ABSTRACT
A method is described in which phenols extracted from the condensate of automobile exhaust gases are determined directly by GLC. The quantities of various phenols found are calculated by using tridecane as an internal standard. The emission of phenols from cars running on fuels containing different concentrations of aromatics, and on leaded and lead-free fuels, has also been considered. The results show that the concentration of total phenols is dependent on the type of sample, and is strongly dependent on the concentration of aromatic hydrocarbons and of tetraethyl-lead in the fuel.
ABSTRACT
Monosubstituted benzaldehyde isomers have been studied quantitatively on nine stationary liquid phases of various physical and chemical characteristics and at different operating temperatures. Apiezon 1 + Bentone 34, dinonyl phthalate and di(2-ethylhexyl)sebacate are found to be selective for quantitative separation of the isomers studied.
ABSTRACT
The factors influencing the separation of monosubstituted phenols on silicone oil, poly(ethylene glycol) (1500), Apiezon L + Bentone 34, squalane, Versamide and diethylhexyl sebacate are discussed. Specific retention volumes, height equivalent to a theoretical plate and thermodynamic quantities are reported. Diethylhexyl sebacate and Versamide are selective for quantitative separation of all the isomers studied.
ABSTRACT
The forces influencing the separation of n-, s-, and tbutylbenzenes on dinonyl phthalate, diethylhexyl sebacate, squalane, 1,2,3-tris(2-cyanoethoxyl)propane and Apiezon L modified with Bentone 34, are discussed. Specific and relative retentions, and thermodynamic quantities are calculated and reported. Diethylhexyl sebacate, Apiezon L modified with Bentone 34, and dinonyl phthalate are found to be selective for quantitative separation of butylbenzene isomers.
