新疆盐湖化工厂碘盐含碘量的监测报告

A Monitoring Report on Iodized Salt Produced by Yanhu Chemical Plant of Xinjiang

新疆维吾尔自治区规定北疆地区碘盐的加碘比例为３０ｐｐｍ，１９９２年自治区ＩＤＤ监测中心对新疆最大的碘盐生产基地──盐湖化工厂生产的碘盐进行了监测，其结果分别为粉洗精细加碘盐平均加碘比例为１２．００ｐｐｍ，粉碎粗制加碘盐为１２．６３ｐｐｍ。上半年其生产粉洗精细加碘盐为５０７９．２吨，用ＫＩＯ３１７８．５ｋｇ，平均加碘比例为１８．７５ｐｐｍ，平均碘的损失率１２．３１％；共生产粉碎粗制加碘盐３９７２．００吨，用ＫＩＯ３１３９．４ｋｇ，平均加碘比例为１７．７４ｐｐｍ，平均碘的损失率为１６．０９％。自从１９９０年全国用碘酸钾代替碘化钾以来，盐厂将加碘比例改为以碘酸钾来计，这实际上将原来的加碘比例降低了４０．５％，也是病区病情回升的主要原因。故建议应需维持原来以碘离子计算的加碘比例，改进加碘工艺，降低批间差异，减少碘的丢失。

injiang Uygur Autonomous Region has stipulated that iodine content in iodized salt supplied to north Xinjiang must be 30 ppm.The iodized salt produced by the biggest production base of iodized salt in Xinjiang,Yanhu Chemical Plant,was monitored by the Surveilance Centre of Iodine Deficiency Disorders(IDD)of Xin-jiang,China.The monitoring results showed that mean iodine contents in shattered crude and fine iodized salt were 12.63 and 12.00 ppm,respectively.The outputs of shattered crude and fine iodized salt were 3 972.00and 5 079.20 tons individually with consuming 139.40 and 178.50kg KIO3,one by one during the first half year in 1992;so,the mean iodine contents in crude and fine salt were 17.74 and 18.75 ppm,separately,and the mean loss rates of iodine in crude and fine salt were 16.09%and 12.31%。Since KIO3 replaced KI,and it was used to produce iodized salt all over the country in 1990,the content of iodized salt has been calculated by KIO3 in the Plant.Therefore,if the criteria of iodine concentration used before was calculated by this method,1t was actually lowered by 40.5%,this was also the main cause of going up again of IDD prevalence in endem- ic areas. Hence,we suggested that the calculating standard by I-of iodine content of iodized salt be maintained and that the technological process of iodine addition in iodized salt production be improved to decrease differ- ence between lots of iodized salt and loss of iodine.