caa a22 4500 445881275 CHVBK 20180317145544.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00604-011-0646-8 doi (NATIONALLICENCE)springer-10.1007/s00604-011-0646-8 Preconcentrative separation of chromium(III) species from chromium(VI) by cloud point extraction and determination by flame atomic absorption spectrometry [Elektronische Daten] [Zeynep Yıldız, Gulsin Arslan, Ali Tor] We describe a high-throughput technique for the determination of chromium species in water samples by flame atomic absorption spectrometry (FAAS) after preconcentrative separation of Cr(III) species from Cr(VI) by cloud point extraction (CPE) using diethyldithiocarbamate (DDTC) as the chelating agent and the nonionic surfactant Triton X-100 as the extractant. The Cr(III)-DDTC complex is extracted if the temperature is higher than the CPE temperature of Triton X-100, while Cr(VI) remains in the aqueous phase. The Cr(III) in the surfactant phase was analyzed by FAAS, and the concentration of Cr(VI) was calculated by subtraction of Cr(III) from total chromium which was directly determined by FAAS. The effect of pH, concentration of chelating agent, surfactant, and equilibration temperature were investigated. The detection limit for Cr(III) was 0.08μgL−1with an enrichment factor of 98, and the relative standard deviation was 1.2% (n = 3, c = 100μgL−1). A certified reference material and several water samples were analyzed with satisfactory results. Figure (A) original solution with metals (circles) in low concentration; (B) metal chelates (squares) formed by addition of complexing reagent in the matrix solution; (C) addition of surfactant in the solution and trapping of metallic chelates into micellar cores; (D) micellar phase segregate after heating and separation after centrifugation. The determination of chromium species in water samples by FAAS after separation of Cr(III) from Cr(VI) by cloud point extraction using diethyldithiocarbamate and Triton X-100 was described. The LOD for Cr(III) was 0.08μgL−1with enrichment factor of 98, and the relative standard deviation was 1.2% (n = 3, c = 100μgL−1). Springer-Verlag, 2011 Cloud point extraction nationallicence Chromium nationallicence Diethyldithiocarbamate nationallicence Triton X-100 nationallicence Flame atomic absorption spectrometry nationallicence Yıldız Zeynep Department of Chemistry, Selcuk University, 42075, Konya, Turkey aut Arslan Gulsin Department of Chemistry, Selcuk University, 42075, Konya, Turkey aut Tor Ali Department of Environmental Engineering, Selcuk University, 42075, Konya, Turkey aut Microchimica Acta Springer Vienna 174/3-4(2011-09-01), 399-405 0026-3672 174:3-4<399 2011 174 604 https://doi.org/10.1007/s00604-011-0646-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-011-0646-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yıldız Zeynep Department of Chemistry, Selcuk University, 42075, Konya, Turkey aut NATIONALLICENCE 700 1- Arslan Gulsin Department of Chemistry, Selcuk University, 42075, Konya, Turkey aut NATIONALLICENCE 700 1- Tor Ali Department of Environmental Engineering, Selcuk University, 42075, Konya, Turkey aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 174/3-4(2011-09-01), 399-405 0026-3672 174:3-4<399 2011 174 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer