2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology
Fig. 5. Continuous variations of AlQSA complex at ph 4.
1 – c 0 = 1.1 × 10 –4 M, 635 V, 2 – c 0 = 5.6 × 10 –5 M, 705 V,
3 – 5.6 × 10 –5 M, 0.0012 M Zephyramine, 660 V
There are no interferences observed for na + and K + at
1,000 : 1 molar ratio. The effects of some other ions at optimalized
conditions are summarized in Fig. 6. no considerable
difference in the interferences is observed for the absence or
presence of cationic surfactant Zephyramine (Fig. 6.).
Fig. 6. Interferences for 0.3 μg cm –3 of each element at optimal
conditions in the presence of 0.0012 M Zephyramine
For the application, 0.04–1 μg cm –3 of Al 3+ , Ga 3+ and
In 3+ are determined in the excess of QSA in the presence of
0.0012 M Zephyramine and 0.05 M hexamethylentetramine
at pH 4 for Al, pH 3 for Ga and in the presence of 0.05 M
tetraborate at pH 8. In the presence of 0.05 M hexamethylentetramine
or sodium tetraborate 10% lower fluorescence
intensity is observed. 0.05 M MES is not suitable because of
larger fluorescence intensity decrease about 15 %.
s515
Conclusions
The collinear fluorescence spectra of complexes with
8-Hydroxyquinoline-5-sulphonic acid were used for the
study of Al, Ga, In complexes and determination of these
elements at pH 4, 3 or 8. Strictly linear calibration plots for
0.04 – 1 μg cm –3 of the metal ion are observed under optimized
conditions for the normal and first derivative spectra or in
the presence of cationic surfactant.
The efficiency of fluorescence intensity increases in
the presence of submicellar concentrations of cationic surfactants,
especially Zephyramine. The detection limits from
normal or first derivative spectra and in the submicellar media
are practically identical (0.03–0.05 μg cm –3 ), but sensitivity is
significantly increased in the presence of Zephyramine. Fatal
interferences are observed from Fe 3+ and PO 4 3– only.
For the individual determination of Al, Ga and In with
QSA hexamethylentetramine or sodium tetraborite buffers
are suitable. The multicomponent determination of these ions
can be carried out by approaching the PLS method 10 .
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