API Chapter 10.9 5th Edition

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

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API Chapter 10.9 5th Edition
This test method covers the determination of water with true concentration range from 0.07 % to 9.5 % by mass and 0.02 % to 5.00 % by volume in crude oils using Procedures A and B, respectively, and from 0.04 % to 3.75 % by mass or volume for Procedure C. Mercaptan (RSH) and sulfide (Sβˆ’ or H2S) as sulfur are known to interfere with this test method, but at levels of less than 500 Β΅g ⁄g [ppm(m)], the interference from these compounds is insignificant.
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