Propranolol (PRO) is frequently detected in estuarine and coastal waters, which has adverse effects on estuarine and coastal ecosystems. In this study, the effects of halide ions and DOM from estuarine and coastal waters on the photochemical transformation of PRO were investigated. The results demonstrated that the presence of Br^- alone exhibited slight effect on photochemical transformation of PRO, while photodegradation rates of PRO increased with the addition of 0.1–0.54 M Cl^-. The quenching experiments and the laser flash photolysis experiments together demonstrated the generation of Cl₂^•— in the photolytic systems. Cl₂^•— is possibly produced through the charge separation of exciplex of ³PRO* and Cl^- rather than via direct oxidation of Cl^-. Additional experiments indicated that addition of seawater DOM inhibited the halide ions-sensitized photodegradation rates of PRO, which may be due to the quenching of Cl₂^•— by phenolic substances in DOM molecules. Compared with pure water, three new photochemical intermediates were identified in the presence of DOM or Cl^-. The direct photolysis of PRO mainly reacted by hydroxyl additions, hydroxyl elimination and de-propylation, whereas electron transfer coupled with H-abstraction by Cl₂^•— and ³DOM* was proposed as the primary role for PRO degradation in the presence of Cl^- or DOM.

普萘洛尔（PRO）经常在河口和沿海水域中检出，对河口和沿海生态系统产生不利影响。在这项研究中，研究了来自河口和沿海水域的卤离子和DOM对PRO光化学转化的影响。结果表明，溴的存在^-单独显示对PRO的光化学转化轻微的影响，而光降解PRO率在加入0.1-0.54中号的Cl增加^- 。淬灭实验和激光闪光光解实验一起证明了在光解体系中Cl ₂ ^•-的生成。Cl ₂ ^•-可能是通过³的激基复合物的电荷分离产生的PRO *和Cl ^-而不是通过氯直接氧化^- 。额外的实验表明，添加海水DOM可以抑制PRO卤化物离子敏化的光降解速率，这可能是由于DOM分子中的酚类物质对Cl ₂ ^•的猝灭所致。用纯水相比，三个新的光化学中间体DOM或Cl的存在进行鉴定^- 。的PRO直接光解主要的反应是羟基的添加，羟基消除和去丙基化，而电子转移被C加上H-抽象₂ ^{• -}和³ DOM *被提出作为PRO降解在氯的存在的主要作用^- 或DOM。