Analysis on the survey results of iodine content in drinking water in Fuzhou, 2017 / 中华地方病学杂志

ABSTRACT

Objective:To understand the level and distribution of iodine contents in drinking water in Fuzhou City so as to provide evidence for prevention of iodine deficiency disorders and health intervention.Methods:In 2017, a township-level water iodine survey was carried out in 12 counties (cities, districts) under the jurisdiction of Fuzhou City, with a township as a unit, and carry out administrative village-level water iodine survey in township with the median water iodine ≥ 10 μg/L. The water samples of residents' drinking water were collected according to different water supply methods (centralized water supply, mixed water supply and decentralized water supply), and the water iodine content was determined. The water iodine content less than 10 μg/L means iodine deficiency in the external environment. The iodine contents in drinking water of residents in different areas, different water supply methods and different water source types were compared and analyzed.Results:A total of 172 townships in 12 counties (cities, districts) were investigated for water iodine, and 1 630 water samples were collected and tested, the median water iodine was 2.8 μg/L and the range was 0.0 - 130.3 μg/L. At the township-level, the median range of water iodine was 0.4 - 11.2 μg/L. A total of 75 administrative villages were investigated in 4 townships with a median water iodine ≥ 10 μg/L, the median water iodine range was 0.5 - 19.8 μg/L. At the counties (cities, districts) level, the medians of water iodine were all less than 10 μg/L. Among them, the medians of water iodine in inland areas and coastal areas were 2.0 and 4.0 μg/L, respectively, and the difference between different areas was statistically significant ( Z = - 15.70, P <0.01). The medians of water iodine for centralized water supply, mixed water supply and decentralized water supply were 4.1, 2.7, and 3.4 μg/L, respectively, and the difference between different water supply methods was statistically significant ( H = 19.38, P < 0.01). The medians of water iodine in surface water and well water were 2.4 and 3.1 μg/L, respectively, the difference between different water source types was statistically significant ( Z = - 6.23, P<0.01). Conclusions:Iodine deficiency of external environment is common in Fuzhou City, and there is no distribution of high iodine in water source. It is necessary to strengthen the monitoring of iodine deficiency disorders, establish a long-term working mechanism suitable for the level of economic and social development, and consolidate the achievements of prevention and control.