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离子选择电极响应曲线的直线范围,不同电极并不相同,但大多数商品电极在纯标准溶液中的线性响应下限为10~(-5)—10~(-7)M,在实际测量体系中,由于各种原因,直线范围还要更窄,从线性下限到电极完全无响应的浓度之间,有一个范围可达几个数量级的响应曲线弯曲部份。要使离子选择电极的测量范围向低浓扩展,这一弯曲部份颇有利用价值。目前在实际分析中,对这一弯曲部份大致有下面这几种处理办法:1.在弯曲部份多做一些实验点,用紧密内插法查找试样浓度。用特制的测量杯使两对电极串联使用,可使曲线斜率
Ion-selective electrode response curve of the linear range, different electrodes are not the same, but most of the commercial electrode in pure standard solution linear response of the lower limit of 10 -5 (-5) -10 ~ (-7) M, in the actual measurement system , The line range is narrower for a variety of reasons and there is a bend in the response curve in the range of a few orders of magnitude between the lower linear limit and the fully non-responsive electrode. To make the measurement range of ion-selective electrode to low-concentration expansion, this curved part of the considerable use of value. At present, in actual analysis, there are roughly the following ways to deal with this bending part: 1. Make some experimental points in the bending part and find the sample concentration by using the compact interpolation method. With a special measuring cup so that the two pairs of electrodes in series, the slope of the curve