Applicable Measuring Range of Two-Electrode Type Commercial Electrolytic Conductivity Meter for Accurate Determination of Electrolytic Conductivity

Figure 4

Obtained cell constants of NMIJ secondary Jones-type cell calibrated using 3 NMIJ CRMs (0.01 mol kg^-1, 0.1 mol kg^-1, and 1 mol kg^-1 of KCl aqueous solutions). The bars were expanded uncertainties () which were estimated by the combination of the following uncertainties: resistances of the LCR meter (0.025%), thermometer (0.008%), measurement repeatability (less than 0.1%), and the certified value of NMIJ CRMs. The uncertainty of NMIJ CRMs (0.01 mol kg^-1, 0.1 mol kg^-1, and 1 mol kg^-1 of KCl aqueous solution) was 0.28%, 0.16%, and 0.23%, respectively.