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In this study, a rapid and sensitive method using capillary electrophoresis with indirect UV detection and minimal sample pretreatment was developed and evaluated to analyze choline chloride in oilfield process water samples. To improve peak resolution and separation of choline chloride from other cations present in the samples, the addition of a cationic visualization agent in the background electrolyte, imidazole, and a complexing agent, 18-crown-6, were introduced. Other factors affecting separation and sensitivity were also investigated. Under optimized conditions, choline chloride was baseline separated (1.5 between adjacent peaks. The limits of detection (signal-to-noise ratio = 3) and quantitation (signal-to-noise ratio = 10) were 14.7 and 48.9 mg [L.sup.-1] respectively. The peak area and migration time's intraday and interday precision (percent RSD) were all Key words: choline chloride, oilfield process water, capillary electrophoresis, liquid chromatography--mass spectrometry, Reinecke salt gravimetry. Dans cette etude, nous avons mis au point une methode rapide et sensible faisant appel a l'electrophorese capillaire a detection UV indirecte et comportant un pretraitement minimal des echantillons, et nous l'avons evaluee dans le cadre de l'analyse du chlorure de choline dans des echantillons d'eaux de traitement provenant de champs petroliferes. En vue d'ameliorer la resolution des pics et la separation du chlorure de choline des autres cations presents dans les echantillons, nous avons ajoute a l'electrolyte support un agent de visualisation cationique, l'imidazole, et un agent complexant, l'ether 18-couronne-6. Nous avons egalement etudie d'autres facteurs influant sur la separation et la sensibilite. Dans les conditions optimisees, le chlorure de choline a ete separe a la ligne de base (1,5 entre les pics adjacents. Les limites de detection (rapport signal/bruit = 3) et de quantification (rapport signal/bruit = 10) etaient respectivement de 14,7 et de 48,9 mg*[L.sup.-1]. Les valeurs de precision intrajournaliere et interjournaliere (coefficient de variation [CV] en %) de l'aire sous la courbe et du temps de migration etaient toutes Mots-cles: chlorure de choline, eaux de traitement des champs petroliferes, electrophorese capillaire, chromatographie liquide couplee a la spectrometrie de masse, methode gravimetrique au sel de Reinecke., Introduction Large-scale hydraulic fracturing of oil and gas bearing formations as a method of well stimulation has increased substantially in recent years, especially for tight reservoirs such as those containing [...]