Investigation on present situation of endemic fluorosis after improving cooking stove in rural area of Zhejiang province

  Objective   To know the developed situation of endemic fluorine poison after improving cooking stove, counter measurements and strategy can be made.

  Methods   According to the prior project, individuals in Fangcun village, Jiehu village were randomly selected as samples to investig ate the situation of fluorosis and fluorine content in outer environment in Fang cun tow nship of Changshan county.

  Results   The fluoine content of residential drinking water, for most jar water(dated), was (0.715±0.697)mg/L, higher than that of raw water(well)which was(0.483±0.206)mg/L(t=3.16, P < 0.01)As for indoor air fluor ine content in residential house was above 0.02 mg/m³.Coal fuel stove fluorine(0.051 8±0.037 4)mg/m³, higher than that of non coal fuel stove of(0.013 6±0.008 3)mg/m³(t=3.082, P < 0.01).Child urine fluorine content liv ing in coal fuel family(0.638±0.415 mg/L)was higher than that of living in non coal fuel family(0.304±0.285)mg/L(t=2.895, P < 0.01).Children of 8-12 yeas old had 7.43% with dental fluorosis.

  Conclusion   On site endemic fluorosis was controlled.Compared with the result of 1990, children dental fluorosis rate decreased obviously, but supervision was still needed.fluorosis prevention and monitoring should be continuously carried out.