SINGLET OXYGEN IN SURFACE WATERS .3. PHOTOCHEMICAL FORMATION AND STEADY-STATE CONCENTRATIONS IN VARIOUS TYPES OF WATERS
SINGLET OXYGEN IN SURFACE WATERS .3. PHOTOCHEMICAL FORMATION AND STEADY-STATE CONCENTRATIONS IN VARIOUS TYPES OF WATERS
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DOI：
10.1021/es00146a005
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发表时间：
1986-04-01
影响因子：
11.4
通讯作者：
HOIGNE, J
中科院分区：
文献类型：
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作者：
HAAG, WR;HOIGNE, J
为了预测有机化合物被氧化的速率和在水环境中通过1 O2途径形成的光产物，通过使用糠醇作为捕集剂测定了1 O2在各种沃茨中的稳态浓度。在正午、夏季阳光（瑞士）下，在湖泊、河流和废水中，表面浓度为（0.3-3）× 10 - 4。10-14 M ~（10）O ~ 2/mg DOC/L。对于给定量的吸收光，颜色更深的沃茨实际上倾向于产生更少的1 O2。天然水生有机化合物的凝胶渗透色谱分离的馏分显示1 O2的生产效率和分子量之间的相关性很小，表明大分子结构不是敏化1 O2形成的先决条件。应用特定的1 O2浓度数据来估计环境污染物的寿命，仅对少数特别活跃的化合物类型产生短至数小时的半衰期，但对预期在水生环境中发现的大多数化合物来说，半衰期要长几个数量级。
For prediction of the rate with which organic compounds are oxidized and photoproducts formed in the aquatic environment by the 1O2 route, the steady-state concentrations of 1O2 in various waters were determined by using furfuryl alcohol as a trapping agent. Under noon, summer sunlight (Switzerland) in lake, river, and wastewaters, surface concentrations were (0.3-3) .times. 10-14 M 1O2 per mg of DOC/L. The more highly colored waters actually tend to produce less 1O2 for a given amount of adsorbed light. Separation of natural aquatic organic compounds by gel permeation chromatography resulted in fractions showing little correlation between 1O2 production efficiency and molecular weight, indicating that large macromolecular structures are not a prerequisite for the sensitization of 1O2 formation. Application of the specific 1O2 concentration data to the estimation of lifetimes of environmental pollutants yields half-lives as short as several hours only for a few especially reactive types of compounds but orders of magnitude longer for most of the compounds expected to be found in the aquatic environment.