ALUMINUM SPECIATION USING MORIN .1. MORIN AND ITS COMPLEXES WITH ALUMINUM

被引:54
作者
BROWNE, BA
MCCOLL, JG
DRISCOLL, CT
机构
[1] UNIV CALIF BERKELEY,DEPT PLANT & SOIL BIOL,BERKELEY,CA 94720
[2] SYRACUSE UNIV,DEPT CIVIL ENGN,SYRACUSE,NY 13210
关键词
D O I
10.2134/jeq1990.00472425001900010008x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this and a companion study, we developed a procedure that uses the fluorescing chelating agent morin (2,3,4,5,7-pentahydroxy-flavone) to speciate aqueous Al in the acidic pH range. Morin is a pentaprotic acid with five weakly acidic functional groups. However, only the first proton dissociation reaction was found to be significant in the acidic pH range, and a simple monoprotic model (pK(al) = 5.04) accurately described proton binding. Aluminum and morin formed complexes of 1:1 and 1:2 and/or 1:3 (Al/morin) stoichiometry, but at low total morin concentrations (near 1 μM) only 1:1 species were prevalent. The equilibrium chemistry of 1:1 Al/morin complexes in the acidic pH range was closely described by a parabolic model consistent with the formation of three complexes: AIH4MOR2+, Al(OH)H4MOR+, and Al(OH)2H4MOR0. For Al and six potentially interfering cations, the order of affinity for morin relative to Al in the acidic pH range was approximately as follows: Al > Fe(III) > Cu > Fe(II) > Ca > Mg > Mn = Zn. Formation of competing cation-morin complexes was enhanced with increasing pH. None of the tested cations formed complexes with morin with fluorescence spectra overlapping the spectra of the Al-morin complexes.
引用
收藏
页码:65 / 72
页数:8
相关论文
共 20 条
[1]  
Baker J.P., 1982, P165
[2]   ALUMINUM TOXICITY TO FISH IN ACIDIC WATERS [J].
BAKER, JP ;
SCHOFIELD, CL .
WATER AIR AND SOIL POLLUTION, 1982, 18 (1-3) :289-309
[3]  
Bauer H. H., 1978, INSTRUMENTAL ANAL
[4]   ALUMINUM SPECIATION USING MORIN .2. PRINCIPLES AND PROCEDURES [J].
BROWNE, BA ;
DRISCOLL, CT ;
MCCOLL, JG .
JOURNAL OF ENVIRONMENTAL QUALITY, 1990, 19 (01) :73-82
[5]  
DICKSON W, 1978, VERH INT VEREIN THEO, V20, P851
[6]   PHYSIOLOGY OF METAL TOXICITY IN PLANTS [J].
FOY, CD ;
CHANEY, RL ;
WHITE, MC .
ANNUAL REVIEW OF PLANT PHYSIOLOGY AND PLANT MOLECULAR BIOLOGY, 1978, 29 :511-566
[7]  
HEM JD, 1968, 1827B US GEOL SURV W
[8]   FLUORIMETRIC DETERMINATION OF ALUMINUM WITH MORIN AFTER EXTRACTION WITH ISOBUTYL METHYL KETONE .1. FLUORESCENCE OF THE ALUMINUM - MORIN COMPLEX IN AN ISOBUTYL METHYL KETONE - ETHANOL - WATER-SYSTEM [J].
HERNANDEZ, FH ;
ESCRICHE, JM .
ANALYST, 1984, 109 (12) :1585-1588
[9]  
IZATT RM, 1969, J CHEM SOC A, V45, P47, DOI DOI 10.1039/J19690000047
[10]  
Job P, 1928, ANN CHIM FRANCE, V9, P113