The Quality Control of Oceanic CO2 Measurements: Preparation and Distribution of Reference Materials

该项目的目标是继续为海洋二氧化碳测量的质量控制提供一种机制，特别是作为国际全球方案一部分进行的测量。这将有助于确保这些测量结果具有可比性和准确性，尽管它们是在不同的实验室在不同的时间进行的。这些测量是全球尺度调查航行的重要组成部分，例如全球海洋船舶水文调查方案的调查航行，并在海洋酸化测量的质量控制方面发挥重要作用。向国际社会提供参考材料有助于提高世界各地海洋碳数据的总体质量，既可用于海洋碳分布的实地研究，也可用于海洋酸化的相关研究。这是美国对该领域全球研究基础设施的重大贡献。许多学生参与，并通过该计划接受培训。为了实现上述目标，斯克里普斯实验室将为海水中海洋二氧化碳系统的以下参数准备和认证参考材料：总溶解无机碳、总碱度和pH值。总溶解无机碳和总碱度的参考材料将基于天然海水，经过灭菌、装瓶，并使用适当的参考方法对这些参数进行分析。pH参考物质基于合成海水中的Tris缓冲液，并使用分光光度计pH测量进行校准。此外，实验室将分发校准的酸性滴定剂，用于碱度测量。参考材料将分发给美国和国际调查人员，以协助海洋CO2测量的质量控制。在该项目的三年期间，实验室预计将分发约30，000瓶参考材料。这些材料也将用于提供测试样品，用于确定这些不同参数的分析方法的合作研究。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估的支持。

The goal of this project is to continue to provide a mechanism for the quality control of oceanic carbon dioxide measurements, in particular those that are made as part of international global programs. This will help to ensure that such measurements are comparable and accurate although made in different laboratories at different times. Such measurements are important components of global scale survey cruises such as those of the Global Ocean Ship-based Hydrographic Investigations Program (GO-SHIP), as well as playing a significant role in the quality control of ocean acidification measurements. The provision of reference materials to the international community helps to improve the overall quality of oceanic carbon data around the world both for field studies of the distribution of oceanic carbon, as well as for studies related to ocean acidification. It is a significant US contribution to global research infrastructure in this field. Numerous students are involved in, and receive training through, this program. To achieve the goal outlined above, the Scripps laboratory will prepare and certify reference materials for the following parameters of the oceanic carbon dioxide system in seawater: total dissolved inorganic carbon, total alkalinity, and pH. The reference materials for total dissolved inorganic carbon and for total alkalinity will be based on natural seawater, sterilized, bottled, and analyzed using appropriate reference methods for these parameters. Reference materials for pH are based on Tris buffers in synthetic seawater and calibrated using spectrophotometric pH measurements. In addition, the laboratory will distribute calibrated acid titrant for alkalinity measurements. Reference materials will be distributed to US and to international investigators to assist in the quality control of oceanic CO2 measurements. During the three years of this project, the laboratory expects to distribute about 30,000 bottles of reference material. These materials will also be used to provide test samples for use in collaborative studies of the analytical methods used to determine these various parameters.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.