抄録
We applied transient isotachophoresis (tITP) / capillary zone electrophoresis （CZE） with direct UV detection to simultaneous determination of I- and IO3- in salts. The limit of detection （LOD, signal-to-noise ratio (S/N）＝3）） and limit of quantification （LOQ, S/N＝10） respectively reached 0.010 and 0.033 mg/L for I-, and 0.050 and 0.17 mg/L for IO3- （as I）. The respective values of the relative standard deviation （RSD, n＝4） of the peak area, peak height, and migration time were 1.2, 1.1, 0.20 % for I- and 5.3, 1.8, 0.17 % for IO3-. Linear calibration graphs were obtained for I- and IO3- using both the peak area and peak height. The proposed method was used to find I- and IO3- in salt samples including seaweed salts. The seaweed salts contained 3.82 ‒ 46.8 mg/kg of I- （calibration graph method）, but IO3- was not detected in the salts used for this experiment. Results for I- obtained using the calibration graph for the peak area agreed with those obtained using the standard addition method. The recoveries were 100 ‒ 105 % for I- and 90.0 ‒ 97.5 % for IO3- when analyzing sun-dried salt solutions with 0 ‒ 0.40 mg/L I- and IO3-.
