Major and trace element partitioning between dissolved and particulate phases in Antarctic surface snow
Major and trace element partitioning between dissolved and particulate phases in Antarctic surface snow
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DOI：
10.1039/c1em10215j
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发表时间：
2011-09-01
影响因子：
--
通讯作者：
Magi, E.
中科院分区：
文献类型：
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作者：
Grotti, M.;Soggia, F.;Magi, E.
为了提供对南极雪化学的新认识，在一些沿海和内陆雪样品中研究了溶解相和颗粒相（即不溶性颗粒，>0.45 mm）之间的主元素和微量元素的分配，沿着它们的总浓度和酸溶性（0.5%硝酸）浓度。碱金属和碱土金属元素（Na、K、Ca、Mg、Sr）主要存在于溶解相中，而Fe和Al主要与颗粒物相关联，内陆和沿海样品之间没有任何显著差异。另一方面，微量元素的分区取决于采样点的位置，从海岸移动到高原的颗粒物分数的一般减少。Cd，Cu，Pb和Zn的大部分是在溶解相，而Cr主要是与颗粒部分。钴，锰和V均匀分布在溶解和颗粒相之间的样品从高原和优先与沿海样品中的颗粒。元素之间的相关性和样品间的变异性，其浓度显着降低的高原样品相比，沿海的，根据金属源的相对贡献的变化，并在良好的协议与估计的海洋和地壳富集系数。此外，从高原样品的特点是较高的人为元素（镉，铬，铜，铅和锌）的富集系数，相比沿海地区。最后，观察到酸可溶解的金属浓度通常低于总浓度值，表明酸处理仅能溶解与颗粒相关的给定部分的金属（
In order to provide a new insight into the Antarctic snow chemistry, partitioning of major and trace elements between dissolved and particulate (i.e. insoluble particles, >0.45 mm) phases have been investigated in a number of coastal and inland snow samples, along with their total and acid-dissolvable (0.5% nitric acid) concentrations. Alkaline and alkaline-earth elements (Na, K, Ca, Mg, Sr) were mainly present in the dissolved phase, while Fe and Al were predominantly associated with the particulate matter, without any significant difference between inland and coastal samples. On the other hand, partitioning of trace elements depended on the sampling site position, showing a general decrease of the particulate fraction by moving from the coast to the plateau. Cd, Cu, Pb and Zn were for the most part in the dissolved phase, while Cr was mainly associated with the particulate fraction. Co, Mn and V were equally distributed between dissolved and particulate phases in the samples collected from the plateau and preferentially associated with the particulate in the coastal samples. The correlation between the elements and the inter-sample variability of their concentration significantly decreased for the plateau samples compared to the coastal ones, according to a change in the relative contribution of the metal sources and in good agreement with the estimated marine and crustal enrichment factors. In addition, samples from the plateau were characterised by higher enrichment factors of anthropogenic elements (Cd, Cr, Cu, Pb and Zn), compared to the coastal area. Finally, it was observed that the acid-dissolvable metal concentrations were generally lower than the total concentration values, showing that the acid treatment can dissolve only a given fraction of the metal associated with the particulate (