2.4. Sample extraction
The general procedure for extraction of ions by the functionalized
SBA-15 was as follows. To a suitable volume of 2 mg L1 solution
of Pb2+, Cu2+, Zn2+ and Cd2+, 10 mg of functionalized SBA-15
was added and the mixture was stirred for at least 10 min. Then,
the resulting mixture was filtrated on a paper filter. After the
extraction, the extracted ions by the functionalized SBA-15 were
stripped using 25 mL of 3.0 mol L1 solution of nitric acid into
25 mL volumetric flask. Finally, Pb2+, Cu2+, Zn2+ and Cd2+ content
in extracted and stripping solution was determined by FAAS.
2.4. Sample extractionThe general procedure for extraction of ions by the functionalizedSBA-15 was as follows. To a suitable volume of 2 mg L1 solutionof Pb2+, Cu2+, Zn2+ and Cd2+, 10 mg of functionalized SBA-15was added and the mixture was stirred for at least 10 min. Then,the resulting mixture was filtrated on a paper filter. After theextraction, the extracted ions by the functionalized SBA-15 werestripped using 25 mL of 3.0 mol L1 solution of nitric acid into25 mL volumetric flask. Finally, Pb2+, Cu2+, Zn2+ and Cd2+ contentin extracted and stripping solution was determined by FAAS.
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