High-throughput and precise measurement method for electrolytic conductivity in a higher conductivity range (10 S m−1 to 0.1 S m−1) by chromatography system with conductivity detector

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

“…According to the research from Asakai et al, an EC meter as a detector of an ion chromatography showed higher solution resistance (lower EC) than that of the actual value, especially in the measuring range of EC more than ca. 0.1 S m -1 [11]. On the other hand, according to the research of Thirstrup et al, ECs obtained between the primary measurement system and commercial EC cells were almost identical in the measuring range from ultrapure water to ca.…”

“…NMIJ secondary Jones-type cell used in this study was previously described [11]. This cell is constructed with a rigid geometry: The cell volume and the positions of the electrodes are rigidly fixed [11], and have two platinum electrodes (ca. 20 mm diameter), which were facing away ca.…”

“…In our previous study, we confirmed that the cell constant of our National Metrology Institute of Japan (NMIJ) secondary Jones-type cell (Figure 1(a)) obtained by calibration using the solutions from 0.1 S m -1 to 10 S m -1 was identical within ca. 0.5% expanded uncertainty [11]. According to the research from Asakai et al, an EC meter as a detector of an ion chromatography showed higher solution resistance (lower EC) than that of the actual value, especially in the measuring range of EC more than ca.…”

“…The cell for the measurement of EC can be classified into two types, primary and secondary cells, in accordance with the method to determine their cell constant [11]. The primary cell is used for absolutely measurement of EC; therefore, its cell constant should be determined accurately by only its geometric parameters such as length (l) and crosssectional area (A) of the solution in which the actual current is flowing.…”