硫酸侵蚀碳酸盐岩对长江河水DIC循环的影响

被引：50

作者：

李军 ^{[1
,2
]}

刘丛强 ^{[2
]}

李龙波 ^{[2
]}

李思亮 ^{[2
]}

王宝利 ^{[2
]}

BCHETELAT ^{[2
]}

机构：

[1] 天津师范大学水环境与水资源重点实验室

[2] 中国科学院地球化学研究所环境地球化学国家重点实验室

来源：

地球化学 | 2010年 / 39卷 / 04期

关键词：

水化学; 溶解无机碳; 碳同位素; 硫酸侵蚀; 长江;

D O I：

10.19700/j.0379-1726.2010.04.002

中图分类号：

P588.245 [];

学科分类号：

摘要：

对长江及其主要支流河水水化学和溶解无机碳(DIC)同位素组成(δ13CDIC)进行了研究。河水阳离子组成以Ca2+、Mg2+为主,阴离子以HCO 3-、SO42-为主,水化学组成主要受流域碳酸盐岩矿物的化学侵蚀控制。DIC含量为0.3～2.5 mmol/L,从上游到河口逐渐降低。δ13CDIC值为-12.0‰～-3.4‰,与DIC含量具有相似的变化趋势。H2CO3溶解碳酸盐岩是控制河水DIC来源及其δ13CDIC组成的主要机制。H2SO4溶解碳酸盐岩加剧了流域碳酸盐岩的化学侵蚀,一方面导致了河水的DIC含量增加,另一方面也使河水的δ13CDIC值升高。

引用

页码：305 / 313

页数：9

共 21 条

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