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| ÔÚUSP<621>ÖжÔ×îºóÒ»¶ÎÖжÔÔÓÖʵÄÈ¡Éá½øÐÐÁ˹涨£¬ÔÎÄÈçÏ£ºWhen the impurity test prescribes the total of impurities or there is a quantitative determination of an impurity, choice of an appropriate threshold setting and appropriate conditions for the integration of the peak areas is important. In such tests the limit at or below which a peak is disregarded is generally 0.05%. Thus, the threshold setting of the data collection system corresponds to at least half of this limit. Integrate the peak area of any impurity that is not completely separated from the principal peak, preferably by valley-to-valley extrapolation (tangential skim). |

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