| ZHANG Xiao,YE Ying,KAN Yating,HUANG Yuanfeng,JIA Jianjun,ZHAO Yue,CHEN Chen-Tung Arthur,QIN Huawei. 2017. A new electroplated Ir/Ir(OH)x pH electrode and its application in the coastal areas of Newport Harbor, California. Acta Oceanologica Sinica, 36(5):99－104 |
| A new electroplated Ir/Ir(OH)x pH electrode and its application in the coastal areas of Newport Harbor, California |
| 一种新型电镀法制备的Ir/Ir(OH)x pH电极及其在加州纽波特港海域的应用研究 |
| Received:March 07, 2016 |
| DOI：10.1007/s13131-017-1064-5 |
| Key words:Ir/Ir(OH)(OH)x electrode pH value electroplating Newport Harbor California |
| 中文关键词: Ir/Ir(OH)x电极 pH值 电镀 加州纽波特港 |
| 基金项目:The Key Laboratory Project of State Oceanic Administration for Marine Ecosystem and Biogeochemistry of China under contract No. 529101-X21601; the Foundation from Wendy Schmidt Ocean Health XPRIZE and the Southern California Coastal Water Research Project. |
| Author Name | Affiliation | E-mail | | ZHANG Xiao | Ocean College, Zhejiang University, Zhoushan 316000, China | | | YE Ying | Ocean College, Zhejiang University, Zhoushan 316000, China | | | KAN Yating | Ocean College, Zhejiang University, Zhoushan 316000, China | | | HUANG Yuanfeng | Ocean College, Zhejiang University, Zhoushan 316000, China | | | JIA Jianjun | Ocean College, Zhejiang University, Zhoushan 316000, China | | | ZHAO Yue | Ocean College, Zhejiang University, Zhoushan 316000, China | | | CHEN Chen-Tung Arthur | Ocean College, Zhejiang University, Zhoushan 316000, China
Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, China | | | QIN Huawei | School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China | qinhw@hdu.edu.cn |
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| Abstract: |
| Resulting from the rising levels of atmospheric carbon, ocean acidification has become a global problem. It has significant impacts on the development, survival, growth and physiology of marine organisms. Therefore, a high-precision sensor is urgently needed to measure the pH of sea-water. Iridium wire with a diameter of 0.25 mm is used as the substrate, and an Ir/Ir(OH)x pH electrode is prepared by a one-step electrochemical method in a LiOH solution at the room temperature. A scanning electron microscope (SEM) observation reveals that it is coated with nanoscale particles. In laboratory tests, the electrode exhibits a very promising pH response, with an ideal Nernst slope (56.14-59.52), fast response, good stability and long life-span in tested pH buffer solutions. For a sea trial, four pH electrodes and one Ag/AgCl reference electrode are integrated with a self-made chemical sensor, and a profile detection of nearly 70 m is implemented near Newport Harbor, California on August 3, 2015. The results reflect that the pH value measured by the sensor is very close to the data given by Sea-Bird 911 plus CTD, with a difference value ranging from 0.000 075 to 0.064 719. And the sensor shows a better data matching degree in 0-40 m water depth. In addition, the high precision and accuracy of the sensor make it possible to use in the ocean observation field. |
| 中文摘要: |
| 大气中CO2含量逐年上升，海洋酸化已经成为一个世界性难题。它对生态环境及人类的发展都产生着不可忽视的影响。因此，我们需要一个高精度传感器来监测海水pH值。本研究中传感器使用Ir/Ir（OH）x电极，制备时以直径为0.25mm的铱丝为基材，在室温条件下通过电化学法在其上原位合成Ir（OH）x膜。SEM图像显示铱丝表面包覆有纳米级颗粒的膜。该电极具有良好的能斯特斜率，并具有响应快速、稳定性与重现性好、寿命长的优点。将四支该方法制备的pH电极与一支参比电极集成于自制化学传感器，在加州纽波特港进行海试作业。结果显示，该传感器测得海水pH值与Sea-Bird 911 plus CTD测得数据十分接近，且在传感器下投和上拉过程中，数据吻合度更高。因此，自制海洋酸化传感器具有更高的精度和准确度。 |
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