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[求助]
雜質(zhì)峰 已有1人參與
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HPLC色譜圖上峰面積是4的小峰要不要當成雜峰看?可以不把它當成峰嗎? 發(fā)自小木蟲IOS客戶端 |
木蟲 (正式寫手)
| 在USP<621>中對最后一段中對雜質(zhì)的取舍進行了規(guī)定,原文如下:When 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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