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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photolysis Kinetics of Toluene, Ethylbenzene, and Xylenes at Ice Surfaces
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Photolysis Kinetics of Toluene, Ethylbenzene, and Xylenes at Ice Surfaces

机译：冰表面甲苯，乙苯和二甲苯的光解动力学

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摘要

Benzene, toluene, ethylbenzene, and xylenes (BTEX) are important organic pollutants. These compounds do not undergo direct photolysis in natural Waters, because their absorbance spectra do not overlap with solar radiation at the Earth's surface. Recent research has suggested that benzene is able to undergo direct photolysis when present at ice surfaces. However, the photolysis of toluene, ethylbenzene, and xylenes (TEX) at ice surfaces has not been investigated.. Using fluorescence spectroscopy, photolysis rate constants were measured for TEX in water, in ice,cubes, and in ice granules which reflect reactivity at ice surfaces. No photolysis was observed in water or ice cubes. Photolysis was observed in ice granules; rate constants were (4.5 +/- 0.5) x 10(-4) s(-1) (toluene), (5.4 +/-0.3) x 10(-4) s(-1) (ethylbenzene), and, (3.8 +/- 1.2) x 10(-4) s(-1) (xylenes). Photolysis of TEX molecules appears to be enabled by a red shift in the absorbance spectra at ice surfaces, although photosensitization may also occur. The remits suggest that direct photolysis could be an important removal pathway for TEX in snow-covered environments.
机译：苯，甲苯，乙苯和二甲苯（BTEX）是重要的有机污染物。这些化合物在自然水域中不会直接进行光解，因为它们的吸收光谱不会与地球表面的太阳辐射重叠。最近的研究表明，冰表面存在时，苯能够直接光解。然而，尚未研究甲苯，乙苯和二甲苯（TEX）在冰表面的光解作用。使用荧光光谱法，测量了水中，冰块，立方体和冰粒中TEX的光解速率常数，这些常数反映了在室温下的反应性。冰表面。在水或冰块中未观察到光解。在冰粒中观察到光解;速率常数为（4.5 +/- 0.5）x 10（-4）s（-1）（甲苯），（5.4 +/- 0.3）x 10（-4）s（-1）（乙苯）和3.8 +/- 1.2）x 10（-4）s（-1）（二甲苯）。 TEX分子的光解似乎是由于冰表面吸收光谱的红移引起的，尽管也可能发生光敏化。这些职权范围表明，在积雪覆盖的环境中，直接光解可能是TEX的重要去除途径。

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