beypazari) are biodesulphurized on laboratory scale. Prior to biotreatments coal samples are chemically treated to be demineralized and depyritized. Due to chemical treatments total sulphur desulphurization in the range of 25.3-54.2% is achieved. Inorganic sulphur (pyritic and sulphatic) is mainly attacked. Pyritic sulphur ...
Evaluation of elemental sulphur in biodesulphurized low rank coals Universiteit Hasselt
A new procedure for elemental sulphur (Sel) determination in coal and its fractions is offered. It includes exhaustive CHCl3 extraction and subsequent quantitative analysis of the extracts by HPLC using C18 reversed phase column. Its application gives ground to achieve better sulphur balance and to specify the changes in the organic and elemental sulphur as a result of biotreatments. Two Bulgarian high sulphur containing coal samples, i. e. ...
The Influence of Bioturbation on Iron and Sulphur Cycling in Marine Sediments: A Model Analysis Vrije Universiteit Brussel Universiteit Antwerpen
The geochemical cycles of iron and sulphur in marine sediments are strongly intertwined and give rise to a complex network of redox and precipitation reactions. Bioturbation refers to all modes of transport of particles and solutes induced by larger organisms, and in the present-day seafloor, bioturbation is one of the most important factors controlling the biogeochemical cycling of iron and sulphur. To better understand how bioturbation ...
Molecular and Cellular Aspects of Contaminant Toxicity in Plants: The Importance of Sulphur and Associated Signalling Pathways Universiteit Hasselt
Environmental contamination with metals and organic compounds poses a serious threat to human health. Investigating plant responses to these contaminants at the molecular and cellular level is crucial to optimize phytoremediation strategies to clean up contaminated soils. Two key players in plant stress responses are the sulphur-containing amino acids cysteine and methionine. Cysteine is an important constituent of the metal-chelating ...
Distribution of sulphur compounds in sewage sludge treatment KU Leuven Universiteit Antwerpen
Sewage sludge contains a significant concentration of sulphur (0.3-2.3 wt%) that hampers sludge (co-)combustion as the final disposal route due to the formation and emission of gaseous SO2 and associated acid rain problems. It is therefore of paramount importance to limit the sulphur content of waste-activated sludge (WAS) as much as possible. This paper studies the distribution and transformations of sulphur compounds occurring during the ...
Assessment of the potential for in-plume sulphur dioxide gas-ash interactions to influence the respiratory toxicity of volcanic ash Vrije Universiteit Brussel
Background: Volcanic plumes are complex environments composed of gases and ash particles, where chemical and physical processes occur at different temperature and compositional regimes. Commonly, soluble sulphate- and chloride-bearing salts are formed on ash as gases interact with ash surfaces. Exposure to respirable volcanic ash following an eruption is potentially a significant health concern. The impact of such gas-ash interactions on ash ...