The Calibration of Indicator Dyes for the Measurement of Oceanic pH

这项研究的最终目标是建立分光光度法pH测量作为研究海洋二氧化碳系统的关键分析。大部分工作将集中在通过直接参照使用重复性高的氢/银-氯化银电池的测量来校准用作pH指示剂的染料。还将开展其他工作，以评估指示染料的稳定性以及市场上可获得的化学品中杂质的重要性。还将进行实验，以证明这些溶解无机碳、总碱度和f(CO2)的pH测量。此外，还将建立一个额外的pH缓冲液，用于海洋pH的电测测量。将结合美国国家海洋和大气局工作人员的二氧化碳系统测量，获得北太平洋详细和准确的酸碱度曲线。拟议的工作包括测量由NOAA人员分析的每个海水样本的总无机碳、二氧化碳分压和总碱度的分光光度pH。这些测量将用于协助美国国家海洋和大气层管理局对海洋-大气二氧化碳交换的长期调查，还将用于核实涉及碱度、总二氧化碳、二氧化碳分压和pH值数据集的pH值测定的准确性。

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.