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Determination of N-methylpyrrolidone in lubricating oil samples by g.c.

โœ Scribed by S.D. Bhagat; D.S. Aswal; R.P. Badoni

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
489 KB
Volume
68
Category
Article
ISSN
0016-2361

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Determination of aromatic hydrocarbon fraction in oil shale by 13C n.m.r. with magic-angle spinning
โœ Henry A. Resing; Allen N. Garroway; Robert N. Hazlett ๐Ÿ“‚ Article ๐Ÿ“… 1978 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 593 KB

A method for estimation of aromatic content in oil shales is demonstrated. Magic-angle spinning at 2 kHz is shown to remove chemical shift anisotropy to a sufficient degree to resolve aromatic and aliphatic 13C n.m.r. spectral regions for a lithic oil shale specimen. The proton and carbon n.m.r. rel