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(a) These methods of test cover procedures for the determination of dissolved oxygen in industrial water. Three methods are given, as follows: Sections Referee Method 4 to 9, Non-Referee Method A 10 to 15, Non-Referee Method B 16 to 21, (b) The referee method covers the procedure for the most precise and accurate determination of dissolved oxygen in all industrial waters. Non-referee methods A and B cover procedures of greater simplicity and lesser precision and accuracy than the referee method.