On-line, in situ analysis with membrane introduction MS

Article Abstract:

The high demand for techniques which provide accurate results in less time and lower costs has increased the usage of membrane introduction mass spectrometry (MMIS) in environmental testing. MMIS was designed to measure photosynthetic reaction kinetics in aqueous medium by allowing the diffusion of dissolved gases in the solution across a semipermeable membrane. At present, MMIS is used for on-line, in-situ analysis of volatile and semi-volatile organic compounds. However, instead of ordinary membranes, silicones are used for faster response times and more accurate results.

Mass Spectrometers & Spectroscopy, Innovations, Mass spectrometry

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Emissions of volatile organic chemicals from municipal solid waste composting facilities

Article Abstract:

The effects of odorous volatile organic chemical (VOC) emissions on the health of employees working in solid waste composting facilities were investigated using portable sampling tubes and thermal desorption gas chromatography/mass spectrometry. The measured data were further evaluated by means of the principal component analysis technique. Results show that the concentration of VOCs in composting facilities is way below workplace permissible exposure limits.

Health aspects, Environmental aspects, Compost plants, Indoor air quality

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ECD-dual column pesticide method verification by ion trap GC/MS and GC/MS/MS

Article Abstract:

Evaluation of the use of gas chromatographic separation with ion trap mass spectroscopy (GC/MS) in both electron impact (GC/EIMS) and tandem modes (GC/MS/MS) reveals that GC/EIMS has the lowest number of false positives and false negatives at 6 and 10 respectively. False positives and negatives for GC/MS/MS and Superfund Contract Laboratory Program data were 27 to 1 and 25 to 9 respectively.

Research and Development in the Physical, Engineering, and Life Sciences, Air Pollution Control R&D, Analytical instruments, Gas Chromatographs, Evaluation, Environmental monitoring, Air pollution research, Pollution control research, Gas chromatography

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