KTiOPO_4单晶膜钾离子选择性电极的研究  

Study on Potassium-Selective Electrode Using KTiOPO_4 Single Crystal Membrane as an Ion Carrier

作　　者：刘学勇[1] 马长勤[1] 蒋德华[1] 沈静兰[1] 

机构地区：[1]山东大学化学院,济南250100

出　　处：《化学学报》1995年第8期801-804,共4页Acta Chimica Sinica

摘　　要：本文采用KTiOPO_4单晶薄片作为离子活性传感膜,制备了钾离子选择性电极.20℃时,其线性响应范围为1.2×10^(-5)～1.0mol·dm^(-3)氯化钾溶液,平均响应斜率为58mV/-1ga_K,对钠离子的电位选择性系数为4.0×10^(-4).该电极的优点是电极斜率受酸度变化影响小,稳定性和重现性好,寿命长.A new potassium ion selective electrode is proposed, in which the KTiOPO4 single crystal membrane is used as the electroactive material. The slope of response is determined to be 58mV/ -lgaK by means of computer fitting. The selective coefficients in relation to Na+ is 4.0×10-4. The advantages of this electrode are that its slope can be hardly influenced by the variation of the pH value; its stability, repeatability and its long lifetime as well.

关 键 词：离子选择性电极 电极斜率 磷酸钛酰钾 

分 类 号：O627.22[理学—有机化学] O657.15[理学—化学]