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首页> 外文期刊>Journal of mass spectrometry: JMS >Metal-ligand solution equilibria studied by electrospray ionization mass spectrometry: effect of instrumental parameters
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Metal-ligand solution equilibria studied by electrospray ionization mass spectrometry: effect of instrumental parameters

机译：电喷雾电离质谱研究的金属-配体溶液平衡：仪器参数的影响

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摘要

Electrospray ionization mass spectrometry (ESI-MS) is being increasingly employed in the study of metal-ligand equilibria in aqueous solution. In the present work, the ESI-MS spectral changes due to different settings of the following instrumental parameters are analyzed: the solution flow rate (F-S), the nebulizer gas flow rate (F-G), the sprayer potential (E), and the temperature of the entrance capillary (T). Twenty-eight spectra were obtained for each of six samples containing aluminum(III) and 2,3-dihydroxypyridine at various pH, in the absence or in the presence of a buffer and of sodium ions. Among the considered instrumental parameters, T produced the largest effects on the ionic intensities. F-S and FG affected the ESI-MS spectra to a lower extent than T. In the investigated conditions E had the weakest effects on the spectra. The correlations observed between the ionic intensities and these instrumental parameters were interpreted considering the presence of three kinds of perturbations occurring in the ESI-MS ion source: formation of some dimers in the droplets, different transfer efficiencies from the droplets to the gas phase for different complexes (according to their surface activity), and subsequent partial thermal decomposition of the dimers and of one of the monomeric complexes in the gas phase. Our results show that the evaluation of the effects produced in the ESI-MS spectra by a change of instrumental parameters can allow to identify the perturbations occurring when metal-ligand solutions are studied by ESI-MS.
机译：电喷雾电离质谱法（ESI-MS）越来越多地用于研究水溶液中的金属-配体平衡。在当前工作中，分析了由于以下仪器参数的不同设置而导致的ESI-MS光谱变化：溶液流速（FS），雾化器气体流速（FG），喷雾器电势（E）和温度入口毛细管（T）的角度。在不存在或存在缓冲液和钠离子的情况下，在不同pH值下，含铝（III）和2,3-二羟基吡啶的六个样品中的每个样品均获得了28个光谱。在考虑的仪器参数中，T对离子强度的影响最大。 F-S和FG对ESI-MS光谱的影响程度小于T。在研究条件下，E对光谱的影响最弱。考虑到ESI-MS离子源中存在三种扰动，解释了离子强度与这些仪器参数之间的相关性：液滴中一些二聚体的形成，不同液滴从液滴向气相的转移效率不同配合物（根据其表面活性）以及随后在气相中二聚物和一种单体配合物的部分热分解。我们的结果表明，通过改变仪器参数对ESI-MS光谱中产生的效应进行评估，可以确定通过ESI-MS研究金属配体溶液时发生的扰动。

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