| 摘要 |
PURPOSE:To make it possible to carry out highly precise measurement, by constituting the titled apparatus from such a mechanism that the measurement error of objective ion concn. based on the difference in the ion strength of a sample to be measured can be compensated by the output signal from a conductivity measuring part. CONSTITUTION:The range adjustment of a display part is carried out by a standard liquid while operating factors are stored in an operation part. The factors are the ion concn. Cs, the K value and potential difference es of the standard liquid and the conductivity of a sample is measured while total ion strength I is operated based on he factors set in the operation part and coefficient of activity is operated by this value while operation potential ei from the concn. Cs is operated from a Nernst formula. By using preliminarily stored es, a value eo of difference with ei is asked. This value comes to approximate potential difference for compensating measurement error due to the difference in ion strength. By adding this potential difference to actually measured potential difference being the output from a potential difference detector, compensated potential difference (ex+eo) is determined. |
