摘要：

The pale yellow complex of ferrous ion and phenanthroline has been demonstrated to be ferrous monophenanthroline. The dissociation constant of this complex is about 1.3 × 10-6 at 25°. Conditions for the colorimetric determination of phenanthroline (as ferrous triphenanthroline) have been established. Error resulting from variations in acidity and iron concentration have been investigated experimentally and theoretically.

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