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2 3份 KIO3碘盐散装暴露在空气中 ,在自然条件下常温常湿存放 ,存放第 2 2个月后碘下降 0 .31% (t=0 .1974,P=0 .845 3) ,存放第 32个月碘下降 6 .40 (t=4.2 412 ,P<0 .0 1) ,存放第 36个月碘下降 9.0 8 (t=4.980 8,P<0 .0 1) ,存放第 6 0个月碘下降 10 .2 6 (t=10 .5 2 95 ,P<0 .0 1) ,存放第 84个月碘下降 19.6 7 (t=8.5 2 88,P<0 .0 1) ,存放第96个月碘下降 2 5 .5 2 (t=9.330 5 ,P<0 .0 1) ,存放第 10 8个月碘下降 2 8.6 1 (t=10 .5 2 41,P<0 .0 1) ,其中第 36、5 4、6 0、84、96、10 8个月存放期的碘盐样品均有程度不同的碘下降 ,碘下降率与其样品含碘量呈负相关 ,提示 KIO3碘盐化学性质稳定 ,在碘盐商业流通周期内碘含量基本不变 ,建议将出厂盐、销售盐、用户盐含碘合格浓度统一为一种标准 ,其含碘的合格浓度≥ 40 mg/ kg
2 3 KIO3 iodized salt bulk exposed to air, stored under normal conditions at normal temperature and humidity, iodine decreased 0.31% (t = 0.1974, P = 0. 845 3) The iodine in the 32th month decreased by 6.40% (t = 4.2121, P <0.01), and the iodine in the 36th month decreased by 9.08% (t = 4.9808, P <0.01) Iodine decreased 60.6 months (t = 10.52 95, P <0.01) in the 6 months and decreased 19.6 7 (t = 8.5288, P <0. 0) in the 84th month (T = 9.330 5, P <0.01), and the iodine in the storage of the 108th month decreased by 2 8.61 (t = 10 .5 2 41 , P <0.01). Among the iodized salt samples stored on the 36th, 54th, 60th, 84th, 86th, 86th, and 8th months, iodine levels decreased to different degrees. The iodine reduction rate and the iodine content in samples Negative correlation, suggesting that the chemical properties of KIO3 iodized salt are stable. The iodine content in the circulating period of iodized salt is basically the same. It is suggested that the qualified concentration of iodine in the production salt, the sales salt and the user salt should be unified as a standard, ≥ 40 mg / kg