Study on iodine nutrition status among population in different areas of water iodine and measures of iodine supplement in salt

Objective Understand people's nutrition status of iodine in the different areas of water iodine,iodine salt,edible salt,in order to provide the basis for science.Methods Each township(town) on east,west,south,north,in different directions randomly selected five villages,each village based on the number of water sources of drinking water taken from 1 to 5 samples were measured iodine content of water;different areas of water iodine(water iodine value 10 μg/L,10~μg/L,20~μg/L,75~μg/L,150~μg/L,300~μg/L,600~μg/L) were randomly selected 3 to 5 townships,200 or more(men and women female) children aged 8 to 10 for urinary iodine content measurement,then each township 40 salt samples in families with children to determine iodine content of salt;in towns water iodine value below 150 μg/L,randomly selected 20 women of childbearing age for urine iodine determ in ation;water iodine and urine iodine concentration were detected by arsenic Ce catalytic spectrophotometry,salt iodine content was determined by direct titration. Results 919 water samples were monitored in 190 townships(towns),iodine content was 0.15~2 840.4 μg/L,the water iodine 66.38 μg/L.In areas water iodine value 10 μg/L,10~μg/L,20~μg/L,75~μg/L,150~μg/L,300~μg/L,600~μg/L,the median of urinary iodine in children and that of household iodized salt were 174.38 μg/L,25.41 mg/kg;145.22 μg/L,7.45 mg/kg;229.58 μg/L,16.50 mg/kg;197.44 μg/L,4.45 mg/kg;257.26 μg/L,8.21 mg/kg;388.40 μg/L,3.83 mg/kg;1 506.30 μg/L,0 mg/kg;in areas water iodine value 10 μg/L,10~μg/L,20~μg/L,75~μg/L,urinary median iodine in women of childbearing age were 139.61 μg/L,131.22 μg/L,225.53 μg/L,192.42 μg/L. Conclusions In non-iodine areas,iodized salt was an important factor for iodine nutrition,the concentration of salt iodine content in drinking water should be based on the different iodine in water.In areas water iodine 20μg/L,salt iodine concentration of 20~30 mg/kg was appropriate;In areas water iodine between 20 and 150 μg/L,salt iodine concentration of 10~20 mg/kg was appropriate.Iodized salt in high iodine areas should be stopped and reduced iodine by changing water.