Application of automatic calculation of Kováts retention indices to evironmental analyses by gas chromatography —mass spectromety-—calculator

✍ Scribed by K.R. Betty; F.W. Karasek

• Book ID: 104143975
• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 836 KB
• Volume: 166
• Category: Article
• ISSN: 1873-3778
• DOI: 10.1016/s0021-9673(00)92254-4

✦ Synopsis

Automatic calculation and plots of Kov&s' retention indices (RI) from gas chromatographic (GC) analysis of environmental samples is provided by a calculatorcontrolled GC-mass spectrometric (MS) system. The retention indices framework of carbon numbers is set up using a standard sample containing all the desired n-hydrocarbons which are automatically identified in a GC-MS run by the presence of the m/e 85.1 C6H13t ion and the molecular ion. These standard retention data are used to automatically calculate RI values for samples extracted from airborne particulate matter run under identical GC conditions. n-Hydrocarbons

present in a sample can be employed as internal standards but an editing subroutine may be necessary to remove ambiguities.

Standard deviation of a test of the external standard method is 2.4 RI units, of the interna standard method 1.5 RI units.