摘要
本文研究了冀中地区氟的水文地球化学特征。结果表明,基岩地下水中氟的含量与地下水温度和二氟化碳含量呈正相关趋势,说明除高氟的火山岩地区外,它们是影响地下水中氟含量的主要因素。由于氟与钙能形成难溶化合物氟化钙,因此地下水中钙离子的含量能制约水中氟的增加,只有低钙高钠的地下水才有利于氟离子在水中的富集。最后指出地震孕育过程有可能引起地下水中氟含量的变化,并列举了在某些地震前浅牛_6等井氟出现的可能的前兆变化。
The hydrogeochemical characteristics of Fluorine in central Hebei Province are studied, The results show that there is a positive correlation of Fluorine concentration to temperature and Co_2 concentration in groundwater, so, except for the igneous province with high Fluorine content, temperature and Co_2 concentration are the major factors affecting Fluorine concentration. Inaddition, Ca^(2+) content in groundwater can also influence the F^- concentration due to the low solution of CaF_2, only the groundwater with nigh Na^+/Ca^(2+) ratio favours the enrichment of F^-. Finally, it is pointed out that the preperation process of earthquakes might result in the variation of F^- concentration, and the possible precursors before several earthquakes in Qianniu-6 and other wells are discussed.
出处
《华北地震科学》
北大核心
1991年第2期51-58,共8页
North China Earthquake Sciences
