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eliminated by the addition of powdered silver sulphate, that of chlorates by the
introduction of 30% formaldehyde solution, that of antimony by chlorine water and that
of iron by reduction with tin(II) chloride powder.
Further fluorinated methods are based on the formation of binary or ternary hydroxy
flavone or ketone complexes with boron. The hydroxy flavones used are shown below.
Murata and Yamauchi [68] described the determination of boron with morin based on
the Taubock test [69]. A yellowish green fluorescence is produced in acetone solution.
The authors verified that the intensity of the fluorescence increased in the presence of
organic acids such as oxalic, malonic, succinic and phthalic acid. This method is
applicable to the analysis of non saline waters without the separation of boron.
Name
Substituent
Flavonol
Quercetin
Kaempferol
Morin
R
2
.
H
H
H
OH
R
3
.
OH
OH
OH
OH
R
3
ยท
H
OH
H
H
R
4
.
H
OH
OH
OH
R
5.
H
OH
OH
OH
R
5
.
H
H
H
H
R
6
H
H
H
H
R
6
H
H
H
H
R
7
H
OH
OH
OH
R
8
H
H
H
H
Ketones
Benzoin (i) is a fluorometric reagent widely used for the qualitative [70-73] and
quantitative [46,48,74-78] determination of boron.
(i)
Parker and Barnes [48] carried out some experiments with spectrofluorometers and filter
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