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1 材料与方法11 抽样 按人口比例概率(ＰＰＳ)抽样方法,在全市抽取30个点,每点随机抽取40户居民户食盐样本。1.2 碘含量测定 采用中国地方病研究中心研制的碘盐检测箱,以硫代硫酸钠滴定法测定碘含量。结果≥20ｍｇ/ｋｇ～≤60ｍｇ/ｋｇ为合格加碘食盐,计算合格率。2 结果
1 Materials and Methods 11 Sampling According to the sampling rate of population proportionality (PPS), 30 sampling points were taken in the whole city, and 40 samples of household salt were randomly selected from each sampling point. 1.2 Determination of iodine The use of iodine salt test center developed by the China Institute of endemic diseases detection box, determination of iodine content by sodium thiosulfate titration. Results ≥ 20mg / kg ~ ≤ 60mg / kg as qualified iodized salt, calculate the pass rate. 2 results