A high performance liquid chromatography (HPLC) method using adsorption columns combined with linear gradient elution has been developed for the determination of ethylene oxide (EO) distribution in nonionic surfactants. The quantitative ethoxylate adduct distribution in single-carbon-number and mixed-carbon-number primary alcohol-based samples can be obtained. The HPLC method is also applicable for determining the molar EO distributions in diverse ethylene oxide adduct compounds such as alkylphenol ethoxylates, branched alcohol ethoxylates and secondary alcohol ethoxylates. Nonionic surfactant samples containing adducts up to 25 mol have been successfully separated and the individual adducts quantitated.

Ethylene oxide oligomer distribution in nonionic surfactants via high performance liquid chromatography (HPLC)

High-performance liquid chromatography and detection of polyethers and their mono(carboxy)alkyl and -arylalkyl substituted derivatives

Determination of poly(oxyethylene) alkylphenyl ether nonionic surfactants in water at trace levels by reversed phase adsorption liquid chromatography and field desorption mass spectrometry

Thin-Layer chromatography of polymes

Application of bonded diol phases for separation of ethoxylated surfactants by high-performance liquid chromatography☆

Rapid determination of the molecular-weight distribution of ethylene glycol oligomers by thin-layer chromatography and their photometric evaluation☆

Analysis of polyoxyethylene non-ionic surfactants by coupling gas-liquid and thin-layer chromatography

Fractionation of polyethylene glycol by thin-layer chromatography Studies on the choice of derivatives and eluent systems

Determination of the molecular-weight distribution of polyethylene glycols by thin-layer chromatography coupled with densitometry

A rapid method is described for the polarographic determination of chlorine, bromine and iodine in algae after a single combustion procedure. For the determination of chlorine and iodine, the anodic waves of their ions were recorded. For bromine, on the other hand, the bromide ions were oxidised quantitatively to bromate ions, and the cathodic wave for these was recorded. The method has been tested on several species of algae from the Gulf of Trieste.

Rapid polarographic determination of chlorine, bromine and iodine in algae

L. Favretto Gabrielli

Papers

Rapid determination of the molecular-weight distribution of ethylene glycol oligomers by thin-layer chromatography and their photometric evaluation☆

Analysis of polyoxyethylene non-ionic surfactants by coupling gas-liquid and thin-layer chromatography

Fractionation of polyethylene glycol by thin-layer chromatography Studies on the choice of derivatives and eluent systems

Determination of the molecular-weight distribution of polyethylene glycols by thin-layer chromatography coupled with densitometry

Rapid polarographic determination of chlorine, bromine and iodine in algae