Iodine speciation in marine aerosols along a 15 000-km round-trip cruise path from Shanghai, China, to the Arctic Ocean
Iodine speciation in marine aerosols along a 15 000-km round-trip cruise path from Shanghai, China, to the Arctic Ocean
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DOI：
10.1071/en10048
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发表时间：
2010-10
影响因子：
4.3
通讯作者：
Si-qi Xu;Z. Xie;Bing Li;Wei Liu;Liguang Sun;Hui Kang;Hong-xia Yang;Pengfei Zhang
中科院分区：
文献类型：
--
作者：
Si-qi Xu;Z. Xie;Bing Li;Wei Liu;Liguang Sun;Hui Kang;Hong-xia Yang;Pengfei Zhang
环境背景：大气中的碘在对流层臭氧破坏和气候变化方面发挥着重要作用。然而，由于气溶胶中碘形态的不确定性，对大气碘的循环仍然知之甚少。在这里，我们报告碘水平和形态的海洋气溶胶收集沿沿着巡航路径从上海到北冰洋。摘要：利用电感耦合等离子体质谱法和离子色谱-电感耦合等离子体质谱法分别测定了从中国上海到北冰洋的往返航行中收集的总悬浮颗粒物样品中的总碘（TI）和水溶性碘。TI和总可溶性碘（TSI）的水平变化很大的空间和时间上的航程长度。碘含量最高值出现在9月的北冰洋，而最低值出现在7月的西太平洋和北方太平洋。在大多数样品中，碘酸盐（IO 3-）是占优势的物种，平均占TSI的57.8%，而碘化物和可溶性有机碘平均仅占TSI的16.8%。还存在显著部分的不溶性碘。这一发现证实了大气碘形态的模型预测，即主要的碘物种是碘酸盐而不是碘化物。
Environmental context.Iodine in the atmosphere plays an important role in troposphere ozone destruction and climate change. However, cycling of atmospheric iodine is still poorly understood because of uncertainties in iodine speciation in aerosols. Here we report iodine levels and speciation in marine aerosols collected along a cruise path from Shanghai to the Arctic Ocean. Abstract.Total iodine (TI) and water-soluble iodine species in the total suspended particle samples collected onboard a round-trip cruise from Shanghai, China to the Arctic Ocean were measured using inductively coupled plasma mass spectrometry and ion chromatography–inductively coupled plasma mass spectrometry respectively. TI and total soluble iodine (TSI) levels varied considerably both spatially and temporally over the length of the voyage. The maximum iodine levels occurred in the Arctic Ocean in September, whereas the minimum levels occurred in the Western and Northern Pacific Ocean in July. Iodate (IO3 –) was found to be the dominant species in most samples, accounting for 57.8% of TSI on average, whereas iodide and soluble organic iodine only accounted for 16.8% of TSI on average. There was also a significant fraction of insoluble iodine. This finding confirms model predictions of atmospheric iodine speciation, i.e. the predominant iodine species is iodate rather than iodide.