"Notched Broad-band Excitation Of Ions In A Bench-top Ion-trap Mass Spectrometer"
Anal. Chim. Acta 1995 Volume 303, Issue 2-3 Pages 149-162

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"Performance Of An Ion Trap Mass Spectrometer Modified To Accept A Direct Insertion Membrane Probe In Analysis Of Low Level Pollutants In Water"
Talanta 1993 Volume 40, Issue 7 Pages 1031-1039

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"Online Flow Injection Analysis Of Volatile Organic Compounds In Seawater By Membrane Introduction Mass Spectrometry"
Talanta 1995 Volume 42, Issue 9 Pages 1325-1334

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"Bioreactor Monitoring Using Flow Injection - Membrane-introduction Mass Spectrometry With An Ion-trap Detector"
Process Control Qual. 1991 Volume 1, Issue 2 Pages 105-116

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"Jet Separator Membrane Introduction Mass Spectrometry For Online Quantitation Of Volatile Organic Compounds In Aqueous Solutions"
Rapid Commun. Mass Spectrom. 1993 Volume 7, Issue 10 Pages 935-942

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			'title' => 'Notched broad-band excitation of ions in a bench-top ion-trap mass spectrometer',
			'journal' => 'Anal. Chim. Acta',
			'journal_id' => '0584',
			'fadid' => 'ANCA1995V0303P00149',
			'year' => '1995',
			'volume' => '303',
			'issue' => '2-3',
			'startpage' => '149',
			'endpage' => '162',
			'type' => 'Journal Article',
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			'abstract' => 'Selected ion-monitoring, tandem MS and mass-selective ion-molecule collisional applications of the title technique were demonstrated over the mass range 0-650 Da, with a 600 kHz pulse width and a He reverse-flow (2 ml/min) dual membrane sample introduction system with 70 eV EI. A variety of model volatile organic molecules in aqueous and aqueous 1% methanol were introduced using a flow injection system as described by Bauer and Cooks (Am. Lab., Oct 1993) and detected to parts per quadrillion levels.',
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			'citation' => ''Notched broad-band excitation of ions in a bench-top ion-trap mass spectrometer', Anal. Chim. Acta, 1995 303(2-3) 149-162',
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			'authors' => 'Bauer, S.J.;Cooks, R.G.',
			'authorsweb' => 'Scott J. Bauer and R. Graham Cooks',
			'title' => 'Performance of an ion trap mass spectrometer modified to accept a direct insertion membrane probe in analysis of low level pollutants in water',
			'journal' => 'Talanta',
			'journal_id' => '0569',
			'fadid' => 'TALT1993V0040P01031',
			'year' => '1993',
			'volume' => '40',
			'issue' => '7',
			'startpage' => '1031',
			'endpage' => '1039',
			'type' => 'Journal Article',
			'analytes' => ';0379;0381;0936;',
			'matrices' => ';1079;',
			'techniques' => ';0353;',
			'keywords' => ';0253;0216;0344;0415;0444;',
			'abstract' => 'Modifications to a Finnigan ITS40 ion trap mass spectrometer are described which allow its use with a direct insertion probe. Details are given of the fabrication of a membrane probe for such an instrument. The membrane probe, which includes facilities for heating the fluid, employs a tubular membrane which is located just outside the electrode structure of the ion trap. Direct analysis of organic compounds in aqueous solution is demonstrated using a silicone membrane, with compounds such as benzene, chlorobenzene and dichloroethene being studied below the 1 ppb level. The effects of operating parameters including probe temperature, ion trap temperature, solution flow rate, mass spectrometer scan speed, and instrument tune procedures are explored in detail. Optimum performance characteristics are identified and trace level detection of eight organic compounds in the parts per trillion range is demonstrated. In seven of the eight cases studied, detection limits are below the EPA practical limit of quantitation levels. It is shown that the most sensitive mode of operation is when steady state passage of the analyte across the membrane is achieved, however, the time required for this is long in the case of some samples, and a dynamic flow injection analysis procedure is then favored. Use of the modified inlet system for solid sample introduction via a standard solids probe is also demonstrated. [References: 19]',
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			'authors' => 'Kasthurikrishnan, N.;Cooks, R.G.',
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			'title' => 'Online flow injection analysis of volatile organic compounds in seawater by membrane introduction mass spectrometry',
			'journal' => 'Talanta',
			'journal_id' => '0569',
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			'keywords' => ';0462;0344;',
			'abstract' => 'FIA with membrane introduction MS for the determination of volatile organic compounds (VOC) in seawater was examined and was compared to measurements made in water. MS was performed using a benchtop ion-trap mass spectrometer and characterization of various aspects of the flow injection and ion-trap combination was carried out. The analyte responses were linear over several orders of magnitude (e.g. for methylene chloride), independent of seawater pH (e.g. for chlorobenzene) and independent of matrix effects for the VOC studied. A comparison of the performance of a microporous (Teflon) membrane was made, and the former provided lower detection limits which were in the parts-per-trillion range. The microporous membrane provided faster response times by a factor of four to five for relatively more polar compounds.',
