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首页> 外文期刊>Atmospheric environment >Complexation of trace metals in size-segregated aerosol particles at nine sites in Germany
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Complexation of trace metals in size-segregated aerosol particles at nine sites in Germany

机译：在德国的9个地点，尺寸分离的气溶胶颗粒中的痕量金属络合

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The complexation of trace metal ions (TMI) was studied in size-segregated ambient aerosol particles collected at nine sites in Germany (urban, rural and coastal). Samples were analysed in terms of TMI (Fe, Mn, Cu), potential inorganic and organic ligands and pH. Using a thermodynamic model (E-AIM Ⅲ), the concentrations of these compounds in the particle liquid phase were estimated. The resulting liquid phase concentrations were then used as input parameters for a speciation model (Visual MINTEQ) and the equilibrium complexation was calculated under realistic conditions. The complexation was found to be controlled by the availability of strong organic ligands, especially oxalate, whose occurrence in turn was governed by the formation of insoluble Ca-oxalate. Likewise, the pH influenced oxalate availability because it alters the concentrations of the chelating mono- and dianions. As a qualitative result, Fe~(3+) was found to be mainly complexed by oxalate, while Fe~(2+) and Mn~(2+) were rather associated with nitrate. Cu~(2+) showed mixed organic and nitrate complexation. Complexation by HULIS was only significant for Fe~(3+) and Cu~(2+) and was generally less important than other ligands like oxalate and nitrate. Oxalate was found to exist mainly in the solid phase while higher dicarboxylic acids mostly did not form complexes due to protonation. Complexation was shown to be influenced by season, air mass origin, particle size and sampling site.
机译：在德国（城市，农村和沿海）的九个地点收集的大小分离的环境气溶胶颗粒中研究了痕量金属离子（TMI）的络合。根据TMI（铁，锰，铜），潜在的无机和有机配体以及pH值对样品进行分析。用热力学模型（E-AIMⅢ）估算了颗粒液相中这些化合物的浓度。然后将所得液相浓度用作形态模型（Visual MINTEQ）的输入参数，并在实际条件下计算平衡络合。发现该络合物受强有机配体尤其是草酸酯的可用性的控制，这些有机配体的发生又由不溶性草酸钙的形成控制。同样，pH影响草酸盐的利用率，因为它会改变螯合单价和二价阴离子的浓度。作为定性结果，发现Fe〜（3+）主要与草酸盐络合，而Fe〜（2+）和Mn〜（2+）与硝酸盐有关。 Cu〜（2+）显示出有机和硝酸盐混合的络合物。 HULIS的络合仅对Fe〜（3+）和Cu〜（2+）具有重要意义，通常不如草酸根和硝酸根等其他配体重要。草酸盐被发现主要存在于固相中，而高级二羧酸由于质子化而大多不形成络合物。结果表明，络合物受季节，空气质量来源，颗粒大小和采样位置的影响。

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