Molecular insight into biomass-burning smoke water-soluble organic matter binding with Cd(II): Comprehensive analysis from fluorescence EEM-PARAFAC, FT-ICR-MS and two-dimensional correlation spectroscopy,Journal of Hazardous Materials

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Molecular insight into biomass-burning smoke water-soluble organic matter binding with Cd(II): Comprehensive analysis from fluorescence EEM-PARAFAC, FT-ICR-MS and two-dimensional correlation spectroscopy
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-04 , DOI: 10.1016/j.jhazmat.2024.135754
Weifeng Chen ₁ , Yue Cheng ₁ , Huiying Zhang ₁ , Usman Farooq ₂ , Jinzhi Ni ₁ , Hui Chen ₁ , Youtao Si ₁ , Zhichong Qi ₂

Affiliation

The deposition of biomass-burning smoke water-soluble organic matter (BBS-WSOM) significantly affects the environmental behavior of heavy metals in aqueous environments. However, the interactions between BBS-WSOM and heavy metals at the molecular level remain unknown. This study combined FT-ICR-MS, fluorescence spectrum, FTIR, and two-dimensional correlation spectroscopy to anatomize the molecular characteristics of BBS-WSOM binding with Cd(II). The results show that CHO and CHOP compounds were responsible for the fluorescence response of BBS-WSOM at Ex: 225 nm and 275 nm/Em: 325 nm, and abundant proteins or CHON compounds were responsible for the fluorescence response of BBS-WSOM at Ex: 225–250 nm/Em: 350–450 nm and Ex: 300–350 nm/Em: 350–450 nm, which was very different from the fluorescence molecules in natural organic matters. Fluorescence change after Cd(II) addition indicated that CHOP and CHOS compounds enhanced BBS-WSOM binding with Cd(II). Differently, the CHON compounds could weaken the binding of other compounds with Cd(II). Different compounds binding with Cd(II) generally followed the order: CHON/CHOS compounds>CHOP compounds>CHO compounds, and the chemical groups binding with Cd(II) generally followed the prioritization: -COO-> -NH/SO>P = O/P-O>aromatic ring>CO>C-OH of phenol/alcohol>C-O-C. This study provides a profound insight into the interaction between BBS-WSOM and Cd(II) at the molecular level.

中文翻译：

生物质燃烧烟气水溶性有机物与 Cd（II）结合的分子洞察：从荧光 EEM-PARAFAC、FT-ICR-MS 和二维相关光谱进行综合分析

生物质燃烧烟水溶性有机物（BBS-WSOM）的沉积显著影响水环境中重金属的环境行为。然而，BBS-WSOM 与重金属在分子水平上的相互作用仍然未知。本研究结合 FT-ICR-MS 、荧光光谱、FTIR 和二维相关光谱，剖析了 BBS-WSOM 与 Cd（II）结合的分子特征。结果表明，CHO 和 CHOP 化合物负责 BBS-WSOM 在 Ex：225 nm 和 275 nm/Em：325 nm 处的荧光响应，丰富的蛋白质或 CHON 化合物负责 BBS-WSOM 在 Ex：225–250 nm/Em：350–450 nm 和 Ex：300–350 nm/Em：350–450 nm 处的荧光响应，这与天然有机物中的荧光分子有很大不同。添加 Cd（II）后的荧光变化表明 CHOP 和 CHOS 化合物增强了 BBS-WSOM 与 Cd（II）的结合。不同的是，CHON 化合物可以削弱其他化合物与 Cd（II）的结合。与 Cd（II）结合的不同化合物通常遵循以下顺序：CHON/CHOS 化合物>CHOP 化合物>CHO 化合物，与 Cd（II）结合的化学基团通常遵循优先顺序：-COO-> -NH/SO>P = O/P-O%3烯芳环>CO>C-OH 的酚/醇>C-O-C。这项研究在分子水平上为 BBS-WSOM 和 Cd（II）之间的相互作用提供了深刻的见解。

更新日期：2024-09-04

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