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    All-Solid-State pH Sensor Used in Oil Drilling Mud

    Year: 2013

    Journal: ELECTROANALYSIS, Vol. 25, p 223-229, 20150703

    Authors: Lorant, Stephanie; Bohnke, Odile; Breviere, Jerome; Bohnke, Claude

    Organizations: Univ Maine, LUNAM Univ, CNRS, Inst Mat & Mol Mans,UMR 6283,Dept Oxydes & Fluoru, F-72085 Le Mans 9, France; Schlumberger, Geoserv, Roissy En France, France

    A new all-solid-state pH sensor combining an Ion-Selective Electrode (ISE) for pH measurements and an all-solid-state reference electrode using a lithium ion conducting ceramic is presented. The use of a liquid internal reference in commercialized pH and reference electrodes leads to important drawbacks that considerably limit their use for in-situ measurements. The manufacturing and properties of an all-solid-state reference electrode made of the ceramic Li0.3La0.57TiO3 (LLTO) and an all-solid-state pH microelectrode are described. Both electrodes are combined to prepare an all-solid-state pH sensor which can be used in different applications such as medicine, food industry or oil or water drilling industries.