Quantitative gas chromatographic analysis of metals, alloys, and metal oxides, carbides, sulfides, and salts

Support-deactivating fluorocarbon stationary phase for gas chromatography

“…The coating characteristics of fluorocarbon phases can change with temperature Figure 8. Separation of substituted benzene derivatives: (1) benzene, (2) toluene, (3) chlorobenzene, (4) m-and p-xylene, (5) o-xylene, (6) bromobenzene, (7) p-dichlorobenzene, (8) iodobenzene, (9) benzaldehyde, (10) benzyl alcohol, (11) nitrobenzene. Column is the same as described in Figure 5, temperature programmed 48 to 165 °C at 8 °C min"1, nitrogen carrier gas flow rate 30 mL min"1.…”

“…Early reports dealt with the use of perfluoroalkanes, Kel-F oils, and fluoroalkyl esters for the analysis of corrosive and reactive chemicals (e.g., UFe, C102F, SFsC1, etc. ), which could not be separated on conventional phases (1)(2)(3)(4)(5)(6). Attempts to use these phases for more general applications were less successful due to a combination of poor coating characteristics, low column efficiencies, and low upper operating temperature limits.…”

Polyperfluoroalkyl ether stationary phase for gas chromatography

“…The period 1960-1968 witnessed several attempts to exploit fluorocarbons such as perfluoroalkanes, Kel-F oils, fluoroalkyl esters, etc. as general phases in gas chromatography (1,(10)(11)(12)(13)(14). Column efficiencies were generally poor for organic compounds, typical values ranging from 30 to 225 theoretical plates/m.…”

Solvent extraction of sulfur from marine sediment and its determination by gas chromatography

“…The conversion of sulfur to sulfide using metallic copper is also widely used (ASTM, 1971). Juvet and Fisher (1966) converted sulfur to volatile sulfur hexafluoride in a special injector system. Kaplan et al (1963) analyzed the sulfur content in the sediment of Southern California Coastal Waters using a mixture of benzene, methanol, and acetone as extraction solvent, with extensive subsequent treatment and purifi-cation.…”