ASTM D4928

Standard Test Method for Water in Crude Oils by Coulometric Karl Fischer Titration

This test method covers the determination of water with true concentration range from 0.02 % to 5.00 % by mass or volume in crude oils. Mercaptan (RSH) and sulfide (S− or H2S) as sulfur are known to interfere with this test method, but at levels of less than 500 μg/g [ppm(m)], the interference from these compounds is insignificantECH

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