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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Quantum Yields of Nitrite (NO2-) from the Photolysis of Nitrate (NO3-) in Ice at 313 nm
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Quantum Yields of Nitrite (NO2-) from the Photolysis of Nitrate (NO3-) in Ice at 313 nm

机译：从313nm的冰中光解（NO2-）的量子产率（NO2-）在313nm处的冰中的光解

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摘要

Photochemical reactions of nitrate in snow release reactive nitrogen species via two channels, which produce (l) nitrogen dioxide (NO2) and hydroxyl radical ((OH)-O-center dot) and (2) nitrite (NO2-) and oxygen atom (O(P-3)). Quantum yields (phi) for these channels are generally well characterized, except for channel 2 in ice. In this study, we quantify phi(NO2-) in water ices and examine the impacts of pH and organic scavengers of (OH)-O-center dot. Compared to solution results, we find that nitrite quantum yields in ice are more sensitive to pH and that (OH)-O-center dot scavengers are less effective, although 2-propanol appears to work well. The temperature dependence (-30 to 25 degrees C) of phi(NO2-) in samples containing 2-propanol is well described by a single regression line, ln(phi(NO2-)) =-(1330 +/- 100)(1/T(K)) + (0.09 +/- 0.39). At -10 degrees C, the resulting quantum yield is 4.6 times larger than the previously reported (and recommended) value without an (OH)-O-center dot scavenger. Although some reports suggest nitrite is a minor product from nitrate photolysis, based on our current and past results, rates of photoproduction of NO2- and NO2 are similar at room temperature, while NO2- production dominates at lower temperatures in solution and ice.
机译：通过两个通道，即产生（L）二氧化氮（NO 2）和羟基自由基（（OH）-O-中心点）和（2）亚硝酸盐（NO 2 - ）和氧原子中的硝酸盐释放雪活性氮物质的光化学反应（ O（P-3））。量子产率（PHI），用于这些信道一般是充分表征的，除了信道2在冰中。在这项研究中，我们进行量化披（NO2-）在水冰和检查pH值的影响，并（OH）-O-中心点的有机清除剂。相比溶液的结果，我们发现在冰亚硝酸盐量子产率是至pH和（OH）-O-中心点清除剂更敏感不太有效的，尽管2-丙醇似乎工作良好。在含有2-丙醇的样品的温度依赖性披（-30度至25度C）（NO 2 - ）是公由单个回归线描述，LN（PHI（NO2-））= - （+/- 1330 100）（ 1 / T（K））+（0.09 +/- 0.39）。在-10℃下，将得到的量子产率是不具有（OH）-O-中心点清除剂比以前报道的（推荐）值大4.6倍。尽管有报道显示，亚硝酸盐是硝酸光解，基于我们当前和过去的结果次要产物，NO2-和NO2的光生率在室温下是相似的，而在解决方案和冰较低的温度下NO2-生产占主导地位。

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