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The decreasing molar flame ionization detector response with the increasing length of the polyethylene oxide chain of three series of alkyl- and aryl-polyoxyethylene-trimethylsilyl ethers and a series of bis-trimethylsilylpolyoxyethylene ethers is described in terms of the effective carbon number (ECN) of each oligomer. When the ECN contribution of the -CH 2 -O-Si(CH 3 ) 3  group is assumed to be equivalent to 3.69 carbon atoms, the presence of each oxygen atom in the ethylene oxide chain is found to be equivalent to -0.41 ± 0.05 carbon atoms.

journal of chromatographic science

Estimation of Flame-Ionization Detector Relative Response Factors for Oligomers of Alkyl and Aryl Ether Polyethoxylates using the Effective Carbon Number Concept