Effect of dissolved organic matter on sulfachloropyridazine photolysis in liquid water and ice

溶解有机碳 化学 光降解 超纯水 环境化学 光化学 羟基自由基 有色溶解有机物 浮游植物 环境科学 激进的 环境工程 有机化学 催化作用 光催化 营养物
作者
Jiyang Liu,Shuang Xue,Caihong Jiang,Zhaohong Zhang,Yingzi Lin
出处
期刊:Water Research [Elsevier]
卷期号:246: 120714-120714 被引量:9
标识
DOI:10.1016/j.watres.2023.120714
摘要

Dissolved organic matter (DOM) is an ubiquitous component of environmental snow and ice, which can absorb light and produce reactive species (RS) and thus is of importance in ice photochemistry. The photodegradation of sulfachloropyridazine (SCP) without and with DOM present in liquid water and ice were investigated in this study. The photodegradation rate constants for SCP without DOM present was enhanced by 52.5 % in ice relative to liquid water, likely due to the enhanced role of SCP self-sensitized RS in ice. DOM significantly promoted SCP photolysis in both liquid water and ice, which was mainly attributed to roles of singlet oxygen (1O2) and triplet excited-state DOM (3DOM*) generated from DOM. 1O2 production from DOM was significantly enhanced in ice relative to liquid water. Hydroxyl radical (•OH) production from DOM in ice was similar to those in liquid water. Enhancement in 3DOM* production in ice was observed at low DOM concentrations. Suwannee River Fulvic Acid (SRFA) and Elliott Soil Humic Acid (ESHA) exhibited differences in RS production in liquid water and ice, as well as in enhancement of 1O2 and 3DOM* produced in ice relative to liquid water. DOM induced reaction pathways of SCP different from those without DOM present, and therefore affected toxicity of SCP photoproducts. There were differences in photodegradation pathways of SCP as well as in toxicity of SCP photoproducts between liquid water and ice.
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