caa a22 4500 445880619 CHVBK 20180317145541.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00604-011-0578-3 doi (NATIONALLICENCE)springer-10.1007/s00604-011-0578-3 Speciation of Cr(III) and Cr(VI) ions using a β-cyclodextrin-crosslinked polymer micro-column and graphite furnace atomic absorption spectrometry [Elektronische Daten] [Ying Gu, Xiashi Zhu] A sensitive and selective method for the speciation of Cr(III) and Cr(VI) in water samples was developed. It is based on the selective binding of the complex formed between Cr(III) and 4-(2-pyridylazo)resorcinol adsorbed on a cross-linked polymer modified with β-cyclodextrin and placed in a micro-column. Graphite furnace atomic absorption spectrometry (GFAAS) was used to quantify chromium. Cr(VI) ion is not adsorbed but remains in the aqueous sample phase. Thus, an in-situ separation of Cr(VI) and Cr(III) is accomplished. The concentration of Cr (VI) was calculated by subtracting the value for Cr(III) from that for total chromium. Under optimum conditions, the limit of detection of Cr(III) is 0.056μgL−1, and the linear range is from 2.0 to 160.0μgL−1. The relative standard deviation is 2.5% (n = 3, at 30.0μgL−1). The preconcentration factor is 25. The method was applied to the speciation of chromium in water samples, and recoveries in spiked real samples range from 101.9% to 104.5%. A reference water sample (GBW(E)080642) also was analyzed, and the results were in good agreement with the certified values. Figure The quantitative adsorption (≥90%) on the β-CDCP for Cr(III) was found in the range of the pH 5.5-6.0, whereas the adsorption efficiency for Cr(VI) at this pH range was rather low. Springer-Verlag, 2011 Cr(III) and Cr(VI) nationallicence β-Cyclodextrin cross-linked polymer nationallicence Solid phase extraction nationallicence Graphite furnace atomic absorption spectrometry nationallicence Gu Ying College of Chemistry & Chemical Engineering, Yangzhou University, 225009, Yangzhou, China aut Zhu Xiashi College of Chemistry & Chemical Engineering, Yangzhou University, 225009, Yangzhou, China aut Microchimica Acta Springer Vienna 173/3-4(2011-06-01), 433-438 0026-3672 173:3-4<433 2011 173 604 https://doi.org/10.1007/s00604-011-0578-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-011-0578-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gu Ying College of Chemistry & Chemical Engineering, Yangzhou University, 225009, Yangzhou, China aut NATIONALLICENCE 700 1- Zhu Xiashi College of Chemistry & Chemical Engineering, Yangzhou University, 225009, Yangzhou, China aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 173/3-4(2011-06-01), 433-438 0026-3672 173:3-4<433 2011 173 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer