冻融条件下溶解性有机物在冰-水-沉积物体系中的迁移

通过设置室内控制实验，测定冻融过程中冰水两相的三维荧光光谱（EEMs）、SUVA254、TN、TP、DOC，并对三维荧光特征指数、SUVA254、TN、TP、DOC进行相关性分析。结果表明，冻结过程中水相的三维荧光光谱中类色氨酸峰A、类酪氨酸峰B、类腐殖酸峰C的荧光强度增强，TN、TP质量浓度增加至原水样的1.47、1.13倍。说明在冻结过程中由于冷冻浓缩效应，类色氨酸、类酪氨酸、类腐殖酸三类溶解性有机物、TN、TP由冰相向水相迁移。随着冰相体积的增加，三类溶解性有机物、TN、TP向沉积物迁移，并在溶解过程中，由沉积物向水体释放。通过测定冻融条件下冰水两相中BPA、E2、EE2的质量浓度发现，在冻结过程中BPA、E2、EE2向水相中迁移，结合相关性分析结果说明芳香族物质更易向水相中迁移。

Migration of dissolved organic matter in an ice-water-sediment system under freeze-thaw alternating conditions

Controlled indoor experiments were conducted to measure the excitation emission matrix spectroscopy (EEMs), SUVA₂₅₄, TN, TP and DOC of both ice and water samples during the freeze-thaw process. The results showed an increase in the fluorescence intensity of tryptophan-like peak A, tyrosine-like peak B, and humic acid-like peak C in the aqueous phase during freezing. Additionally, the concentrations of TN and TP increased to 1.47 and 1.13 times the original water sample levels, indicating the migration of tryptophan-like, tyrosine-like and humic acid-like dissolved organic compounds, TN and TP from the ice phase to the aqueous phase due to the freeze concentration effect. As the volume of ice expanded, these substances migrated into the sediment and were released from the sediment into the water during the dissolution process. Correlation analysis results further showed that aromatic substances were more likely to migrate into the aqueous phase during freezing.