Water determination in insulating oil by Honeywell
HYDRANAL™ Laboratory Report L 462
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 coulometry cell with diaphragm. We found 35 ppm of water with direct injection. We also followed the indirect method with a KF oven for vials. The analyses showed that 80°C was enough to release the water. We chose to precisely weigh in 4 mL oil sample and we found 26 ppm of water.
In this procedure, the carrier gas is fed directly into the sample. We noted that some 25% of the sample had transferred to the coulometry cell by the end of the determination, because the sample was frothing. The sample was reduced to around 2 mL so that the carrier gas no longer passed through the sample. This suppressed the frothing. As compensation, we set the minimum determination time to 900 seconds. We found 24 ppm of water.
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