Identification and fragmentation of hydrolyzed aluminum species by electrospray ionization tandem mass spectrometry

Abstract

Earlier characterization of some hydrolysis products of AlCl 3 ·6H 2 O was confirmed by electrospray ionization tandem mass spectrometry with increasing collision energy of projectile ions. At lower collision energies, the aqua ligands were stripped off. At higher energies, two hydroxo groups formed a bridging oxo group with loss of one water molecule. Aluminum complexes could also capture aqua ligands in the collision chamber so long as the parent ion did not fragment, and the fragment ion spectra broadened toward higher m/z values. The chloro ligands were eliminated as hydrochloric acid. The aluminum cores remained highly intact.

Role of Aluminum Speciation in the Removal of Disinfection Byproduct Precursors by a Coagulation Process

“…Through changing two hydroxo groups to a oxo group, the parent ion [Al 13O17(OH)3] 2+ lost one water to form [Al13O18(OH)] 2+ . This is consistent with previous literature (20). In addition, the signals both at m/z 337 and at m/z 328 were most likely overlapping signals.…”

“…Other product ions of signals at m/z 337 and 328 (e.g., fragments at m/z 298, 301, 329, and m/z 611) also were observed in the MS/MS spectra. As shown in Table 2 (18,20), who indicated that chloride ligands were eliminated as easily as hydrochloric acid with relatively low collision energies. Additionally, aluminum may be removed from the cores along with chloro ligands when three Al 10 were combined, and then the ion at m/z 329 was produced.…”

Colloidal surfaces and oligomeric species generated by water treatment chemicals

“…Many polymeric species have been discovered, with Al 13 one of the most the dominant (Zhang et al, 2004). In the mass spectrometric approach used in this study, the mix of oligomeric species in aqueous aluminium chloride solution has been found to be complex (Sarpola et al, 2004) and concentration dependent . In the present investigation, a new way of quantifying species from mass spectrometric results is introduced.…”

“…Details of the MS analyses have been presented in our previous publications (Sarpola et al, 2004;Hellman et al, 2006) and these were followed here strictly. The MS technique used, Micromass LCT with Z-spray electrospray interface, can distinguish between soluble cationic and anionic species with molecular mass to charge ratio (myz) over 100.…”

“…The speciation and structures of aluminium complexes have been investigated not only by potentiometric techniques but by X-ray diffraction (Seichter et al, 1998;Johansson, 1962), NMR (Bottero et al, 1980), and mass spectrometry (Sarpola et al, 2004. Many polymeric species have been discovered, with Al 13 one of the most the dominant (Zhang et al, 2004).…”