Wang Yiting, Deng Qingxin, Wang Yiqun, Li Pan, Jin Biao, Liu Jiangping, Cheng Peng, Brigante Marcello, D'Antuono Dario, Carena Luca, Chen Hui, Vione Davide, Gligorovski Sasho
Key Laboratory of Organic Compound Pollution Control Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
State Key Laboratory of Organic Geochemistry and Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
Sci Rep. 2024 Dec 30;14(1):31802. doi: 10.1038/s41598-024-82865-y.
Bisphenol A (BPA, 4,4'-(propane-2,2-diyl)diphenol) is a common plasticizer that is very widespread in the environment and is also found at significant concentrations in the global oceans, due to contamination by plastics. Here we show that triplet sensitization is an important degradation pathway for BPA in natural surface waters, which could prevail if the water dissolved organic carbon is above 2-3 mg L. Bromide levels as per seawater conditions have the potential to slow down BPA photodegradation, a phenomenon that could not be offset by reaction of BPA with Br (second-order reaction rate constant of (2.54 ± 0.09) × 10 M s). Ultra-high resolution mass spectrometry revealed that the presence of inorganic salts (NaCl and NaBr) markedly increased the complexity of the observed CHO product compounds formed upon photosensitized degradation of BPA. The obtained results suggest that bisphenols can be efficiently removed by photosensitized reactions and generate higher number of oligomers and polyaromatic compounds in the sea surface and liquid water of marine aerosols compared to freshwaters and/or dilute cloud-water. Considering that polyaromatic compounds absorb solar actinic radiation, these results suggest that inorganic salts could significantly affect the photosensitized degradation of bisphenols and consequently influence the light-absorbing properties of marine aerosols and, ultimately, the Earth's radiative balance.
双酚A（BPA，4,4'-（丙烷-2,2-二基）二苯酚）是一种常见的增塑剂，在环境中广泛存在，由于塑料污染，在全球海洋中也以显著浓度被发现。在此我们表明，三重态敏化是天然地表水中双酚A的一种重要降解途径，当水体溶解有机碳含量高于2 - 3 mg/L时这种途径可能占主导。按照海水条件的溴化物水平有可能减缓双酚A的光降解，这一现象无法通过双酚A与溴的反应来抵消（二级反应速率常数为(2.54 ± 0.09)×10⁻⁹ M⁻¹ s⁻¹）。超高分辨率质谱显示，无机盐（氯化钠和溴化钠）的存在显著增加了双酚A光敏降解过程中所观察到的含碳氢氧产物化合物的复杂性。所得结果表明，与淡水和/或稀云水相比，双酚类化合物可通过光敏反应在海洋气溶胶的海面和液态水中被有效去除，并生成更多数量的低聚物和多环芳烃化合物。鉴于多环芳烃化合物吸收太阳光化辐射，这些结果表明无机盐可能会显著影响双酚类化合物的光敏降解，进而影响海洋气溶胶的光吸收特性，并最终影响地球的辐射平衡。
