To reveal the fate of anthracene (ANT) in soil, the photodegradation behavior of ANT was systematically studied using SiO₂ to simulate a soil environment. Under xenon lamp irradiation, more than 90% of ANT loaded on SiO₂ could be removed after 240 min. Moreover, the effects of water content, chloride ions (Cl^-) and humic acid (HA) were examined. It was found that the presence of water and HA can significantly inhibit the photolysis of ANT on SiO₂, while the addition of chloride alone has no obvious effect. However, when water is present, the inhibition effect of chloride became more obvious. According to radical quenching experiments and electron paramagnetic resonance (EPR) spectra, hydroxyl radicals (•OH) and chlorine radicals (Cl•) were formed in the system. Possible reaction pathways were speculated based on products identified by mass spectrometry. ANT was attacked by •OH to form hydroxylated products, which can be further hydroxylated and oxidized with the final formation of ring-opening products. ANT directly excited by light may also react with Cl• to produce chlorinated polycyclic aromatic hydrocarbons (Cl-PAHs). Finally, the experimental results were verified on real soil. This study provides important information for understanding the photochemical transformation mechanism of ANT at the soil/air interface.

为了揭示蒽 (ANT) 在土壤中的归宿，使用 SiO ₂模拟土壤环境系统地研究了 ANT 的光降解行为。_{在氙灯照射下，240 min后，SiO 2}上负载的ANT可去除90%以上。^{此外，还检查了水含量、氯离子 (Cl -} ) 和腐殖酸 (HA)的影响。发现水和HA的存在可以显着抑制ANT对SiO _2的光解，而单独添加氯化物没有明显效果。但是，当有水存在时，氯化物的抑制作用更加明显。根据自由基淬灭实验和电子顺磁共振(EPR) 光谱，系统中形成了羟基自由基(•OH) 和氯自由基(Cl•)。根据质谱鉴定的产物推测可能的反应途径。ANT 被•OH 攻击形成羟基化产物，羟基化产物可进一步羟基化和氧化，最终形成开环产物。ANT 直接被光激发也可能与 Cl• 反应生成氯化多环芳烃 (Cl-PAHs)。最后在真实土壤上对实验结果进行了验证。