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    • 7. 发明申请
    • ELECTROCHEMICAL SENSOR
    • 电化学传感器
    • WO2012059708A1
    • 2012-05-10
    • PCT/GB2011/001509
    • 2011-10-20
    • SCHLUMBERGER TECHNOLOGY B.V.SCHLUMBERGER HOLDINGS LIMITEDSCHLUMBERGER CANADA LIMITEDSERVICES PETROLIERS SCHLUMBERGERPRAD RESEARCH AND DEVELOPMENT LIMITEDLAWRENCE, NathanMEREDITH, Andrew
    • LAWRENCE, NathanMEREDITH, Andrew
    • G01N27/30G01N27/48
    • G01N27/30G01N27/302G01N27/4167
    • A voltammetric pH sensor, especially for characterising wellbore fluids, comprises a plurality of electrodes with a redox active organic compound attached to an electrode and having at least one functional group convertible electrochemically between reduced and oxidized forms with transfer of at least one proton between the compound and surrounding aqueous phase, wherein the compound has at least one substituent group which promotes hydrogen bonding at a said functional group and thereby increases the reaction rate of proton transfer. The substituent group may form an internal hydrogen bond with a redox-convertible group or may enhance polarity to promote electrostatic interaction with water molecules and reduce activation energy. Typical examples include alizarin or 1, 2 - dihydroxy- anthraquinone (RH=72 - 48 - 0 ), quinizarin or 1, 4 - dihydroxy- anthraquinone (RN=81 - 64 - 1), 2 - acetoxy-benzoquinone (RN=1125 - 55 - 9 ), chloranil or 2, 3, 4, 5 - tetrachloro -benzoquinone (RN=118 - 75 - 2 ) and 1, 4 - diamino - 2, 3 - dichloro - anthraquinone (RN=81 - 42 - 5 ) deposited on a glassy carbon electrode. In this way, anomalous measurements at low ionic strenght and low concentrations of pH buffering species can be overcome.
    • 特别是用于表征井筒流体的伏安pH传感器包括多个电极,其具有连接到电极上的氧化还原活性有机化合物,并且具有至少一个可在还原和氧化形式之间电化学转化的官能团,其中化合物之间至少一个质子转移 和周围的水相,其中所述化合物具有至少一个在所述官能团上促进氢键的取代基,从而提高质子转移的反应速率。 取代基可以与氧化还原可转换基团形成内部氢键,或者可以提高极性以促进与水分子的静电相互作用并降低活化能。 典型的实例包括茜素或1,2-二羟基 - 蒽醌(RH = 72-48-0),茜素或1,4-二羟基 - 蒽醌(RN = 81-64-1),2-乙酸基 - 苯醌(RN = 1125 - 55 - 9),氯醌或2,3,4,5-四氯 - 苯醌(RN = 118 - 75 - 2)和1,4-二氨基-2,3-二氯 - 蒽醌(RN = 81 - 42 - 5 )沉积在玻璃碳电极上。 以这种方式,可以克服低离子强度和低浓度pH缓冲物种的异常测量。