| 藏东多曲河流域锶富集水化学特征及控制因素 |
| 摘要点击 2264 全文点击 91 投稿时间：2023-05-26 修订日期：2023-06-30 |
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| 中文关键词 多曲河 Sr富集 水化学特征 离子来源 风化溶解 人类活动 |
| 英文关键词 Duoqu River Sr enrichment hydrochemistry characteristics ion source weathering dissolution human activities |
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| 中文摘要 |
| 分析高原河流地表水中锶（Sr）富集的水化学特征及其影响因素,有助于指导水资源的合理开发利用和生态环境保护.以金沙江多曲河流域地表水为例,采集地表水样品23组,综合利用相关分析、主成分分析、Gibbs模型和离子比等方法,分析该区地表水中Sr2+富集的水化学特征及控制因素,识别主要离子的物质来源.结果表明,多曲河流域地表水阳离子主要以Ca2+和Mg2+为主,阴离子以HCO3-为主.该流域水化学类型以HCO3-Ca型为主,其次为HCO3-Ca·Mg型.主成分分析揭示了影响多曲河水质演化的3个主成分因子,碳酸盐岩风化溶解是控制多曲河水化学组成的主要因素.ρ（Sr2+）超过0.40 mg·L-1的富Sr水点占样品总量的30.43%.区内分布的闪长岩及花岗岩为多曲河流域Sr2+富集提供了物质基础.Sr2+与Ca2+相关性较高,二者存在伴生和共同富集现象.地表水在发生一定的反向离子交换作用Sr2+从围岩中的释出是水体中Sr2+富集的来源之一.工矿活动辰砂矿物的开采是造成附近地表水点SO42-升高的主要因素,同时也促进了Sr2+在水环境中的富集.受控于岩石风化作用、人类活动及工矿活动的综合影响,沿程Sr2+质量浓度整体上呈现增加趋势. |
| 英文摘要 |
| The analysis of hydrochemical characteristics and influencing factors of strontium （Sr） enrichment in surface water of plateau rivers is helpful for guiding the rational development and utilization of water resources and ecological environment protection. In this study, surface water in the Duoqu Basin of Jinsha River located in Eastern Tibet was selected as the representative case. Twenty-three groups of surface water samples were collected to analyze the hydrochemical characteristics and control factors of Sr2+ enrichment based on correlation analysis, principal component analysis, a Piper trigram, and the Gibbs model. The results showed that the cations in the Duoqu River Basin were mainly Ca2+ and Mg2+, and the anions were mainly HCO3-. The hydrochemical type of this basin was mainly HCO3-Ca, followed by HCO3-Ca·Mg. Principal component analysis revealed three principal component factors affecting the evolution of water quality in the Duoqu River, with weathering and dissolution of carbonate rocks being the main factors controlling the chemical composition of the Duoqu River. The water points with Sr2+ mass concentration over 0.40 mg·L-1 accounted for 30.43%. Diorite and granite distributed in this area provided a material basis for Sr2+ enrichment in the surface water. Sr2+ and Ca2+ had a high correlation, and they were associated and co-enriched. The release of Sr2+ from surrounding rock was one of the sources of Sr2+ enrichment in the surface water during certain reverse ion exchanges. Mining of cinnabar minerals was the main factor causing the increase in SO42- in nearby surface water points, which also promoted the enrichment of Sr2+ in the water environment. Controlled by the comprehensive impact of rock mineral weathering, human activities, and industrial and mining activities, Sr2+ mass concentration showed an overall increasing trend along the river. |
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