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本文以葡萄糖-6-磷酸(G-6-P)和2-氨基乙基膦酸(2-AEP)为有机磷化合物代表，利用室内模拟实验，考察腐殖酸HA、Fe3+、Cl~-、SO42-等对海水中有机磷光解过程的影响；借助自由基淬灭实验，明确·OH、~1O2对二者在不同介质中光解的作用。结果表明，紫外光(700W)照射下，G-6-P和2-AEP光解速率曲线可由一级动力学方程描述，纯水中G-6-P光解速率常数为0.24 h-1,高于2-AEP光解速率常数0.12 h-1,HA对G-6-P光解呈抑制作用，且浓度越高，抑制越强，其对2-AEP的抑制作用强于对G-6-P; Fe3+能显著促进G-6-P光解，但对2-AEP降解影响较小。NaCl(31.9)对G-6-P、2-AEP光解的抑制效应较强，Na_2SO4(31.9)对G-6-P光解无明显影响。纯水介质中，·OH、~1O2对G-6-P光解贡献率大于2-AEP,·OH、~1O2对G-6-P在纯水中光解贡献率为90%、88%,高于天然海水中的60%、56%。
Abstract：The effects of humic acid(HA),chloride ion(Fe3+), sulfate ion(SO42-) and chlorid ion(Cl~-) on photolysis of organophosphorus compounds represented by Glucose-6-phosphate(G-6-P) and 2-aminoethylphosphonic acid(2-AEP) were studied. The effects of hydroxyl radicals(·OH)and Singlet oxygen(~1O2)during the photolysis in different media were investigated. The photolysis rate curves of G-6-P and 2-AEP under UV light(UV)irradiation could be described by the first-order kinetic equation. In pure water, the photolysis rate constants of G-6-P was 0.24 h-1, which was higher than that of 2-AEP(0.12 h-1). HA inhibited the photolysis of G-6-P, and the inhibitory effect strengthened with HA concentration increasing. The inhibition of HA on 2-AEP photolysis was higher than that of G-6-P. Fe3+ significantly promoted the photolysis of G-6-P,while its effect on 2-AEP seemed relatively less. Sodium chloride(NaCl, 31.9) inhibited the photolysis of G-6-P and 2-AEP, while sodium sulphate(Na_2SO4,31.9) showed no obvious effect on the photolysis of G-6-P. Compared with 2-AEP, ·OH、~1O2 contri-buted more to the photolysis of G-6-P. For G-6-P, the contribution rates of ·OH and ~1O2 were 90% and 88% in pure water, which were higher than those in natural seawater(60%、56%).
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基本信息:
DOI：10.16441/j.cnki.hdxb.20230093
中图分类号:P734
引用信息:
[1]赵一霖,刘敏,周立敏,等.海水中常见组分对两种有机磷光解动力学影响[J].中国海洋大学学报(自然科学版),2024,54(07):56-62.DOI:10.16441/j.cnki.hdxb.20230093.
基金信息:
国家自然科学基金项目(41976137,41830534)资助~~
2023-03-09
2023
2023-05-23
2023-05-31
2023
1
2024-06-19
2024-06-19