An analysis on the prevalence of drinking brick-tea type fluorosis in Haibei Prefecture, Qinghai Province in 2018 / 中华地方病学杂志

ABSTRACT

Objective:To study the epidemic status of drinking brick-tea type fluorosis in Haibei Prefecture, Qinghai Province, and to provide evidence for future targeted intervention measures.Methods:In 2018, according to the historical prevalence of drinking brick-tea type fluorosis in Haibei Prefecture, in Haiyan, Menyuan, Qilian, Gangcha counties, based on the classification of pastoral area, agricultural area, semi-agricultural and semi-pastoral areas, one township (town) was selected, and one natural village was selected in each township (town) as a survey site. Drinking water samples of local residents were collected, water fluorine content was detected; and 10 households in Haiyan and Menyuan counties were selected, respectively, 100 brick-tea samples of different brands were collected, brick-tea fluorine content was detected. At the same time, dental fluorosis was examined in all children aged 8 to 12 years old in survey sites; and X-ray of skeletal fluorosis was examined in all adults aged 26 - 55 years old in Haiyan and Menyuan counties, urine samples were collected from adults at random for 1 time and urine fluorine content was detected. Water fluorine, brick-tea fluorine, and urine fluorine contents were detected by ion selective electrode method; the diagnosis of dental fluorosis was based on "Diagnosis of Dental Fluorosis" (WS/T 208-2011), and the diagnosis of skeletal fluorosis was based on "Diagnostic Criteria for Endemic Skeletal Fluorosis" (WS 192-2008).Results:The mean of fluorine of the 10 water samples was 0.33 mg/L (0.20 - 0.84 mg/L). The mean of fluorine of the 100 brick-tea samples was 750 mg/kg (230 - 1 660 mg/kg), and the mean of daily fluorine intake from brick-tea of each person was 1.87 mg. The detection rate of dental fluorosis in children was 22.56% (217/962), and the dental fluorosis index was 0.42. The detection rate of skeletal fluorosis in adults was 6.88% (24/349); and the geometric mean of urine fluorine was 1.53 mg/L (0.20 - 20.60 mg/L).Conclusion:In Haibei Prefecture, residents are still affected by drinking brick-tea type fluorosis, which needs to be paid attention to.