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液膜钙离子选择电极(简称钙电极,下同)几经改良,现多用二(2-异辛基苯基磷酸)钙为活性物质,溶于二正辛基苯基磷酸酯,并固定于聚氯乙烯中制成。钙电极在生物医学研究和临床医学方面已成为一种新的有力工具。我们试图用钙电极指示络合滴定的终点来测定尿中钙含量。用钙电极指示滴定终点来测定溶液中的钙含量时,如果溶液中只有Ca~(2+)存在,电极电位只随Ca~(2+)活度改变,因而可用来指示滴定终点。但是,尿中除Ca~(2+)外,还有许多其他离子,其中H~+和Mg~(2+)对电极电位有明显影响。如调整待测溶液的pH在碱性范
Liquid film calcium ion selective electrode (hereinafter referred to as calcium electrode, the same below) after several improvements, are now more with two (2-isooctylphenyl phosphate) calcium as active substance, dissolved in di-n-octylphenyl phosphate and fixed in the poly Made of vinyl chloride. Calcium electrodes have emerged as a powerful new tool in biomedical research and clinical medicine. We attempted to measure the urinary calcium content by using a calcium electrode to indicate the end of complexometric titration. When using calcium electrode to indicate the end point of titration to determine the calcium content in the solution, the potential of the electrode is only changed with the activity of Ca ~ (2+) if there is only Ca ~ (2+) in the solution, so it can be used to indicate the end point of the titration. However, in addition to Ca 2+, there are many other ions in the urine, in which H + and Mg 2+ have a significant effect on the electrode potential. Such as adjusting the pH of the solution under test in the alkaline range