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迄今为止,Gran法以直线外推法计算结果,而此法涉及的直线的斜率和截距两个参数的误差基本上是迭加的,因此误差较大。本文导出了简单、准确的斜率法计算公式,并在此基础上提出了一个由斜率法和外推法组合的Gran法计算图。 1.方法的理论基础和计算公式的导出: (1)理论基础:设被测试液的浓度为C_0,体积为V_0,电动势为E_0;于试液中连续I次加入浓度为C_s的标液体积分别为V_s 毫升,加入的总体积为VsI毫升,得到相应的电动势为E_I 毫伏。如令△E_I=E_I-E_0;x=C_sV_g/C_0V_0;a=V_g/V_0;y_r=(1+al)10~(△E)_I~(/S),则有
So far, the Gran method to calculate the results of linear extrapolation, and this method involves the slope and intercept of the two parameters of the error is basically superimposed, so the error is larger. In this paper, a simple and accurate method for calculating the slope method is derived, and on the basis of this, a Gran calculation diagram combining the slope method and the extrapolation method is proposed. 1. The theoretical basis of the method and the derivation of the calculation formula: (1) Theoretical basis: Set the concentration of the tested solution as C_0, the volume of V_0 and the electromotive force as E_0; add the concentration of the standard liquid of concentration C_s to the test solution continuously for one time Do not V_s ml, adding the total volume of VsI ml, get the corresponding electromotive force E_I millivolts. If ΔE_I = E_I-E_0; x = C_sV_g / C_0V_0; a = V_g / V_0; y_r = (1 + al) 10 ~ (ΔE) _I ~ (/ S)