云南白水台钙华景区水的物理化学动态变化研究

STUDY ON THE PHYSICAL AND CHEMICAL VARIATIONS OF THE WATER IN BAISHUITAI TUFA SCENIC AREA OF YUNNAN

本文采用水化学仪器自动记录、现场测定和取样室内分析等相结合的方法,对云南白水台钙华景区水的物理化学动态变化特征进行了综合研究,结果发现:随着CaCO3的沉积,水中的主要离子Ca2+和HCO-3浓度、电导逐渐降低;pH值升高。我们对1号泉进行昼夜观测发现:5月1号泉的水温呈周期性变化,周期约为28小时,而在9月水温保持恒定。对下游(12号观测点)的动态观测发现水的pH值与水温呈反相关关系,在对中游(6号观测点)的早、中、晚观测得到了同样的结果。最终我们得出结论:1号泉水温变化可能受补给水源水温动态变化、降雨和地热影响;中下游pH值和电导率的变化与碳酸钙的沉积速率、碳酸平衡和藻类作用有关。

A method of combining hydrochemical data logging and in situ observation with measurements of samples is used to study the physical and chemical variations of the water in the Baishuitai tufa scenic area. It is found that the concentration of Ca2+ and HCO-3, and specific conductivity gradually decrease with CaCO3 precipitation, but pH value increases. After observing for 48 hours and 24 hours in Spring 1 and water at lower reaches (site No.12), it is found that the temperature of Spring 1 recurrences in 28 hours in May while it is invariable in September. It is also found that the pH value is related to water temperature at lower reaches (site No.12), so is that at middle reaches (site No.6). Therefore it is concluded that the temperature of Spring 1 may be influenced by the temperature of the recharge water, rainfall and that of the geothermal; the changes of pH value of middle reaches and lower reaches is related to the precipitation rates of calcium carbonate, the equilibrium of carbonic acid and biologic process.