Concept

Chromatographie en phase gazeuse-spectrométrie de masse

Publications associées (331)

Simultaneous determination of bromide, bromate and nitrite in low mu g 1(-1) levels by ion chromatography without sample pretreatment

A new ipn chromatographic method has been developed for the simultaneous analysis of the major matrix anions (chloride, nitrate, phosphate, sulfate, etc.), lower concentrated bromide, oxyhalides (iodate, chlorite, bromate) and nitrite in fresh waters and s ...

1999

Determination of iodide and iodate by ion chromatography with postcolumn reaction and UV/visible detection

Urs von Gunten

Iodide and iodate can be determined by two new methods using anion-exchange chromatography with postcolumn reaction and UV/visible detection. Iodide is determined as IBr2- at 249 mn. Iodate is determined as I-3(-) at 288 nm. The analyses can be run complet ...

1999

Vorrichtung zum Herstellen eines Gasgemisches

Patrik Willi Hoffmann

The invention relates to a device for producing a gas mixture consisting of HMDSO and oxygen, whereby process gas is produced. In order to be able to continuously produce a large volume of process gas using such a device and to be able to withdraw the same ...

1999

Gas spectrometry based on pyroelectric thin-film arrays integrated on silicon

Nava Setter, Paul Muralt

We report on a novel gas spectrometry technique using pyroelectric thin-him arrays. The 1 x 50 element arrays of PZT are integrated onto silicon using a membrane structure. The experimental characterization of the pyroelectric elements shows both high volt ...

1998

Silicon oxide particle formation in RF plasmas investigated by infrared absorption spectroscopy and mass spectrometry

Christoph Hollenstein, Alan Howling

In situ Fourier transform infrared absorption spectroscopy has been used to study the composition of particles formed and suspended in radio-frequency discharges of silane-oxygen-argon gas mixtures. The silane gas constumption was observed by infrared abso ...

1998

Ion physics and technologies for the trace element analysis

Yury Tsybin

A review, with 9 refs., is given on trace element anal. by mass spectrometry (MS) and potentiometric stripping anal. (PSA). The key question of the problem is detn. of the structure of the samples (i.e. distribution functions and concns. of atoms, mols., c ...

1998

Surface analysis of polyester materials using time of flight secondary ion mass spectrometry

The use of many plastic packaging materials such as PVC, PAN, etc. to protect food and beverages is restricted because of toxicity and recycling problems and there is a need for the development of new packaging materials with good gas barrier properties. P ...

EPFL1997

From molecules to particles in silane plasmas

Christoph Hollenstein, Alan Howling, Laurent Fabien Hubert Sansonnens

Particle formation has been investigated experimentally from the initial molecular precursors up to the final micron-sized particles in a low pressure silane rf capacitive discharge. Neutrals and ions were studied by quadrupole mass spectrometry in power-m ...

1996

Anionic clusters in dusty hydrocarbon and silane plasmas

Christoph Hollenstein, Alan Howling, Laurent Fabien Hubert Sansonnens

Measurements of anions and cations are reported for hydrocarbon and silane radio frequency capacitive glow discharges. Series of anions were observed by quadrupole mass spectrometry using power-modulated plasmas, and their structures are interpreted from t ...

1996

Modeling of surface intermediates under forced periodic conditions applied to CO2 methanation

Albert Renken

Forced oscillations of the carbon dioxide concn. in a hydrogen feed were applied to the carbon dioxide methanation reaction with simultaneous gas phase and surface anal. The response of the gas phase and surface species to these repeated dynamic conditions ...

1996

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