1·Because the oxidation ability of ammonium cerous sulfate was affected by acidity and concentration of solution, we discuss and select their optimization.
因为硫酸铈铵溶液的氧化能力与溶液的酸度和浓度有较大的关系，故讨论了溶液的酸度和浓度的选择。
2·Methods: the cerous sulfate 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。