Methods: the ceroussulfate reducing reaction was used according to the preventive and curative criteria of iodine deficiency drawn up by WHO and ICCIDD.
方法：采用WHO与ICCID制定的《碘缺乏病防治标准与方法》中的硫酸铈法。
2
Because the oxidation ability of ammonium ceroussulfate was affected by acidity and concentration of solution, we discuss and select their optimization.