The CCQM-K148.a comparison was coordinated by the BIPM on behalf of the CCQM Organic Analysis Working Group for NMIs and DIs which provide measurement services in organic analysis under the CIPM MRA. It was undertaken as a "Track A" comparison within the OAWG strategic plan. CCQM-K148.a demonstrates capabilities for assigning the mass fraction content of a solid organic compound having moderate molecular complexity, where the compound has a molar mass in the range (75 - 500) g/mol and is non-polar (pK_ow < −2), when present as the primary organic component in a neat organic solid and where the mass fraction content of the primary component in the material is in excess of 950 mg/g.

Participants were required to report the mass fraction of Bisphenol A present in one supplied unit of the comparison material. Participants using a mass balance method for the assignment were also required to report their assignments of the impurity components present in the material. Methods used by the seventeen participating NMIs or DIs were predominantly based on either stand-alone mass balance (summation of impurities) or qNMR approaches, or the combination of data obtained using both methods. The results obtained using thermal methods based on freezing-point depression methods were also reported by a limited number of participants. There was excellent agreement between assignments obtained using all three approaches to assign the BPA content.

The assignment of the values for the mass fraction content of BPA consistent with the KCRV was achieved by most of the comparison participants with an associated relative standard uncertainty in the assigned value in the range (0.1 - 0.5)%.

To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

CCQM-K148.a 比较由 BIPM 代表 CCQM 有机分析工作组为 NMI 和 DI 进行协调，这些工作组在 CIPM MRA 下提供有机分析的测量服务。它是作为 OAWG 战略计划中的“A 轨道”比较进行的。CCQM-K148.a 展示了分配具有中等分子复杂性的固体有机化合物的质量分数含量的能力，其中该化合物的摩尔质量在 (75 - 500) g/mol 范围内并且是非极性的 (pK _ow < -2)，当作为纯有机固体中的主要有机组分存在并且材料中主要组分的质量分数含量超过 950 mg/g 时。

参与者被要求报告一个供应单位的比较材料中双酚 A 的质量分数。使用质量平衡方法进行分配的参与者还需要报告他们对材料中存在的杂质成分的分配。17 个参与的 NMI 或 DI 使用的方法主要基于独立质量平衡（杂质总和）或 qNMR 方法，或使用这两种方法获得的数据的组合。有限数量的参与者也报告了使用基于凝固点降低方法的热方法获得的结果。使用所有三种方法分配 BPA 内容获得的分配之间存在极好的一致性。

与 KCRV 一致的 BPA 质量分数含量值的分配是由大多数比较参与者实现的，分配值的相关相对标准不确定度在 (0.1 - 0.5)% 范围内。

要访问本文的正文，请单击最终报告。请注意，此文本出现在 BIPM 密钥比较数据库 https://www.bipm.org/kcdb/ 的附录 B 中。

根据 CIPM 互认安排 (CIPM MRA) 的规定，最终报告已通过同行评审并由 CCQM 批准发布。