Abstract
This study was carried out to improve the analytic accuracy of the low content of hexacyanoferrate (II) contained in table salt. Using a membrane filter, filtration and separation were performed for prussian blue, formed by iron (II) sulfate solution, and the applicability of the methods of measuring Fe intensity by X-ray fluorometry, of dissolving the filter and measuring absorbance was examined.
In the presence of NaCl, part of prussian blue dissolved when the filtration filter was washed with water, and the recovery rate fell. However, concentration and separation was performed without forming soluble prussian blue by iron (II) sulfate solution with iron chloride solution (0.005mol/1). Consequently, measurement became possible by employing X-ray fluorometry and absorption spectrochemical analysis. As a result, each calibration curve was observed to be a straight line using the previous two methods, and NaCl had no effect on the measurement. By using this method, measurement of 0.1 mg/kg became possible.
