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Most current monographs describe quantitative determinations: a content calculation is necessary for establishing compliance with the monograph.

In older monographsIn the past, the acceptance criteria for related substances were are expressed relative to the area of a reference peak of known concentration (limit test, area comparison). Without providing a numerical result, the comparison of peak areas leads to a pass/fail decision. For comparative tests, the The approximate content of impurity tolerated, or the sum of impurities, is indicated in brackets for information only. In most cases, the current monographs describe quantitative determinations: a calculation of the content is necessary to establish compliance with the monograph.