云南鹤庆西山岩溶地下水主要离子雨季和旱季对比及来源分析

鹤庆西山岩溶地下水是当地居民的主要生活用水来源,本文综合运用统计学分析方法对地下水主离子的雨季和旱季变化特征及其来源进行了研究。结果表明,研究区岩溶地下水主要补给来源为大气降水,TDS介于113.3~180.76mg/L属弱矿化度水,总硬度(Ca2++Mg2+)介于38~53 mg/L之间属于极软水。HCO-3和(Ca2++Mg2+)分别占主要阴阳离子的79.6%~95.5%和75%~94%,按照O.A.阿列金分类法研究区水质为HCO3-Ca·Mg型水。Ca2+、Mg2+、Cl-、SO2-4及HCO-3均未出现季节性变化,Na+与NO-3为丰水期枯水期,K+出现异常为丰水期枯水期。参照我国及世界卫生组织饮用水标准,锰矿黑龙潭泉受人为活动的影响较大,不宜长期饮用;其他地区主要离子浓度不会对人体产生危害。

Major Ion Chemistry and Their Sources of Karstic Ground Water from the Heqing West Mountain, China during Flood and Dry Seasons

The Heqing west Mountain''s karstic ground water is the main domestic water source for local residents. In this paper, statistical analysis methods were performed to explore their origins and variations during flood and dry seasons. Results show that atmospheric precipitation is the major source in the study area, the water is HCO₃-Ca·Mg type with low mineralized degree, and its total dissolved solid rangs 113.30~180.76 mg/L, with total hardness(Ca²⁺+Mg²⁺) ranging 38~53 mg/L, indicating very soft water. HCO₃^- accounts for 79.6%~95.5% of the total major anions, while Ca²⁺and Mg²⁺ account for 75%~94% of the total major cations. Statistical analyses indicate that none of the concentrations of Ca²⁺, Mg²⁺, Cl^-, SO₄^2- nor HCO₃^- show significant seasonal differences; the concentrations of Na⁺ and NO₃^- in flood season are relatively lower than those in dry season, while K⁺ shows abnormal trend to have a lower concentration in dry season. According to water drinking quality guidelines of China and WHO, the spring at the manganese ore "Hei-long" pool was largely affected by human activities and it''s unfit for long-term drinking; major ions in other springs of our study area have no adverse effects on human.