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发表于 2018-3-11 15:45:47
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Replicate injections of a standard preparation or other standard solutions are compared to ascertain whether requirements for precision are met. Unless otherwise specified in the individual monograph, data from five replicate injections of the analyte are used to calculate the relative standard deviation, %RSD, if the requirement is 2.0% or less;
data from six replicate injections are used if the relative standard deviation requirement is more than 2.0%.
标准制备液或标准溶液的重复进样是为了进行比较,以确定是否满足精度要求。除非在各论中另有规定,一般如果相对标准偏差要求≤2.0%,则应对分析物重复进样5次来计算相对标准偏差;如果相对标准偏差要求>2.0%,则应对分析物重复进样6次来计算相对标准偏差。
这个是之前在USP36中专论621-色谱法中系统适用性中提到的。我们公司对照品一般进样4针,不平则继续进。
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