Browse Prior Art Database

Removal of Volatile Contaminants

IP.com Disclosure Number: IPCOM000088863D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fazzalari, FA: AUTHOR [+2]

Abstract

During analysis, volatile organic compounds usually contaminate the SIFAD* tube of the Plasma Chromotograph (PC) at the point of entry. These compounds cling to the walls of the tube for extended periods of time. As a result, peaks obtained on the PC thereafter are invalid due to this contamination. In order to obtain valid, uncontaminated analysis, a cleansing period, extending for several days, is required. Such cleansing is normally effected by purging the tube with nitrogen gas (N(2)).

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Removal of Volatile Contaminants

During analysis, volatile organic compounds usually contaminate the SIFAD* tube of the Plasma Chromotograph (PC) at the point of entry. These compounds cling to the walls of the tube for extended periods of time. As a result, peaks obtained on the PC thereafter are invalid due to this contamination. In order to obtain valid, uncontaminated analysis, a cleansing period, extending for several days, is required. Such cleansing is normally effected by purging the tube with nitrogen gas (N(2)).

It has been found that by substitution of helium gas (for nitrogen), the drift tube can be cleansed and discharged of all volatiles very rapidly, e.g., within a period of less than an hour. For example, a volatile organic, such as valeric acid, which would normally contaminate the drift area of the tube for at least 24 hours, during cleaning with nitrogen, can be purged and discharged in less than 60 minutes with the use of helium. After purging, the nitrogen can be switched back as a carrier gas for analysis, and the PC is ready to perform further analysis with resultant normal uncontaminated peaks. * Marketed by PCP Inc., West Palm Beach, Fla.

1