Objective To understand the present condition, characteristics and the map of iodine excess areas in Shandong province, which will provide the evidence foradjustment in iodized salt supply in these areas in order to implement the scientific intervention guided by the Regulation.
Methods Across section in one time was adopted for the epidemiological survey based on the east, west, south, north and central in all of townships from 40 counties.2 samples of drinking water from each village were tested for their water iodine content.The data regardingto their recourses and the depth of wells were measured.5 samples ofedible salt were collected from 5 households in each village for quantitative analysis.
Results 2 780 villages in 556 townships of 40 counties were investigated in this study.13 million population were estimated at risk foriodine excess and living in 281 townships of 35 counties where iodine concentration was over 150μg/L in drinding water.The recourses of drinking water were mainly from shallow wells with 3.14±187μg indine/L in mean value or 256μg iodine/L(100-2 304μg/L)in medium.All the iodine excess areas were located in alluvial plain and connected with same iodine excess areas in Hebei, Henan, Jiangsu and Anhui provinces.The etiology of high iodine in shallow well water may be supposed to be iodine aggregation formed by Yellow River in terms of thousands of flood in thousands of years.
Conclusion Iodized salt intervention should be stopped in all townships with the problems of iodine excess accordingto the regulation and startingthe healtheducation project at the same time.Monitoring programme is also important in these areas after stopping iodized salt.It is essential to grasp the great opportunity duringthe National Project entitled" South Water North Transport" so as to change the water recourses.
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