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一、离子选择电极分析测量的误差来源由离子选择电极、参比电极、样品溶液或标准溶液及离子计组成的测量体系,其误差的可能来源包括下列五个方面: (1)离子选择电极误差。主要是电极响应特性例如电极标准电势及斜率漂移引起的误差,也包括存在干扰物质及基体离子强度变化等反映到电极响应上的误差。 (2)参比电极误差。主要包括参比电极电势漂移以及液接界电势的变化(残余液接界电势)引起的误差。
I. Sources of Errors for Ion Selective Electrode Analysis Sources of Errors The possible sources of errors in the measurement system consisting of an ion-selective electrode, a reference electrode, a sample solution or a standard solution and an ion meter include the following five aspects: (1) Ion-selective electrode error . Mainly electrode response characteristics such as electrode standard potential and slope error caused by drift, but also includes the presence of interfering substances and matrix ion intensity changes reflected in the electrode response error. (2) Reference electrode error. Mainly including the reference electrode potential drift and liquid junction potential changes (residual liquid junction potential) caused the error.