			'language' => 'English',
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			'citation' => ''Online flow injection analysis of volatile organic compounds in seawater by membrane introduction mass spectrometry', Talanta, 1995 42(9) 1325-1334',
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			'authors' => 'Hayward, M.J.;Riederer, D.E.;Kotiaho, T.;Cooks, R.G.;Austin, G.D.;Syu, M.J.;Tsao, G.T.',
			'authorsweb' => 'M.J. Hayward, D.E. Riederer, T. Kotiaho, R.G. Cooks, G.D. Austin, M.-J. Syu and G.T. Tsao',
			'title' => 'Bioreactor monitoring using flow injection - membrane-introduction mass spectrometry with an ion-trap detector',
			'journal' => 'Process Control Qual.',
			'journal_id' => '0987',
			'fadid' => 'PCQU1991V0001P00105',
			'year' => '1991',
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			'issue' => '2',
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			'endpage' => '116',
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			'keywords' => ';0253;',
			'abstract' => 'Plugs (250 &micro;L) of the fermentation broth were injected into a stream (1 mL min-1) of water, followed after 2 min by a plug of standard solution The flow injection system delivered the sample and standard to a special membrane probe (described with diagram) to introduce analytes into an ion-trap mass spectrometer. The major liquid phase products (e.g., butane-2,3-diol, acetoin, acetic acid and ethanol) were monitored by scanning from m/e 45 to 95 by water CI at 20 &micro;Torr. The monitoring sequence was consecutive plugs of fermentation broth, standard, broth acidified with 0.1 M HCl (1:1) and acidified standard and monitoring at m/e 47, 61, 73 and 89. Acidification was required for acetic acid to permeate the membrane.',
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			'citation' => ''Bioreactor monitoring using flow injection - membrane-introduction mass spectrometry with an ion-trap detector', Process Control Qual., 1991 1(2) 105-116',
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			'authors' => 'Dejarme, L.E.;Bauer, S.J.;Cooks, R.G.;Lauritsen, F.R.;Kotiaho, T.;Graf, T.',
			'authorsweb' => 'L. E. Dejarme, S. J. Bauer, R. G. Cooks, F. R. Lauritsen, T. Kotiaho, T. Graf',
			'title' => 'Jet separator membrane introduction mass spectrometry for online quantitation of volatile organic compounds in aqueous solutions',
			'journal' => 'Rapid Commun. Mass Spectrom.',
			'journal_id' => '0783',
			'fadid' => 'RCMS1993V0007P00935',
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			'issue' => '10',
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			'endpage' => '942',
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			'abstract' => 'A new technique is described for the direct detection of volatile organic compounds present in aqueous solutions at levels in the parts per trillion range. The sample is enriched in analyte in two consecutive stages; one utilizes a semi-permeable membrane interface and the other a jet separator. The analyte solution is sampled as it flows coaxially over a semi-permeable capillary membrane, the interior of which is continuously purged by helium. The permeate is pneumatically transported to the mass spectrometer via a jet separator, which is used to remove excess helium and water from the analyte vapor stream. Data are reported for two instruments; in one the membrane/jet separator system is interfaced to a single quadrupole mass spectrometer via a custom-built metal jet separator with a variable capillary gap. In the second, an ion-trap mass spectrometer is used in conjunction with a conventional fixed-gap quartz jet separator. Typical analyte response times are 2-5 min at ambient temperature, and flow injection methods are used for sample delivery. Direct comparisons, made under identical instrumental conditions, show that the jet separator system displays even lower detection limits than a conventional direct-insertion membrane probe. Detection limits in the range 30 parts per trillion to a few parts per billion are observed for selected volatile organic compounds and the response is linear over 3 orders of magnitude. [References: 31]',
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include - APP/View/Elements/citation.ctp, line 40
View::_evaluate() - CORE/Cake/View/View.php, line 971
View::_render() - CORE/Cake/View/View.php, line 933
View::_renderElement() - CORE/Cake/View/View.php, line 1224
View::element() - CORE/Cake/View/View.php, line 418
include - APP/View/Techniques/view.ctp, line 52
View::_evaluate() - CORE/Cake/View/View.php, line 971
View::_render() - CORE/Cake/View/View.php, line 933
View::render() - CORE/Cake/View/View.php, line 473
Controller::render() - CORE/Cake/Controller/Controller.php, line 968
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167
[main] - APP/webroot/index.php, line 109