Regional distribution of iodine excess in drinking water and its epidemiology in Jinan

ObjectiveTo master the present conditions of iodine excess and its epidemiology in Jinan city,for providing the evidence for control.MethodA cross section was adopted for the epidemiological survey in all of townships from 2 counties.Two samples of drinking water from each village were tested for wateriodine content as well as the data regarding to their resourses and the depth of wells.Five samples of edible salt were collected for quantitative analysis at each village.ResultsTwenty-nine townships were investigated.Three hundred and seventy six samples of drinking water were tested,in which values of iodine content were(112.1±91.3)μg/L in mean,90.3 μg/L(0.5-605.2 μg/L)in median.The rate of iodized salt is 90.2%.About twenty thousand people were at risk foriodine excess arid living in 7 tow nships where iodine concentration was over 150 μg/L in drinking water.All of them were mainly located in alluvial plain of Yellow river.There was positive relationship between content of iodine water and its depth of well.The medium of urinary iodine in 725 inhabitants from 29 townships were 327.0 μg/L(35.6-2938.5 μg/L).Thyroid goiter rate(TGR)of 725 subjects was 4.8%.ConclusionThere were 7 areas with iodine excess in drinking waterin Jinan.TGR was in normal range,but the nutrition level of iodine was ex cess in inhabitants.It was sugg ested that iodized salt supply should be stopped in 7 townships and taking different strategies against iodine deficiency orio dine excess in the city.