Characterization of aluminum species with nitrate, perchlorate and sulfate ions in the positive and negative ion mode by electrospray ionization mass spectrometry.
Characterization of aluminum species with nitrate, perchlorate and sulfate ions in the positive and negative ion mode by electrospray ionization mass spectrometry.
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DOI：
10.1002/jms.1485
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发表时间：
2009-02
期刊：
影响因子：
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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
讨论了电喷雾电离质谱 (ESI-MS) 在正离子和负离子模式下铝形态分析的应用。通过 ESI-MS 测量硝酸铝、高氯酸铝和硫酸铝溶液。在正离子模式下，鉴定出含有阴离子（Al-L；L=NO3、ClO4 和 SO4）的铝物质，其中 [Al(OH)2(H2O)n]+ (n=2-4) 是主要物质。 ESI-MS估计的阴离子与Al3+的亲和力与阴离子的硬度（硬酸和软酸碱原理）以及27Al核磁共振研究的结果一致。这表明从正离子模式观察到的结果保留了溶液中铝的化学状态。在负离子模式下，[Al(OH)4-nLn]- (n=0-2，L=NO3，ClO4) 是主要物质，被认为是由正铝物质 [Al(OH)(H2O)n]+ (n=2-4) 通过连续添加阴离子转化而来。阴离子不仅附着在一个铝离子上，而且还桥接两个铝离子。在Al2(SO4)3溶液中，SO4(2-)在负离子模式下的行为与NO3-和ClO4-不同。这可能反映了溶液中或质谱仪中或两者中 SO4(2-) 与 Al3+ 的亲和力。最后，提出了正离子和负离子模式下溶液中铝物质的检测机制。结果表明，ESI-MS可用于观察Al3+与阴离子之间的相互作用。我们展示了 ESI-MS 解释结果对于获得溶液中金属种类的新信息的重要性。
The application of electrospray ionization mass spectrometry (ESI-MS) for aluminum speciation in the positive and negative ion modes was discussed. Aluminum nitrate, perchlorate and sulfate solutions were measured by ESI-MS. In the positive ion mode, aluminum species containing anions (Al-L; L=NO3, ClO4 and SO4) were identified, while [Al(OH)2(H2O)n]+ (n=2-4) were the main species. The affinity of the anions with Al3+ estimated by ESI-MS was consistent with the hardness of the anions (hard and soft acids and bases principle) and the results from 27Al nuclear magnetic resonance studies. This indicates that the results observed from the positive ion mode preserved the chemical state of aluminum in the solution. In the negative ion mode, [Al(OH)4-nLn]- (n=0-2, L=NO3, ClO4) were the main species, which were considered to be converted from positive aluminum species, [Al(OH)(H2O)n]+ (n=2-4), by the successive addition of anions. Anions did not only attach to one aluminum ion but also bridged two aluminum ions. In Al2(SO4)3 solution, the behavior of SO4(2-) in the negative ion mode differed from that of NO3- and ClO4-. This may reflect the affinity of SO4(2-) with Al3+ in the solution or in the mass spectrometer or in both. Finally, detection mechanisms for the aluminum species in the solution are proposed for both the positive and negative ion modes. It is shown that ESI-MS can be used to observe the interaction between Al3+ and anions. We show the importance of the interpretation of the results by ESI-MS for obtaining new information of the metal species in the solution.