Argon, as carrier gas

Small amounts of pyridine have been purified by vapour-phase chromatography, using a 180-cm column of polyethyleneglycol-4(X) (Shell 5%) on Embacel (May and Baker) at 100°, with argon as carrier gas. The Karl Fischer titration can be used for determining water content. A colour test for pyrrole as a contaminant is described by Biddiscombe et al. [J Ghent Soc 1957 1 954]. 

Gas chromatography of the benzene or toluene extracts was carried out on a borosilicate glass column (180cmx3mm o.d.) packed with 5% DC-200 and 7.5% QF-1 on Chromosorb W (80-100 mesh) operated at 190°C with nitrogen or argon as carrier gas and electron capture detection. Major peaks were obtained for S4, S6 and S8. Down to lpg L 1 of sulphur could be determined in the aromatic solvent extracts. 

Materials. The gases used had a purity >99% the carbon monoxide contained <1% hydrogen by GLC silica gel, 4 m X 1/8 inch, 70 °C, Perkin-Elmer F 11 hot wire gas chromatograph and argon as carrier gas. All hydroformylation experiments were performed with a 1 1 mixture of carbon monoxide and hydrogen. The olefinic substrates were Fluka AG pure or very pure grade. a-Ethylstyrene, prepared according to Ref. 21, was > 98% pure by GLC. 

The groups of Rhee and Jun synthesized La(thd)3(tetea) (24) and La(thd)3-(tetraglyme) (25), which show an increased solubihty compared to La(thd)3, for use as precursors in direct liquid injection MOCVD. Deposition on Si(lOO) between 325 and 450 °C using argon as carrier gas along with oxygen as reactive gas lead to smooth dense... 

A recent and promising modification of the transpiration method incorporates levitation heating of the specimen as problems associated with specimen + container reactions are thereby avoided. Thus Svyzahineto/. have combined levitation melting with transpiration measurements, using argon as carrier gas, in determinations of the vapour pressure of iron at temperatures around 2275 K, and Mills and Kinoshita have used... 

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