Electrospray ionization mass spectrometry investigation of the blocking effect of sulfate on the formation of aluminum tridecamer
Electrospray ionization mass spectrometry investigation of the blocking effect of sulfate on the formation of aluminum tridecamer
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DOI：
10.1016/j.molliq.2008.06.019
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发表时间：
2008-09
影响因子：
6
通讯作者：
T. Urabe;T. Tsugoshi;Miho Tanaka
中科院分区：
文献类型：
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作者：
T. Urabe;T. Tsugoshi;Miho Tanaka
在正离子模式下，用电喷雾电离质谱仪(ESI-MS)对不同pH值的铝水溶液(AlCl3和Al2(SO4)3)进行了研究。观察到几种含硫酸根离子的铝络合物，而不存在含氯离子的铝络合物。所形成的硫酸铝络合物为外球形。在AlCl3溶液中，用电喷雾质谱(ESI-MS)观察到Al13以二价离子和三价离子的形式存在，其存在已被多种方法证实。而在Al_2(SO_4)_3溶液中，未观察到与Al_(13)对应的峰。这表明硫酸盐离子的存在阻止了AL13的形成。硫酸根离子干扰了铝离子的水解平衡，提出了铝在硫酸根离子存在下不同的聚合/沉淀途径。由于ESI-MS可以根据它们的质量电荷比(m/z)分别鉴定溶液中的每一种铝物种，因此有望为铝离子的溶液化学提供新的信息。
Aluminum containing aqueous solutions (AlCl3and Al2(SO4)3) with several pH values were investigated by electrospray ionization mass spectrometry (ESI-MS) in the positive ion mode. Several aluminum complexes containing sulfate ions were observed, whereas aluminum complexes with chloride ions were absent. The aluminum sulfate complexes formed were considered to be outer-spherical. In AlCl3solution, aluminum tridecamer (Al13), whose existence has been confirmed by several methods, was observed by ESI-MS as divalent and trivalent ions. However, in Al2(SO4)3solution, no peaks corresponding to Al13were observed. This indicates that the presence of sulfate ions prevented the formation of Al13. The hydrolysis equilibria of aluminum ions were perturbed by sulfate ions, and different polymerization/precipitation pathways of aluminum in the presence of sulfate ions were suggested. Since each aluminum species in the solution can be separately identified by ESI-MS from their m/z (mass to charge ratio), it is expected that this method will provide new information on the solution chemistry of aluminum ions.