Exploring the Affinity and Selectivity of Sedimentary Mackinawite (FeS) Towards Natural Organic Matter

This study aimed at studying the interactions between iron sulfides and organic carbon in hypoxic to anoxic sediments, focusing on St. Lawrence Estuary. The data provided here discussed the concentration profiles of different species in sediments pore waters sampled from different stations of St. Lawrence Estuary and Gulf. The capacity of synthetic iron sulfide toward sorption, here refers to adsorption and coprecipitation processes, was assessed through analyzing the thermodynamic isotherms after reaching the equilibrium in the presence of different concentrations of organic matter. The organic matter used in this study were extracted from different natural aquatic and terrestrial sources including plankton, corn, and soil .The effect of the organic matter sorption on the iron sulfide morphology was investigated through scanning electron microscopy. The colocalization between organic matter and iron sulfide was studied via synchrotron scanning transmission X-ray microscopy (STXM) coupled to near-edge X-ray absorption fine-edge structure (NEXAFS) spectroscopy revealed strong interactions between Fe-S minerals and NOM, specifically NOM extracted from plankton.

本研究旨在探究缺氧至厌氧沉积物中铁硫化物与有机碳之间的相互作用，聚焦于圣劳伦斯湾。所提供数据探讨了从圣劳伦斯湾及海湾不同站位采集的沉积物孔隙水中不同物种的浓度分布。本研究评估了合成铁硫化物对吸附和共沉淀过程的亲和力，即吸附亲和力，通过分析有机物不同浓度下达到平衡状态后的热力学等温线进行。所使用的有机物源自不同天然水生和陆地来源，包括浮游生物、玉米和土壤。通过扫描电子显微镜研究了有机物吸附对铁硫化物形态的影响。利用同步辐射扫描透射X射线显微镜（STXM）结合近边缘X射线吸收精细结构（NEXAFS）光谱学，研究了有机物与铁硫化物之间的共定位，揭示了Fe-S矿物与天然有机物（NOM）之间，特别是浮游生物提取的NOM之间的强烈相互作用。