Development and Evaluation of pH and CO2 Microelectrodes for In Situ Determination of Deep Sea Pore Water Carbonate Chemistry and Carbon Recycling Rate

用于原位测定深海孔隙水碳酸盐化学和碳回收率的 pH 和 CO2 微电极的开发和评估

• 批准号: 9401908
• 负责人: Wei Cai
• 金额: $ 2.34万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-11-15 至 1995-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9401908&HistoricalAwards=false
• 关键词: Development; Evaluation; pH; CO2; Microelectrodes

9401908 CAI This project is aimed at developing a fast and stable pCO2 microelectrode based on a flat tip Iroxide pH microelectrode and evaluating the accuracy and applicability of pH and pCO2 sensors for measuring benthic carbon recycling rates and pore water CO2 chemistry. The pCO2 microelectrode will be a marked improvement of an earlier pCO2 sensor. It is planned to enhance and optimize the response rate, stability, and precision of the pCO2 electrode. The accuracy of the pH and pCO2 microelectrode measurements will be evaluated by profiling various laboratory incubated sediments and comparing the results with TCO2 concentrations from whole core squeezing samples. In situ measurements and evaluation also will be conducted in two coastal environments. A goal in the future is not only to collect high resolution and artifact-free in situ profiles with microelectrodes, but also to over-determine the pore water carbonate system by combining the in situ microelectrode measurements (O2,pH, and pCO2) and the in situ sampling techniques (TA, TCO2, and nutrients) in a single device. The measurements will define the O2/C/N ratios during organic carbon early digenesis. This strategy will also give the three state-of-the-art approaches, microelectrode, whole core squeezing, and benthic chamber incubation, a reliability and internal consistency check. This combined approach is essential for determining benthic response to the seasonal changes of C input and in delineating controls over the pore water carbonate system and CaCO3 preser- vation and dissolution.

小行星9401908 该项目的目的是开发一个快速和稳定的pCO 2微电极的基础上，一个扁平的Iroxide pH微电极和评估的准确性和适用性的pH值和pCO 2传感器测量底栖碳循环率和孔隙水CO2化学。 pCO 2微电极将是早期pCO 2传感器的显著改进。 计划增强和优化pCO 2电极的响应速率、稳定性和精密度。 pH值和pCO 2微电极测量的准确性将通过分析各种实验室培养的沉积物并将结果与整个岩心挤压样品的TCO 2浓度进行比较来评价。 还将在两个沿海环境中进行现场测量和评估。 未来的目标不仅是用微电极收集高分辨率和无伪影的原位剖面，而且通过将原位微电极测量（O2，pH和pCO 2）和原位采样技术（TA，TCO 2和营养物）结合在单个设备中来过度确定孔隙水碳酸盐系统。 这些测量将确定有机碳早期成岩作用期间的O2/C/N比值。 这一战略还将对三种最先进的方法-微电极法、整个岩心挤压法和底栖室孵化法-进行可靠性和内部一致性检查。 这一综合方法对于确定底栖生物对C输入季节变化的响应以及描述对孔隙水碳酸盐系统和CaCO 3保存和溶解的控制是必不可少的。