EVOLVING FACTOR-ANALYSIS OF SYNCHRONOUS FLUORESCENCE-SPECTRA OF FULVIC-ACIDS IN THE PRESENCE OF ALUMINUM

被引:47
作者
SILVA, CSPCO [1 ]
DASILVA, JCGE [1 ]
MACHADO, AASC [1 ]
机构
[1] FAC CIENCIAS PORTO,DEPT CHEM,CIQ,P-4000 OPORTO,PORTUGAL
关键词
SYNCHRONOUS FLUORESCENCE; FULVIC ACIDS; EVOLVING FACTOR ANALYSIS; ALUMINUM;
D O I
10.1366/0003702944028281
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
The variations observed in synchronous fluorescence spectra of aqueous solutions (pH = 4) of three fulvic acids (fua) upon variation of the concentration of Al3+ were analyzed by evolving factor analysis (EFA). 'rhe three fua samples were extracted from materials present in a pinewood soil: dry pine needles and the upper and lower soil horizons. The presence of Al3+ induces quenching and enhancement of bands in the synchronous fluorescence spectra, and concentration constraints are proposed for the EFA analysis that allow the calculation, on a self-modeling curve resolution basis, of the number of components that show linearly independent variations, their spectra, and corresponding concentration profiles. Simulated and experimental data sets of simple known compounds (catechol, caffeic acid, salicylic acid, and morin) were also studied as the first validation of the experimental and data treatment procedures.
引用
收藏
页码:363 / 372
页数:10
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