. "RIV/61388955:_____/05:00000805!RIV06-AV0-61388955" . "24" . . "P(GA202/03/0827), P(GA203/02/0737), Z(AV0Z40400503)" . "Hmotnostn\u00ED spektrometrie v proudov\u00E9 trubici s vybran\u00FDmi ionty (SIFT-MS) pro pr\u016Fb\u011B\u017Enou anal\u00FDzu stopov\u00FDch plyn\u016F"@cs . "1"^^ . . . . . . "0277-7037" . . "Smith, D." . "661;700" . . . "Selected ion flow tube mass spectrometry (sift-MS) for on-line trace gas analysis" . . "\u0160pan\u011Bl, Patrik" . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "RIV/61388955:_____/05:00000805" . . "Selected ion flow tube mass spectrometry (SIFT-MS) is a new analytical technique for the real-time quantification of several trace gases simultaneously in air and breath. It relies on chemical ionization of the trace gas molecules in air/breath samples introduced into helium carrier gas using H3O+, NO+, and O2+ precursor ions. Reactions between the precursor ions and trace gas molecules proceed for an accurately defined time, the precursor and product ions being detected and counted by a downstream mass spectrometer, thus effecting quantification. Absolute concentrations of trace gases in single breath exhalation can be determined by SIFT-MS down to ppb levels, obviating sample collection and calibration. Flowing afterglow mass spectrometry (FA-MS) is briefly described, which allows on-line quantification of deuterium in breath water vapor." . . . . "40"^^ . "Selected ion flow tube mass spectrometry (sift-MS) for on-line trace gas analysis" . "SIFT-MS; chemical ionization; trace gas analysis; breath analysis; urine headspace analysis"@en . "Selected ion flow tube mass spectrometry (SIFT-MS) is a new analytical technique for the real-time quantification of several trace gases simultaneously in air and breath. It relies on chemical ionization of the trace gas molecules in air/breath samples introduced into helium carrier gas using H3O+, NO+, and O2+ precursor ions. Reactions between the precursor ions and trace gas molecules proceed for an accurately defined time, the precursor and product ions being detected and counted by a downstream mass spectrometer, thus effecting quantification. Absolute concentrations of trace gases in single breath exhalation can be determined by SIFT-MS down to ppb levels, obviating sample collection and calibration. Flowing afterglow mass spectrometry (FA-MS) is briefly described, which allows on-line quantification of deuterium in breath water vapor."@en . . "Selected ion flow tube mass spectrometry (sift-MS) for on-line trace gas analysis"@en . . "542148" . "Hmotnostn\u00ED spektrometrie v proudov\u00E9 trubici s vybran\u00FDmi ionty (SIFT-MS) pro pr\u016Fb\u011B\u017Enou anal\u00FDzu stopov\u00FDch plyn\u016F"@cs . "5" . "Selected ion flow tube mass spectrometry (sift-MS) for on-line trace gas analysis"@en . "Mass Spectrometry Reviews" . . . "2"^^ . . "[4729C92E2312]" . "Hmotnostn\u00ED spektrometrie v proudov\u00E9 trubici s vybran\u00FDmi ionty (SIFT-MS) je nov\u00E1 analytick\u00E1 technika pro m\u011B\u0159en\u00ED koncentrac\u00ED n\u011Bkolika stopov\u00FDch plyn\u016F ve vzduchu a dechu sou\u010Dasn\u011B. Je zalo\u017Eena na chemick\u00E9 ionizaci molekul stopov\u00FDch plyn\u016F ve vzorc\u00EDch p\u0159iveden\u00FDch do nosn\u00E9ho plynu helia pomoc\u00ED prekurzorov\u00FDch iont\u016F H3O+, NO+ a O2+. Reakce mezi t\u011Bmito ionty a molekulami stopov\u00FDch plyn\u016F prob\u00EDhaj\u00ED b\u011Bhem p\u0159esn\u011B definovan\u00E9ho \u010Dasu. Ionty jsou detekov\u00E1ny a po\u010D\u00EDt\u00E1ny kvadrup\u00F3lov\u00FDm hmotnostn\u00EDm spektrometrem co\u017E umo\u017E\u0148uje v\u00FDpo\u010Det koncentrace l\u00E1tek. Absolutn\u00ED koncentrace stopov\u00FDch plyn\u016F v jedin\u00E9m v\u00FDdechu m\u016F\u017Ee b\u00FDt ur\u010Dena pomoc\u00ED SIFT-MS s citlivost\u00ED jedn\u00E9 \u010D\u00E1stice v miliard\u011B, a tak nen\u00ED t\u0159eba pou\u017E\u00EDvat sb\u011Br vzork\u016F do n\u00E1dob ani pr\u016Fb\u011B\u017Enou kalibraci. Hmotnostn\u00ED spektrometrie v proud\u00EDc\u00EDm dohas\u00EDnaj\u00EDc\u00EDm plazmatu (FA-MS) pro ur\u010Dov\u00E1n\u00ED zastoupen\u00ED deuteria ve vodn\u00ED p\u00E1\u0159e v dechu je tak\u00E9 stru\u010Dn\u011B pops\u00E1na."@cs .