Rationale

The proposed revision to section 6.4.1 identifies the specific analytical column used during the interlaboratory study that established the precision and bias of this method. The column should be referenced by commercial source because it is only available from a single supplier. This is consistent with ASTM Form & Style, § F4.3.2, which permits reference to specific commercial sources of supply when there is a sole source. Including this reference ensures clarity and supports reproducibility of the method.