Metallic nanoparticle enrichment at low temperature, shallow CO2 seeps in Southern Italy
Metallic nanoparticle enrichment at low temperature, shallow CO2 seeps in Southern Italy
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低温下金属纳米颗粒富集，意大利南部浅层二氧化碳渗漏
DOI：
10.1016/j.marchem.2012.07.001
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发表时间：
2012
期刊：
影响因子：
3
通讯作者：
J. Lead
中科院分区：
文献类型：
--
作者：
E. Kádár;Andrew Fisher;B. Stolpe;R. Harrison;F. Parello;J. Lead
我们报告金属富集沿着自然pH梯度，由于增加CO2脱气在寒冷，浅渗漏的Vulcano岛在地中海，关闭西西里。我们评估了未过滤和过滤的海水（<100 nm）的成分，沿着环境和pH 5之间的酸性区域，并表明大多数渗出衍生元素作为纳米团簇存在，然后在与环境海水沿着pH梯度混合时聚集成更大的胶体。通过现代表征方法评估的这种天然存在的纳米颗粒的尺寸和元素组成与常规分析方法的结果非常一致。我们提供的分析证据表明，即使在典型的开放海洋pH值下，水柱中也存在大部分渗漏衍生元素（例如，约50%的铁，超过80%的Mn，100%的Cr，S和Zn），这些元素以纳米级颗粒（例如，<100 nm）的形式存在。我们推出现场采样协议和样品制备程序，适用于多种方法，以获得对环境样品中纳米颗粒的准确测量。基于我们的研究结果的第一个洞察力的形成天然纳米粒子在寒冷的CO2渗漏和持久性这样的纳米簇在周围的海水中规定。
We report on metal enrichment along a natural pH gradient owing to increased CO2degassing at cold, shallow seeps of Vulcano Island in the Mediterranean Sea, off Sicily. We assessed composition of unfiltered and filtered seawater (<100nm) along acidic zones ranging between ambient and pH 5, and showed that most seep derived elements are present as nanoclusters which then aggregate into larger colloids while mixing with ambient seawater along a pH gradient. Size and elemental composition of such naturally occurring nanoparticles assessed by modern characterisation methods were in good agreement with the results from conventional analytical methods. We provide analytical evidence for the presence in the water column of a large fraction of seep derived elements (e.g. approximately 50% of iron, over 80% of Mn, 100% of Cr, S and Zn) in the form of nano sized particles (e.g. <100nm) even at typical open ocean pHs. We launch in situ sampling protocols and sample preparation procedures for multi-method suitable to obtain accurate measurements on nanoparticles from environmental samples. Based on our results a first insight to the formation of natural nanoparticles at cold CO2seeps is presented and the persistence of such nano-clusters in the surrounding seawater is stipulated.