Iodine speciation in rain and snow: Implications for the atmospheric iodine sink
Iodine speciation in rain and snow: Implications for the atmospheric iodine sink
复制标题
DOI：
10.1029/2006jd007356
复制
发表时间：
2007-04
影响因子：
--
通讯作者：
B. Gilfedder;M. Petri;H. Biester
中科院分区：
文献类型：
--
作者：
B. Gilfedder;M. Petri;H. Biester
大气碘模型目前预测碘酸盐是对流层中唯一稳定的碘汇物种。然而，使用离子色谱仪电感耦合等离子体质谱（IC-ICP-MS）显示，碘酸盐是在德国南部、瑞士阿尔卑斯山和巴塔哥尼亚（智利）不同地点收集的降水（雨和雪）中含量最少的碘种。大多数碘与有机化合物有关（平均56%），其次是碘化物（平均27%）。尽管有机部分的确切结构尚不清楚，而且可能具有更高的分子量，但较小部分的碘有机化合物是阴离子的（占总I的5-20%）。其中一个阴离子有机i峰出现在所有雨和大多数雪的色谱图中，通常占总碘的5-18%。这表明大气中碘的种类无处不在。这些数据表明，有机碘化合物在全球大气碘循环和大气碘汇中起着重要作用。因此，未来的对流层碘模型必须考虑有机i反应。
[1] Atmospheric iodine models currently predict iodate as the only stable iodine sink species in the troposphere. However, it is shown here using ion chromatograph inductively coupled plasma-mass spectroscopy (IC-ICP-MS) that iodate is the least abundant iodine species in precipitation (rain and snow) collected from various locations in southern Germany, the Swiss Alps, and Patagonia (Chile). The majority of iodine is associated with organic compounds (average 56%) followed by iodide (average 27%). Although the exact structure of the organic fraction remains ambiguous and is probably of higher molecular weight, a smaller portion of the iodo-organic compounds are anionic (5–20% of total I). One of these anionic organo-I peaks is present in all rain and most snow chromatograms and is generally responsible for 5–18% of total iodine. This suggests a ubiquitous atmospheric iodine species. The data indicate that organic iodine compounds play an important role in the global atmospheric iodine cycle and the atmospheric iodine sink. As such, future tropospheric iodine models must consider organic-I reactions.