Heterogeneous photochemical reaction of O₃ with humic acid (HA) under simulated sunlight was performed using a flow tube reactor coupled to an O₃ analyzer at ambient pressure. It was confirmed that light significantly enhanced the uptake of O₃ on HA. The initial uptake coefficient (γ_i) and the steady-state uptake coefficient (γ_ss) of O₃ under irradiation increased by 1.6 and 3.8 times compared to those in the dark, respectively. The γ_i and γ_ss on HA varied in the range of 0.76–2.77 × 10⁻⁵ and 1.50–9.55 × 10⁻⁶, respectively, which were dependent on various environmental factors including HA mass, total irradiance, initial O₃ concentration, O₂ content, temperature, relative humidity (RH) and HA solution pH. Both γ_i and γ_ss showed linear dependence on the total irradiance (0–2.07 × 10¹⁶ photons/(cm²⋅s)) of the light source, and increased with the HA mass (0–3.2 μg/cm²), temperature (278–298 K) and HA solution pH (4.0–9.6). However, they showed negative correlations with the initial O₃ concentration and O₂ content. The γ_i remained constant in the RH range of 7%–60%, while γ_ss exhibited the maximum value at RH = 20%. During the ozonization of HA under irradiation, some functional groups were consumed, including CH₂, CH₃, aromatic CC, OH, CO, COOH and COO⁻. HA aged by O₃ exhibited a decrease in the mass absorption efficiency (MAE) and a small increase in the absorption Ångström exponent between 300 and 600 nm wavelength (AAE_300,600), which was ascribed to changes in the composition of HA during the photochemical ozonization process.

O ₃与腐殖酸（HA）在模拟阳光下的异质光化学反应是通过在环境压力下使用连接到O ₃分析仪的流管反应器进行的。证实光显着增强了HA对O ₃的吸收。初始摄取系数（γ_我）和稳态摄取系数（γ _SS的O）₃照射下分别增加了1.6倍和3.8倍相比，那些在黑暗中。的γ_我和γ _SS上HA在0.76-2.77×10的范围内变化^-5和1.50-9.55×10 ^{- 6}分别取决于各种环境因素，包括HA质量，总辐照度，初始O ₃浓度，O ₂含量，温度，相对湿度（RH）和HA溶液pH。既γ_我和γ _SS呈线性关系的总辐照度（0-2.07×10 ¹⁶光子/（厘米^2个光源的⋅s）），并与HA质量增加（0-3.2微克/厘米²），温度（278–298 K）和HA溶液的pH（4.0–9.6）。但是，它们与初始O ₃浓度和O ₂含量呈负相关。该γ_我在7％-60％的RH范围内保持不变，而γ _SS显示出在RH = 20％的最大值。在HA的照射下臭氧化，一些功能性基团被消耗，包括CH ₂，CH ₃，芳族C C，OH，C O，COOH和COO ^- 。被O ₃老化的HA在300至600 nm波长（AAE _300,600）之间表现出质量吸收效率（MAE）降低和吸收Ångström指数的小幅增长，这是由于光化学臭氧化过程中HA的组成变化处理。