我如何知道认证值是否对我的方法有效？
有两个CRM属性描述了材料对某种方法的有用性，即可追溯性和可交换性。可追溯性描述了认证值实际指的是什么，包括被测量的定义：它是关于总元素含量还是可提取元素含量，凯氏定氮还是杜曼斯N？可交换性描述了一种材料在给定方法下是否表现得与某个常规样品相似。因此，应该检查CRM的认证值是否可以追溯到与自己的方法相同的参考。如果不是这样，则说明材料不合适。示例：可追溯到某一ISO方法的膳食纤维认证值只有在使用该方法的情况下才有效。此外，应检查是否确保了可换向性。如果不是这种情况，材料可能不合适。
How do I know whether the certified value is valid for my method?
There are two CRM properties that describe the usefulness of a material for a certain method, namely traceability and commutability. Traceability describes what the certified value actually refers to including the definition of the measurand: is it about total or extractable element content, Kjeldahl or Dumans N? Commutability describes whether a material behaves similarly as a certain routine sample for a given method. Therefore, one should check whether the certified value of a CRM is traceable to the same reference as one’s method. If this is not the case, the material is unsuitable. Example: Certified values for dietary fibre traceable to a certain ISO method are only valid, if exactly this method is used. Additionally, one should check whether commutability is ensured. If this is not the case, the material may be unsuitable.
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