Rationale behind ASTM D664 Method for TAN?

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I am an experienced chemist, but relatively new to work on oils. Can anyone explain the rationale why this method uses aqueous pH standards of 4 and 11 to mark the start and end points of the titration. Why is it not the same number of pH points either side of 7, i.e. 4 and 10? Is this entirely empirical?

Thanks in anticipation.

1/28/119:30 AM

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refrigguyMember

This may prove useful:

http://www.machinerylubricatio...052/acid-number-test

2/7/118:06 PM

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mikewayneMember

The pH values of the buffer solutions are arbitrary.

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2/14/119:36 PM

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