Temperature compensation of conductivity

1The relationship between conductivity and temperature:

The conductivity of a solution is similar to the resistivity of a metal, both of which are affected by temperature. As the temperature increases, the ion movement speed increases, and the conductivity also increases. At low concentrations (<0.05mol/L), the relationship between conductivity and temperature can be expressed by the following equation:

gt=g0[1+β1(t-t0)+ β2(t-t0)2]

In the equation, g0 and gt correspond to the conductivity at temperatures t0 and t, respectively; β 1 and β 2 are the temperature coefficients of conductivity, respectively. The value of β 2 (t-t0) 2 in the second term is relatively small and can be ignored. Therefore, the measured conductivity at a water temperature of t ℃ should be converted to the conductivity at 25 ℃ using the following formula: g25=; In the formula, g25 represents the conductivity at 25 ℃, and gt represents the conductivity measured at a water temperature of t ℃; β is the temperature coefficient of conductivity, and as the temperature increases, β decreases. At room temperature, the beta value of acidic solution is about 0.016/℃, alkaline solution is about 0.019/℃, and salt solution is about 0.024/℃, with an average value of 0.022/℃.

2The conductivity g and temperature coefficient β of common aqueous solutions1：