caa a22 4500 445881070 CHVBK 20180317145543.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s00604-011-0553-z doi (NATIONALLICENCE)springer-10.1007/s00604-011-0553-z New method for microextraction of ultra trace quantities of gold in real samples using ultrasound-assisted emulsification of solidified floating organic drops [Elektronische Daten] [Somayeh Tajik, Mohammad Taher] A method was developed for the determination of gold ion in water samples using microextraction based on the ultrasound-assisted emulsification of solidified floating organic drops, followed by the flame atomic absorption spectrometry. N-(4-{4-[(anilinocarbothioyl)amino]benzyl}phenyl)-N-phenylthiourea was used as chelating agent. The parameters affecting the extraction and complex formation (including the type and volume of the extracting solvent, time of sonication and centrifugation, pH, amount of the chelating agent, and sample ionic strength) were optimized. Under the optimum conditions, the calibration graph is linear in the range from 1.5 to 400ng mL−1, with a limit of detection of 0.45ng mL−1. The relative standard deviation for ten replicate determinations of gold ion in a concentration of 175ng mL−1 was 1.7%. The procedure was successfully applied to the determination of gold in water samples, in pharmaceutical and synthetic samples, and in a standard reference material. Figa The schematic procedure of the ultrasound-assisted emulsification solidified floating organic drop microextraction is shown in above figure from A to E. Springer-Verlag, 2011 Ultrasound-assisted emulsification nationallicence Solidified floating organic drop microextraction nationallicence Flame atomic absorption spectrometry nationallicence Gold determination nationallicence Tajik Somayeh Department of Chemistry, Shahid Bahonar University of Kerman, 76169, Kerman, Iran aut Taher Mohammad Department of Chemistry, Shahid Bahonar University of Kerman, 76169, Kerman, Iran aut Microchimica Acta Springer Vienna 173/1-2(2011-04-01), 249-257 0026-3672 173:1-2<249 2011 173 604 https://doi.org/10.1007/s00604-011-0553-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-011-0553-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tajik Somayeh Department of Chemistry, Shahid Bahonar University of Kerman, 76169, Kerman, Iran aut NATIONALLICENCE 700 1- Taher Mohammad Department of Chemistry, Shahid Bahonar University of Kerman, 76169, Kerman, Iran aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 173/1-2(2011-04-01), 249-257 0026-3672 173:1-2<249 2011 173 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer