Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Lubricant testing
Patent
1983-01-24
1985-03-19
Levy, Stewart J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Lubricant testing
73 611C, G01N 3108
Patent
active
045051496
ABSTRACT:
A method and apparatus for determining the molecular weight of an unidentified liquid component of given molecular weight by flow through an open capillary tube in the range of N=about 0.1 to N=about 10.0 where N=number of theoretical plates in the tube length=(2 DL/F), where L=tube length, F=flow rate and D=the diffusion coefficient of the liquid component comprising passing the liquid component in plug flow within a mobile liquid phase at a preselected flow rate through an open discharge capillary tube of preselected diameter and length, obtaining a chromatogram of the eluted component over a time period of at least twice the break-through time period, measuring the vertical heights h.sub.1 and h.sub.2 of the chromatogram at times t.sub.1 equal to 1.2 times the break-through time and t.sub.2 equal to 2.0 times the break-through time, computing the ratio R of the heights h.sub.1 and h.sub.2, and obtaining the molecular weight of the liquid component by reference to a standard plot of the ratio R versus molecular weights for a multiplicity of different liquid component samples of known molecular weight tested under the same conditions in the same apparatus and mobile liquid phase as the sample and lying within the range of analytical interest.
REFERENCES:
patent: 3422667 (1969-01-01), Hrdina
patent: 3837217 (1974-09-01), Schulz
patent: 4258564 (1981-03-01), Hulme et al.
A. Ouano, Gel Permeation Chromatography VII, Molecular Weight Detection, 1973.
"Early Phases of the Dispersion of a Sample Injected in Poiseuille Flow", by Marcel J. E. Golay and John G. Atwood, Journal of Chromatography, 186, (1979), 353-370.
"Dispersion of Peaks by Short Straight Open Tubes in Liquid Chromatography Systems", by John G. Atwood and Marcel J. E. Golay, Journal of Chromatography, 218, (1981), 97-122.
Levy Stewart J.
University of Delaware
Williams Hezron
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