Abstract Nitrated polycyclic aromatic hydrocarbons (NPAHs) are derived from PAHs, which are ubiquitous in the aqueous and atmospheric environments, and whose mutagenicity and carcinogenicity are much higher than that of PAHs. Therefore, their environmental transformation has attracted a lot of attention. In the present study, direct and indirect UV photodegradation kinetics of two NPAHs (1-nitropyrene and 1,8-dinitropyrene) in snow were investigated. It was found that the kinetics followed the pseudo-first-order kinetics with the photochemical degradation rate 0.3773 h−1 for 48.98 nM 1-NP and 0.3653 h−1 for 41.00 nM 1,8-DNP. Photosensitizers (hydrogen peroxide and nitrate) promoted the photodegradation of NPAHs. Considering the lower temperature and less microorganisms in snow environment, the photodegradation can be a key factor in determining the fate of NPAHs in sunlit surface snow. To the best of our knowledge, this is the first report on the photodegradation of NPAHs in snow.

中文翻译：

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雪中​​硝化多环芳烃的光化学降解

摘要 硝化多环芳烃（NPAHs）来源于多环芳烃，广泛存在于水环境和大气环境中，其致突变性和致癌性远高于多环芳烃。因此，它们的环境改造引起了很多关注。在本研究中，研究了雪中两种 NPAH（1-硝基芘和 1,8-二硝基芘）的直接和间接紫外光降解动力学。发现动力学遵循准一级动力学，48.98 nM 1-NP 的光化学降解速率为 0.3773 h-1，41.00 nM 1,8-DNP 的光化学降解速率为 0.3653 h-1。光敏剂（过氧化氢和硝酸盐）促进了 NPAH 的光降解。考虑到雪地环境温度较低，微生物较少，光降解可能是决定阳光照射的地表雪中 NPAH 归宿的关键因素。据我们所知，这是关于雪中 NPAH 光降解的第一份报告。