ESSO UNIVOLT 50 and 56, paraffinic uninhibited transformer oils were analysed. A coulometric determination was conducted because of the low water content. Since purely alcoholic reagents are not suitable for extracting water with multiple injections, we used reagents that contain solubilizers. While very few oil samples clearly dissolved, they did disperse. Using reagents that contain chloroform and/or xylene requires the use of a coulometric cell with diaphragm. We also followed the indirect method with a KF oven for vials.
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