Gas-liquid chromatographic fractionation of polyoxyethylene non-ionic surfactants
1978; Elsevier BV; Volume: 150; Issue: 2 Linguagem: Inglês
10.1016/s0021-9673(00)88204-7
ISSN1873-3778
Autores Tópico(s)Analytical chemistry methods development
ResumoThe gas-liquid chromatographic fractionation of the commercial biodegradable surfactants RO(CH2CH2O)nH (where R is an n-alkyl group and n is the number-average degree of polymerization) can be approached only for n ⩽ 4, as the truncation of the molecular-weight distribution occurs at higher n values. Although conversion into trimethylsily (TMS) derivatives improves the volatility of the oligomers, there is only a slight advantage in using this conversion procedure: TMS derivatives have the same elution temperature as untreated compounds above ca. 330°. The use of an internal standard as a reference compound for comparison of peak areas is a useful procedure, which has been tentatively applied to the reconstruction of the distribution of the surfactant with R = n-dodecyl and n = 7.1. The choice of the internal standard is discussed.
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