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在离子选择电极法中,Gran计算图具有多种用途,如用于计算加入标准法和电位滴定法的分析结果等。大家知道,一般的Gran图是根据电极响应的能斯特斜率为58毫伏(对一价离子)或29毫伏(对二价离子)来绘制的。然而,由于温度的变化,特别是由于电极性能的变化常使电极的响应斜率偏离58或29毫伏,甚至相差较远。如这时仍采用一般的Gran图进行计算,则会带来较大的误差。为了使Gran图能适用于不同响应斜率的离子选择电极,我们曾提出不用E而用△E
In the ion-selective electrode method, Gran calculated plots for a variety of purposes, such as used to calculate the addition of standard method and the potential titration analysis results. As you know, a typical Granogram is plotted based on the Nernst slope of the electrode response of 58 millivolts (for monovalent ions) or 29 millivolts (for divalent ions). However, the response slope of the electrode, due to changes in temperature, can often deviate even further from 58 or 29 mV, particularly due to changes in electrode performance. If this time is still using the general Gran graph to calculate, it will bring greater error. In order for the Granogram to be suitable for ion-selective electrodes with different response slopes, we have proposed to use E