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     

张潇  叶瑛  阚雅婷  黄元凤  贾健君  赵玥  陈镇东  秦华伟 《海洋学报(英文版)》2017,36(5):99-104

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 highprecision 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 Li OH 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/Ag Cl 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 0–40m water depth. In addition, the high precision and accuracy of the sensor make it possible to use in the ocean observation field.  相似文献   

浙江方家山高岭土矿床中高岭石亚族矿物的研究   总被引：4，自引：0，他引：4  

沈忠悦  叶瑛 《岩石矿物学杂志》1995,14(1):57-64

珍珠陶石、地开石和高岭石是高岭石亚族矿物的三种多型。其中高岭石最常见,地开石较少见,而珍珠陶石是十分罕见的多型。本文作者应用Ｘ射线衍射、红外光谱和醋酸钾夹层化合物的方法,研究了浙江方家山高岭石矿物特征。研究表明,用醋酸钾为夹带剂形成的珍珠陶石夹层化合物具有１４．０的特征衍射峰,经水分子取代后形成８．３５特征的珍珠陶石水合化合物,而高岭石仅部分形成７．３０水合夹层化合物。从而确定了方家山高岭土矿床是以高岭石为主含珍珠陶石的矿床,其珍珠陶石主要赋存于粗粒级的高岭土中。高岭石与珍珠陶石晶畴呈消长关系可能说明珍珠陶石是后期较强应力下由高岭石转变来的。  相似文献