The Calibration of Indicator Dyes for the Measurement of Oceanic pH

本研究的最终目标是建立分光光度法pH测量作为海洋二氧化碳系统研究的关键分析方法。大部分工作将集中在校准染料作为pH指示剂，直接参考使用高度可重复的氢/银-氯化银电池的测量结果。还将进行额外的工作，以评估指示染料的稳定性和市售化学品中杂质的重要性。实验也将进行，以证明这些pH值测量溶解无机碳，总碱度，和f（CO2）。此外，还将建立一个额外的pH缓冲液，用于电法测量海洋pH。与NOAA人员的二氧化碳系统测量相结合，将在北太平洋获得详细和精确的pH值剖面。拟议的工作包括测量由NOAA人员分析的每个海水样品的分光光度pH值，以测定总无机碳、CO2分压和总碱度。这些测量将用于协助NOAA对海洋-大气二氧化碳交换的长期调查，也将用于验证pH值测定的准确性，包括碱度、总二氧化碳、二氧化碳分压和pH值数据集。

The final goal of the research is to establish spectrophotometric pH measurements as a key analysis in the study of the oceanic carbon dioxide system. The bulk of the work will be focussed on calibrating the dyes for use as pH indicators by direct reference to measurements using the highly reproducible hydrogen/silver- silver chloride cell. Additional work will be performed to assess the stability of the indicator dyes and the importance of impurities in commercially available chemicals. Experiments will also be conducted to demonstrate that these pH measurements of dissolved inorganic carbon, total alkalinity, and f(CO2). Furthermore, an additional pH buffer for use in the electrometric measurement of oceanic pH, will be established. Detailed and precise pH profiles will be obtained in the North Pacific Ocean in conjunction with the CO2 system measurements of NOAA personnel. The proposed work entails measurements of spectrophotometric pH on each seawater sample analyzed by NOAA personnel for total inorganic carbon, CO2 partial pressure, and total alkalinity. These measurements will be used to assist in long term NOAA investigations of oceanic-atmospheric CO2 exchange and will also be used to verify the accuracy of pH determinations involving in alkalinity, total CO2, pCO2 and pH data sets.