The Calibration of Indicator Dyes for the Measurement of Oceanic pH

研究的最终目标是建立 分光光度法pH测量作为关键分析， 海洋二氧化碳系统的研究。 大部分 工作将集中在校准染料用于pH 直接参照使用高度相关的 可重复的氢/银-氯化银电池。 将进行额外的工作，以评估 指示剂染料和杂质的重要性， 市售化学品。 实验也将 进行，以证明这些pH值测量是 与溶解的 无机碳、总碱度和f（CO2）。 此外，委员会认为， 用于电测量的额外pH缓冲液 将建立海洋pH值测量。 详细和 将在北太平洋获得精确的pH值剖面 结合NOAA的CO2系统测量， 人员的 拟议的工作需要衡量 用分光光度法对NOAA分析的每个海水样品进行pH值测定 总无机碳、CO2分压和 总碱度 这些测量结果将用于协助 NOAA对海洋大气CO2的长期调查 交换，也将用于验证pH值的准确性 通过演示对指示染料的测定 碱度、总CO2、pCO 2和pH数据的内部一致性 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 are thermodynamically consistent with 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 indicator dyes by demonstrating internal consistency in alkalinity, total CO2, pCO2 and pH data sets.