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Why are percentage purities for assays by titration sometimes greater than 100 on the certificate of analysis?

April 26, 2017analysis assay Certificate greater PERCENTAGE purities titration

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Why are percentage purities for assays by titration sometimes greater than 100 on the certificate of analysis?

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Titration measures the ions present in reference to a standard. In some instances there may be other ions of similar valency present. If the titration is not able to differentiate between ionic species in solution then these ions may also contribute to the value determined. In some cases the additional contribution from this non-specificity takes values above the theoretical maximum amount determinable for the titrated species.