矿泉水中微量元素锶富集的地球化学环境

Geochemical environment of trace element strontium (Sr) enriched in mineral waters

本文通过对全国566处富含锶(Sr)矿泉水的化学测试数据、所处的地球化学环境、地质背景的分析,重点阐述了微量元素Sr的富集与含水介质岩性的关系,并概括了矿泉水中Sr富集的地球化学特征。认为富含Sr矿泉水的形成与不同含水介质岩性和Sr的丰度等地球化学环境密切相关。矿泉水中Sr富集的最有利的环境是碳酸盐岩地层,其次是碎屑岩地层。研究表明,HCO3—Ca型的矿泉水分布最广,但Sr含量普遍偏低。各种重碳酸型的矿泉水中Sr的平均含量均小于1mg L;相反,由于Sr2+和SO2-4呈正相关关系,各种硫酸型的矿泉水中Sr的平均含量大于1mg L。地下水中的pH值能影响Sr的迁移能力,含Sr的矿泉水pH值多集中在7～8 5之间。

Through analysising the test data, geochemistry environment, geological background of 566 mineral water samples which contain strontium (Sr) richly in the whole country, the relation between the enrichment of trace element Sr and the lithology of aquifer medium, and the geochemistry characteristics of Sr enrichment in the mineral water have been presented in the paper. The results have shown that forming of the mineral water which have rich Sr is closely related with such geochemistry environments as different lithology of aquifer medium and abundant degree of Sr etc. The most favorable geological environment which mineral water enrich Sr is carbonate rock, secondly is clastic rock. Studies have shown, it is the widest distributing that the mineral water of the HCO^-_3—Ca type, but Sr concentration is generally on the low side. The average concentration of Sr is less than 1mg/L in various kinds of mineral water which type is the bicarbonate. On the contrary, because Sr^(2+) and SO^(2-)_4 present positive correlation relation, the average concentration of Sr is relatively high (greater than 1mg/L) in various kinds of mineral water which type is the sulfate. pH value in the groundwater can influence the migration ability of Sr and pH value of the mineral water including Sr concentrate on 7～8.5.