In this study, the kinetics and mechanism of UV/O₃ synergistic oxidative digestion of dissolved organic phosphorus (DOP) were investigated, focusing on the ozone direct oxidation and hydroxyl radical oxidation parts of glufosinate and triphenyl phosphate (TPhP). The p-chlorobenzoic acid (p-CBA) was selected as the probe compound, and two kinds of reaction kinetic models were proposed by competitive kinetic method with R_ct according to the different scale of rate constants of hydroxyl radical oxidation. Under the condition of weakly alkaline (pH = 9.0) and weakly acidic environment (pH = 5.0), the second-order rate constants of glufosinate and TPhP was determined indirectly to be ko_{3/glufosinate} = (2.903 ± 0.247)M⁻¹s⁻¹ and ko_3/TPhP = (3.307 ± 0.204) M⁻¹s⁻¹ by ozone direct oxidation, and k_{·OH/glufosinate} = (1.257 ± 1.031) × 10⁹ M⁻¹s⁻¹ and k_·OH/TPhP = (7.120 × 10⁸ ± 0.963) M⁻¹s⁻¹ by hydroxyl radical oxidation, respectively. The comparison of the contribution levels of the two parts to the digestion process showed that the contribution levels in the digestion of glufosinate and TPhP processes both the contribution of ·OH were higher than those of ozone, 86.3% and 72.6%, respectively.

中文翻译：

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UV/O3 过程消解溶解有机磷 (DOP) 的动力学和机理

本研究研究了UV/O ₃协同氧化消解溶解性有机磷(DOP)的动力学和机理，重点研究了草铵膦和磷酸三苯酯(TPhP)的臭氧直接氧化部分和羟自由基氧化部分。选择对氯苯甲酸（p-CBA）作为探针化合物，根据羟基自由基氧化速率常数的不同尺度，采用R _{ct竞争动力学方法提出了两种反应动力学模型。}在弱碱性(pH=9.0)和弱酸性环境(pH=5.0)条件下，间接测定草铵膦和TPhP的二级速率常数为k o _3/草铵膦 =(2.903±0.247)M ⁻¹ s ^-1和k o _3/TPhP  = (3.307 ± 0.204) M ^-1 s ^-1通过臭氧直接氧化，k _{·OH/草铵膦} = (1.257 ± 1.031) × 10 ⁹  M ^-1 s ^-1和k _{· OH/TPhP}  = (7.120 × 10 ⁸  ± 0.963) M ^-1 s ^-1分别通过羟基自由基氧化。两部分对消化过程的贡献水平比较表明，草铵膦和TPhP消化过程中·OH的贡献水平均高于臭氧的贡献水平，分别为86.3%和72.6%。