为什么更换批次的认证值和不确定性与CRM的第一批发布批次不同？
替代批次通常由与CRM的第一批次不同的原材料生产。因此，它们不具有相同的性质值（分析物含量等）。尽管我们试图匹配第一批，但这有时是不可能的，甚至是不可取的：实验室中经常遇到的分析物含量的变化应该通过CRM浓度水平的变化来反映
Why do certified values and uncertainties of replacement batches differ from the first released batch of a CRM?
Replacement batches are usually produced from different raw materials than the first batch of a CRM. Therefore, they do not have the same property values (analyte content etc.). Although we try to match the first batch, this is sometimes impossible or even not desirable: changes in the analyte content routinely encountered in the laboratory should be reflected by changes in the concentration levels of the CRM.
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