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Behaviour of Cr in runoff from two catchments underlain by felsic bedrock
Hydrological Sciences Journal ( IF 2.8 ) Pub Date : 2020-11-18 , DOI: 10.1080/02626667.2020.1836373
A. V. Andronikov 1 , M. Novak 1 , P. Kram 1 , O. Sebek 1 , I. E. Andronikova 1 , N. A. Efremenko 2 , G. S. Borodulina 2 , D. A. Subetto 2, 3 , M. Stepanova 1 , E. Antalova 1 , M. A. Levichev 2 , M. V. Zobkova 2 , G. L. Chesalina 2
Affiliation  

ABSTRACT Chromium isotope and chemical compositions in runoff from two felsic rock catchments, the Lysina (LYS; Czech Republic) and the Neglinka (NEG; northwest Russia), were studied. Three types of water were identified: Na-Ca-SO4 type for the LYS, Mg-Ca-Cl-HCO3 type for the NEG downstream, and Mg-Ca-Cl to Mg-Ca-HCO3 type for the NEG upstream. The Cr (III) liberated during soil/bedrock weathering oxidized to Cr (VI), which was the main dissolved Cr species in both catchments. Variations in δ53Cr values for LYS runoff (–0.07‰ to +0.37‰) reflected a sole Cr source, seasonality of weathering and hydrologically controlled leaching/export processes. In the NEG catchment, back-reduction of Cr (VI) to Cr (III) during riverine transport resulted in a decrease in Cr concentrations (to 10–30%) and in an increase of δ53Cr values (+0.09 to +0.42‰ for the upstream to +0.72 to +1.73‰ for the downstream). Groundwater discharge could have influenced the chemical composition of the downstream NEG runoff to some extent.

中文翻译:

长英质基岩下两个集水区径流中Cr的行为

摘要 研究了来自两个长英质岩石集水区 Lysina(LYS;捷克共和国)和 Neglinka(NEG;俄罗斯西北部)的径流中的铬同位素和化学成分。确定了三种类型的水:用于 LYS 的 Na-Ca-SO4 类型,用于 NEG 下游的 Mg-Ca-Cl-HCO3 类型,以及用于 NEG 上游的 Mg-Ca-Cl 到 Mg-Ca-HCO3 类型。土壤/基岩风化过程中释放的 Cr (III) 被氧化成 Cr (VI),这是两个流域中主要溶解的 Cr 物质。LYS 径流的 δ53Cr 值的变化(–0.07‰ 到 +0.37‰)反映了唯一的 Cr 来源、风化的季节性和水文控制的浸出/出口过程。在 NEG 流域,河流运输过程中 Cr (VI) 向 Cr (III) 的逆还原导致 Cr 浓度降低(至 10-30%)和 δ53Cr 值增加(+0.09 至 +0.09)。上游为 42‰,下游为 +0.72 到 +1.73‰)。地下水排放可能在一定程度上影响了下游 NEG 径流的化学成分。
更新日期:2020-11-18
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