Column specific parameters for retention time locking in chromat

Details Column specific parameters for retention time locking in chromat Column specific parameters for retention time locking in chromat

1998-07-24

2000-03-14

Spitzer, Robert

Gas separation: processes

Chromatography

96102, B01D 1508

Patent

active

060367474

ABSTRACT:
The present invention provides an improved method for calculating and adjusting the column head pressure of a GC instrument based on the column's plate capacity, N.sub.c, and film thickness, d.sub.s, measured ideally during the manufacturing process and identified with the column such that software associated with the GC instrument can calculate a new column head pressure based on the relationship between the plate capacity and film thickness of the existing column to the plate capacity and film thickness of the new or shortened column. The column head pressure of the GC is adjusted to the new column head pressure to provide a reduction in the column-to-column non-reproducibility error in retention times of all peaks.

REFERENCES:
patent: 4824446 (1989-04-01), Mowery, Jr.
patent: 4927532 (1990-05-01), Pospisil et al.
patent: 4948389 (1990-08-01), Klein et al.
patent: 4994096 (1991-02-01), Klein et al.
patent: 5108466 (1992-04-01), Klein et al.
patent: 5281256 (1994-01-01), Sacks et al.
patent: 5405432 (1995-04-01), Snyder et al.
patent: 5436166 (1995-07-01), Ito et al.
patent: 5545252 (1996-08-01), Hinshaw et al.
patent: 5670379 (1997-09-01), Ito et al.
patent: 5738707 (1998-04-01), Colombo et al.
patent: 5892458 (1999-04-01), Anderer et al.
"Standard Test Method For Detailed Analysis Of Petroleum Naphthas Through n-Nonane By Capillary Gas Chromatography", ASTM Committee D-2 on Petroleum Products and Lubricants, Published Oct. 1992 (Originally published as D 5134-90.
Hewlett-Packard Co., Operation Manual, "5880A Gas Chromatograph PNA Analyzer, Option 850", Oct. 1982, Revised Jul. 1983; Part No. 18900-90850.
Hewlett-Packard Co., Operation Manual, "The HP 5880A Gas Chromatograph and the HP85 Computer Configured for PNA Analysis"; 18900-90603; Mar. 1985 Rev. B, Apr. 1986 Rev C.
Hewlett-Packard Instruction Manual, "GC-AED QuickScreen Methods", Sep. 20, 1994, 51 pages.
"HP 5898A Microbial Identification System" Operating Manual, Version 3.0 Part No. 19298-90100, Mar., 1984 (Rev. Oct. 1987).

Affiliated with

Also associated with

Rating

Column specific parameters for retention time locking in chromat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Column specific parameters for retention time locking in chromat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Column specific parameters for retention time locking in chromat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-164900