Abstract
Double iodometric titration is the most useful method to determine oxygen content of high T c superconductors. Its traditional calculating formula is not accurate enough, and a new calculating formula has just been put forward. To understand which relationship of the traditional formula depends on the new one is an important problem. On studying the new formula, we find a modified function F relating the traditional formula to the new one, and also find that the value of F depends only on molar weight of the superconductor. For Y, Bi, and Hg systems, a group of curves of the modified function are put forward here. Since many results about average copper valence and oxygen content have been published, to correct those results one can modify them by means of the corresponding F. As a sample, we modify two published data of average copper valence and oxygen content of Y and Bi systems. After comparing the unmodified with the modified data, we find that it is necessary to modify the published data for quantitative research.
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