Ultra trace determination of lead and copper ions in water samples using polyamidoamine dendrimer supported on SBA-۱۵ nanomaterial

In this work, polyamidoamine dendrimer G(۱.۵) supported on SBA-۱۵ nanoporous is used as a novel sorbent for extraction and determination of Pb۲+ and Cu۲+ ions from environmental water specimens utilizing flame atomic absorption spectrometry. FTIR spectrum and thermal analysis were used to represent the existence of dendrimer groups in the silica framework. The various parameters like pH, concentration of eluent, extraction time, interfering ions on extraction efficiency were studied. Pb۲+ and Cu۲+ ions were completely extracted at pH= ۵-۸ after stirring for ۵ minutes. The minimum quantity of acid for stripping the ions from SBA- G۱.۵ was examined and the pre-concentration factor of the technique was ۲۳۳ for both of ions. Under the optimized conditions the linearity of the technique was within ۱۰-۴۰ ng mL−۱ Pb۲+ and ۲-۲۰ ng mL−۱ Cu۲+. Detection limits for Pb۲+ and Cu۲+ were ۵.۰ and ۱.۲ ng mL-۱ and the relative standard deviations (RSD, %, C=۱۵ ng mL-۱, n=۵) were ۲.۹ % and ۲.۱ %, respectively. There was a good consistency between the measured and added amount of Pb۲+ and Cu۲+ in spiked distilled water which shows good accuracy of the method. Capability of the method in real sample was tested in various water samples.

Keywords:

polyamidoamine dendrimer G(۱.۵) , SBA-۱۵ , Preconcentration , Cu۲+ and Pb۲+ , Water samples