CCQM-K143 is a key comparison that assesses participants' ability to prepare single element calibration solutions. Preparing calibration solutions properly is the cornerstone of establishing a traceability link to the International System of Units (SI), and therefore should be tested in order to confirm the validity of CCQM comparisons of more complex materials. CCQM-K143 consisted of participants each preparing a single copper calibration solution at 10 g/kg copper mass fraction and shipping 10 bottled aliquots of that solution to the coordinating laboratory, the National Institute of Standards and Technology (NIST). The masses and mass fraction for the prepared solutions were documented with the submitted samples.

The solutions prepared by all participants were measured at NIST by high performance inductively coupled plasma optical emission spectroscopy (HP-ICP-OES). The intensity measurements for copper were not mapped onto values of mass fraction via calibration. Instead, ratios were computed between the measurements for copper and simultaneous measurements for manganese, the internal standard, and all subsequent data reductions, including the computation of the KCRV and the degrees of equivalence, were based on these ratios. Other than for two participants whose measurement results appeared to suffer from calculation or preparation errors, all unilateral degrees of equivalence showed that the measured values did not differ significantly from the KCRV. These results were confirmed by a second set of ICP-OES measurements performed by the Physikalisch-Technische Bundesanstalt (PTB). CCQM-K143 showed that participants are capable of preparing calibration solutions starting from high purity, assayed copper metal. Similar steps are involved when preparing solutions for other elements, so it seems safe to infer that similar capabilities should prevail when preparing many different, single-element solutions.

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 kcdb.bipm.org/.

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-K143是评估参与者准备单元素校准解决方案的能力的关键比较。正确准备校准解决方案是建立与国际单位制（SI）的可追溯性链接的基石，因此应进行测试，以确认更复杂材料的CCQM比较的有效性。CCQM-K143由参加者组成，每个参加者准备一个铜质含量为10 g / kg的单一铜校准溶液，并将该溶液的10瓶瓶装等分试样运送至协调实验室，即美国国家标准技术研究院（NIST）。所制备溶液的质量和质量分数与提交的样品一起记录在案。

所有参与者准备的溶液均在NIST处通过高效电感耦合等离子体发射光谱（HP-ICP-OES）进行测量。铜的强度测量值未通过校准映射到质量分数值上。取而代之的是，在这些铜的测量结果与同时进行的锰，内标测量结果之间的比率被计算出来，所有后续的数据减少，包括KCRV的计算和当量度，都基于这些比率。除了两个参与者的测量结果似乎受到计算或准备误差的影响外，所有单方面的等效程度都表明，测量值与KCRV并无显着差异。这些结果通过Physikalisch-Technische Bundesanstalt（PTB）进行的第二组ICP-OES测量得到了证实。CCQM-K143表明，参与者能够从高纯度，经分析的铜金属开始制备校准溶液。在为其他元素准备解决方案时，涉及到类似的步骤，因此可以推断，在准备许多不同的单元素解决方案时，应具有相似的功能。

要获得本文的正文，请单击“最终报告”。请注意，此文本显示在BIPM密钥比较数据库kcdb.bipm.org/的附录B中。

根据CIPM相互认可安排（CIPM MRA）的规定，最终报告已由CCQM进行同行评审并批准发布。