Aluminum speciation of coagulants with low concentration: Analysis by electrospray ionization mass spectrometry

被引：35
作者：
Zhao, He [1 ,2 ]
Liu, Huijuan [1 ]
Qu, Jiuhui [1 ]
机构：
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
[2] Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2011年 / 379卷 / 1-3期
基金：
中国国家自然科学基金;
关键词：
Electrospray ionization; Aluminum speciation; Coagulant; Hydrolyzed species; BY-PRODUCT PRECURSORS; HYDROLYSIS PRODUCTS; MAGNETIC-RESONANCE; COMPLEX-FORMATION; MECHANISM; SALICYLATE; IONS; KINETICS; SALTS; POLYMERIZATION;
D O I：
10.1016/j.colsurfa.2010.11.045
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Aluminum speciation of coagulants with low concentration was investigated in detail by electrospray ionization mass spectrometry (ESI-MS). In particular, comparison with Al-27 nuclear magnetic resonance (Al-27 NMR) and Ferron colorimetric method for aluminum speciation of coagulants was discussed. The results indicated that various hydrolyzed aluminum species (monomeric, dimeric, trimeric and tetrameric aluminum species), which could not be identified by other methods, appeared in ESI-MS spectra. Thus. ESI-MS method was much better for hydrolyzed aluminum species in low concentration. In this paper. sample cone voltage was an important operating parameter during ESI-MS detection, and optimum voltage was 70V. Too low (40V) or high (150V) sample cone voltage was not suitable for detecting all aluminum species. This study also evaluated the effects of coagulant concentration, aging, pH value and organic matter on aluminum species distribution. The results indicated that the distribution of hydrolyzed aluminum species at low concentration was largely dependent on the solution pH. At higher pH conditions, aging (8-12h) may influence aluminum hydrolysis. Additionally, after adding salicylic acid into coagulant solutions. speciation and stability for both Al-13 species and aluminum-salicylate complexes varied significantly at different pH values. (C) 2010 Elsevier B.V. All rights reserved.
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收藏
页码：43 / 50
页数：8
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