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| Spatial distribution of iodine in drinking water in Wenzhou |
| GAO Si-hai, ZHANG He-mei, LIN Dan, WANG Li-li, CAI Yuan-yuan
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| Wenzhou Center for Disease Control, Prevention, Wenzhou, Zhejiang325001, China |
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Abstract Objective To understand the spatial distribution of iodine in drinking water in Wenzhou,and to provide reference for preventing iodine deficiency disorders. Methods Drinking water was sampled from 182 townships of all 11 counties under the jurisdiction of Wenzhou according to different ways of water supply. The iodine in water was detected by cerium sulfate catalytic spectrophotometry. The water iodine data was matched with the electronic map by ArcGIS10.2 to construct a spatial database; spatial autocorrelation analysis by GeoDa1.10 and spatial scanning analysis by SaTScan 9.4 were conducted to obtain the water iodine concentration range in Wenzhou. Results The contents of iodine in 998 out of 1 008 drinking water samples were less than 10 μg/L,accounting for 99.01%. The median of water iodine in all townships of Wenzhou was 1.8 μg/L. The results of geospatial distribution analysis demonstrated that the iodine distribution in drinking water had positive spatial autocorrelation in Wenzhou（Moran's I= 0.40,Z=15.65,P< 0.05）; there were four kinds of local aggregation models for water iodine in 78 townships（P< 0.01）. Three cluster areas of the water iodine were detected by space scanning,with three townships in Dongtou as the first high cluster areas,seven coastal townships in Cangnan as the second high cluster areas and 49 mountainous townships in Yongjia,Yueqing and Lucheng as the low cluster areas. Conclusion The iodine in drinking water in Wenzhou was low and exists spatial aggregation.
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Received: 14 January 2019
Revised: 03 April 2019
Published: 03 June 2019
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