卢承龙论文被 Chemical Geology 接收
卢承龙等关于铝土矿赤泥风化过程中矿物相转化驱动溶解性有机质分子分馏的研究被 Chemical Geology 接收。
卢承龙论文 Mineral phase transformation drives molecular fractionation of dissolved organic matter during organic acid-driven weathering of bauxite residue 被 Chemical Geology 接收。
作者： C Lu, S Wu, F You, D Yu, J Vongsvivut, A Klein, L Thomsen, D Parry, TS Chan, L Huang
期刊： Chemical Geology, 2026
Dissolved organic matter (DOM) sequestration is critical to soil formation of bauxite residue (BR), where mineral weathering and neutralization or acidification are driven by microbial- and plant root-derived organic acids. This study used mixed organic acids to simulate mineral weathering during ecological engineering and examined DOM molecular fractionation and adsorption in BR minerals.
Using high-resolution electrospray ionization Orbitrap mass spectrometry, the study characterized selective adsorption and molecular fractionation of DOM derived from microbial decomposition of plant mulch. Organic acid treatments progressively weathered sodalite-like alkaline minerals, formed amorphous Al/Si/Fe phases, lowered pH, and increased reactive surface sites in mineral phases.
The slightly weathered and highly weathered BR minerals preferentially adsorbed high-molecular-weight organics rich in aromatic and/or polyphenolic domains. Synchrotron-based Al, Si, and Fe K-edge X-ray absorption spectroscopy and FTIR mapping further revealed strong associations between secondary Al/Si/Fe phases and protein-, carboxylic-, aromatic-, and oxygenated lipid-like compounds. These findings highlight the role of mineral weathering in controlling DOM stabilization during eco-engineered soil formation of bauxite residue.