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第29楼2008/09/05
imokfe 发表:我也对Spike solution是什么意思很迷惑，下面是USP方法的原文，希望对大家对这个词汇的意思能有所启发。
D. Sample Fortification and Mixed Standard Preparation
A Mixed Standard Spiking solution is prepared by mixing equal portions of the two stock standard solutions to create a solution which is 5.0 mg/mL in each analyte.
Spike Preparation
Weigh a 1.0 g portion of sample into a 15-mL centrifuge tube. A previously analyzed, representative example of the product which was found to be uncontaminated with the targets may be used.
Alternatively, select one of the samples which is about to be analyzed and spike a portion of it. This would have to be repeated with a different sample if it turns out that analysis of this sample without fortification gave evidence of contamination.
Add 200 μL of the Mixed Standard Spiking solution directly to the representative uncontaminated sample and proceed with the method. The spike must be observed to provide a basis for declaring that samples which provide signals below a certain threshold contain less than 1.0 mg/g of either target.
