Analysis of the surveillance results of drinking-water-born endemic fluorosis in Etuoke Banner of Inner Mongolia in 2015 / 中华地方病学杂志

ABSTRACT

Objective To understand the status of the disease in local population and the fluoride content in drinking water in the endemic areas of endemic fluorosis in Etuoke Banner of Inner Mongolia,and to provide a scientific basis for making strategies in prevention and control of the disease.Methods Totally 100 endemic fluorosis villages were selected as survey sites,to study the progress and effect of water-improving and defluoridation projects in Etuoke Banner in 2015.In monitoring villages with improved water,1 water sample from the tap water was collected to determine the fluoride level,and in water unimproved villages,1 water sample from each direction of the east,south,west,north and middle of the villages was collected,respectively,to determine fluoride level.Dental fluorosis of children aged 8 to 12 was examined in each village.Water fluoride was tested according to the Standard Testing Methods for Drinking Water (GB/T 5750.5-2006).Diagnosis of dental fluorosis was based on the Diagnostic Criteria for Dental Fluorosis (WS/T 208-2011).Results A total of 100 diseased villages were investigate,the water-improving rate was 39.00％ (39/100).Among the 39 water-improving projects,normal operating rate was 66.67％ (26/39),intermittent operating rate was 15.38％ (6/39) and scrapped projects accounted for 17.95％ (7/39);the qualified rate of water fluoride projects was 53.85％ (21/39).A total of 268 tap water samples were collected,the mean of water fluoride was 1.39 mg/L,and the range was 0.22-5.57 mg/L.In the 61 waterunimproved villages,the water fluoride level ＞ 1.2 mg/L in the drinking water accounted for 49.18％ (30/61),covering a population of 5 231 people.The water fluoride level ＞ 2.0-4.0 mg/L in the drinking water accounted for 18.03％ (11/61),covering a population of 2 326 people;the number of village with water fluoride level ＞ 4.0 mg/L was 1,accounted for 1.64％ (1/61),covering a population of 162 people.A total of 1 040 children aged 8 to 12 in the survey villages were examined,the total rate of dental fluorosis was 9.71％ (101/1 040),the index of dental fluorosis was 0.18,and the prevalence was negative.Conclusion The water-improving and defluoridation projects in Etuoke Banner,Inner Mongolia has a certain effect on children's dental fluorosis,but water fluoride content has exceeded the standard significantly,the water improvement measures should be further strengthened.