A new electroplated Ir/Ir(OH)_x pH electrode and its application in the coastal areas of Newport Harbor, California
A new electroplated Ir/Ir(OH)_x pH electrode and its application in the coastal areas of Newport Harbor, California作者机构：Ocean College Zhejiang University Institute of Marine Geology and Chemistry National Sun Yat-sen University School of Mechanical Engineering Hangzhou Dianzi University
出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)
年 卷 期：2017年第36卷第5期
页 面：99-104页
核心收录：
学科分类：070702[理学-海洋化学] 07[理学] 0707[理学-海洋科学]
基 金：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
主 题：Ir/Ir(OH)x electrode pH value electroplating Newport Harbor California
摘 要：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 fife-span in tested pH buffer solutions. For a sea trial, four pH electrodes and one Ag/AgC1 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.
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