摘要
目的 探讨影响改水降氟工程水氟含量的因素。方法 采取整群抽样办法 ,对被调查县 1996年之前的所有打井工程水氟含量、打井深度、井壁结构材料和井周封闭土质进行逐项调查。结果 1井深在≤ 40 ,41～5 9,6 0～ 79,80～ 99m和≥ 10 0 m改水降氟工程合格率分别为 71.2 4% ,81.2 5 % ,83.32 % ,90 .85 %和 94.2 3%。 2井深在 80 m以上的钢管井壁结构工程水氟合格率明显高于水泥管井壁结构工程水氟合格率 ,差异有非常显著意义。3在井深 5 9m以内 ,虽呈现粘土密封工程水氟合格率高于砂土密封工程 ,但差异无显著意义 ;井深 6 0 m以上工程水氟含量合格率粘土封闭工程显著高于砂土封闭工程。结论 1改水降氟工程水氟合格率伴随打井的深度增加而增高 ,二者呈现高度正相关关系。 2改水降氟工程在打深水井的基础上 ,使用钢管井壁材料并用粘土密封井周 。
Objective To study the influential factor on fluoride concentration of fluoride-lowering projects.Methods Surveying the fluoride concentration,well depth,wall material and the surrounding earth.Results ①The qualified rate of projects at depth of ≤40,41~59,60~79,80~99 m and ≥100 m is 71.24%,81.25%, 83.32%,90.85% and 94.23%,respectively.②The qualified rate of wells with steel wall is significantly higher than that with cement wall at well depth above 80 m.③The qualified rate of water fluoride concentration of projects sealed by sticky earth is higher than those by sandy earth at well depth below 59 m,however there is no statistic difference.The qulified rate of wells sealed by sticky earth is significntly higher than that of those sealed by sandy earth at well depth above 60 m.Conclusions ①The qualified rate increases with the well depth increase,and there are highly positive correlation between them (r=0.9791,P<0.01).②The penetration of high-fluoride water and the rise of water fluoride concentration can be prevented efficiently by using steel pipe,and sealing well by sticky earth.
出处
《中国地方病学杂志》
CAS
CSCD
北大核心
2001年第5期360-361,共2页
Chinese Jouranl of Endemiology
关键词
水氟
井深
合格率
井壁
改水降氟
深水井
Fluoride concentration
Well depth
Qualified rate
Well wall
