Publications by authors named "B Seemann"
We report the observation of a new physical phenomenon of the addition of 2 hydrogen atoms to molecular ions thus forming [M + 2H] ions. We demonstrate such second hydrogen atom abstraction onto the molecular ions of pentaerythritol and trinitrotoluene (TNT). We used both gas chromatography mass spectrometry (GC-MS) with supersonic molecular beam (SMB) with methanol added into its make-up gas and electron ionization (EI) liquid chromatography mass spectrometry (LC-MS) with SMB with methanol as the LC solvent.
View Article and Find Full Text PDFA new type of electron ionization LC-MS with supersonic molecular beams (EI-LC-MS with SMB) is described. This system and its operational methods are based on pneumatic spray formation of the LC liquid flow in a heated spray vaporization chamber, full sample thermal vaporization and subsequent electron ionization of vibrationally cold molecules in supersonic molecular beams. The vaporized sample compounds are transferred into a supersonic nozzle via a flow restrictor capillary.
View Article and Find Full Text PDFAdvanced biodegradable and non-toxic organic chelators, which are soluble in organic media, were synthesized on the basis of the S,S-ethylenediamine-disuccinate (S,S-EDDS) ligand. The modifications suggested in this work include attachment of a lipophilic hydrocarbon chain ("tail") to one or both nitrogen atoms of the S,S-EDDS. The new ligands were designed and evaluated for application in the Sediments Remediation Phase Transition Extraction (SR-PTE) process.
View Article and Find Full Text PDFArticle Synopsis
- Sustainable biomass production is gaining importance as a key resource for future energy needs and renewable materials, with algal beds being a promising source for biofuels and CO2 storage.
- The efficiency of algae photosynthesis relies on matching solar light with chlorophyll absorption, and spectral conversion can enhance this process.
- Using a specific phosphor (Ca0.59Sr0.40Eu0.01S) to convert green light to red light increases the growth and oxygen production rates of algae in a closed-cycle reactor with the species Haematococcus pluvialis.
Background: Workers on dredgers and lighters on rivers are potentially exposed to a variety of substances.
Aims: To determine the internal load of heavy metals and arsenic as well as levels of cytogenetic markers in workers exposed to river silt aerosols.
Methods: One hundred exposed workers were examined up to eight times within three years.