Tracing Fe Sources in Suspended Particulate Matter (SPM) in the Mun River: Application of Fe-Stable Isotopes Based on a Binary Mixing Model,ACS Earth and Space Chemistry

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Tracing Fe Sources in Suspended Particulate Matter (SPM) in the Mun River: Application of Fe-Stable Isotopes Based on a Binary Mixing Model
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-06-04 , DOI: 10.1021/acsearthspacechem.1c00097
Kunhua Yang ₁ , Guilin Han ₁ , Jie Zeng ₁ , Man Liu ₁ , Xiaoqiang Li ₁ , Ye Zhao ₂

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The Fe isotopic composition of the riverine suspended particulate matter (SPM) in the Mun River was found to improve the knowledge of the Fe isotope behaviors in the surface environment. The δ⁵⁶Fe varies from −0.25 to 0.29‰ with an average value of 0.02‰. Most Fe (on average 76.1%) exists in suspended phases rather than dissolved phases in the Mun River, highlighting the significance of investigating the Fe isotopic compositions of riverine SPM. The close relationship between the chemical index of alteration (CIA) value and the δ⁵⁶Fe value (r = 0.56, P < 0.01), as well as the increasing trend of the δ⁵⁶Fe value along the weathering trend line (A–CN–K diagram), confirm that the types and intensities of weathering are essential for regulating Fe isotopic fractionation. Evidence from the high enrichment factor (EF, 0.62–3.97) and the significant correlation between (Fe/Al)_SPM and (Zn/Al)_SPM indicate the important role of the anthropogenic Fe contribution. To decipher the origin of Fe in SPM, the natural and anthropogenic end-members were investigated further. The Fe contents display a clear correlation with Na, Mg, Al, K, and rare earth elements (REE), indicating that clay and heavy minerals are important containers for riverine particulate Fe. A binary mixing model was adopted and the results showed that the relative anthropogenic Fe contribution varies from 5.79 to 97.70% (average 48.46%) for most SPM (excluding high-Mn samples). The spatial distribution characteristics of relative anthropogenic contribution suggest agricultural activities as a likely source of anthropogenic particulate Fe in SPM.

中文翻译：

追踪门河悬浮颗粒物 (SPM) 中的铁源：基于二元混合模型的铁稳定同位素应用

发现门河中河流悬浮颗粒物 (SPM) 的 Fe 同位素组成可以提高对地表环境中 Fe 同位素行为的了解。δ ⁵⁶ Fe的变化范围为-0.25～0.29‰，平均值为0.02‰。大多数 Fe（平均 76.1%）存在于 Mun 河中的悬浮相中，而不是溶解相，突出了研究河流 SPM 中 Fe 同位素组成的重要性。化学蚀变指数（CIA）值与δ ⁵⁶ Fe 值的密切关系（r = 0.56, P < 0.01），以及δ ⁵⁶的增加趋势沿风化趋势线（A-CN-K 图）的 Fe 值证实了风化的类型和强度对于调节 Fe 同位素分馏至关重要。来自高富集因子 (EF, 0.62–3.97) 的证据以及 (Fe/Al) _SPM和 (Zn/Al) _SPM之间的显着相关性表明人为 Fe 贡献的重要作用。为了破译 SPM 中 Fe 的起源，进一步研究了自然和人为末端成员。Fe 含量与 Na、Mg、Al、K 和稀土元素 (REE) 显示出明显的相关性，表明粘土和重矿物是河流颗粒 Fe 的重要容器。采用二元混合模型，结果表明，对于大多数 SPM（不包括高锰样品），人为 Fe 的相对贡献从 5.79% 到 97.70%（平均 48.46%）不等。相对人为贡献的空间分布特征表明农业活动是 SPM 中人为颗粒 Fe 的可能来源。

更新日期：2021-06-17

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