Determination of polyoxyethylene in small amounts of non-ionic detergents by hydrogen bromide fission followed by gas chromatography

Kaduji, I. I.; Stead, J. B.

doi:10.1039/an9760100728

Cited by 12 publications

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“…One approach to more specific determination of alcohol ethoxylates (AE) in environmental samples is the HBr cleavage-gas chromatography (GC) (3,4) procedure. The alkyl bromide cleavage products are determined by GC.…”

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Analysis of nonionic surfactants in bench‐scale biotreater samples

Dubey

Kravetz

Salanitro

1995

J Americ Oil Chem Soc

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The effluents and activated sludges used in benchscale biotreater units have been analyzed for nonionic alcohol ethoxylates and their residues. Separate bench-scale units were fed linear alcohol ethoxylates (AE), highly branched and branched nonylphenol ethoxylates. Effluents and sludges were first pretreated by a foam sublation technique to provide a gross separation of surfactants from the environmental matrix. This step was followed by normal-phase high-performance liquid chromatography (HPLC) with either fluorescence detection (FD) or evaporative light-scattering detection (ESLD). The AEs were derivatized with phenylisocyanate and analyzed by normal-phase HPLC coupled with FD. At extremely low surfactant levels, pretreatment of large sample volumes resulted in interferences on derivatization. Hence, a normal-phase HPLC method with ELSD was developed. Although some interferences do appear using ELSD, this method appears to be a more viable alternative to derivatization/FD for very low levels ofAE. HPLC with FD and ELSD detection methods are more quantitative and provide information on the polyoxyethylene chain than is possible with traditional methods like cobalt-thiocyanate active substance. 72, 23 30 (1995). JAOCSKEY WORDS: Activated sludge, bench-scale biotreater, environmental analysis, evaporative light-scattering detection, fluorescence detection, HPLC, nonionic surfactants. EXPERIMENTAL PROCEDURESApparatus. Two research quality HPLC instruments were used. A Varian Vista 5500 (Palo Alto, CA), with a single piston reciprocating pump, was used with the FD. A Varian Star

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