caa a22 4500 445880058 CHVBK 20180317145540.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00604-011-0679-z doi (NATIONALLICENCE)springer-10.1007/s00604-011-0679-z Determination of mercury(II) in water samples using dispersive liquid-liquid microextraction and back extraction along with capillary zone electrophoresis [Elektronische Daten] [Jinhua Li, Wenhui Lu, Jiping Ma, Lingxin Chen] We have developed a method for the determination of mercury in water samples that combines dispersive liquid-liquid microextraction (DLLME) with back-extraction (BE) and detection by capillary zone electrophoresis. DLLME is found to be a simple, cost-effective and rapid method for extraction and preconcentration. The BE procedure is based on the fact that the stability constant of the hydrophilic chelate of Hg(II) with L-cysteine is much larger than that of the respective complex with 1-(2-pyridylazo)-2-naphthol. Factors affecting complex formation and extraction efficiency (such as pH value, concentration of the chelating agent, time of ultrasonication and extraction, and type and quantity of disperser solvent) were optimized. Under the optimal conditions, the enrichment factor is 625, and the limit of detection is 0.62μgL−1. The calibration plot is linear in the range between 1 and 1,000μgL−1 (R 2 = 0.9991), and the relative standard deviation (RSD, for n = 6) is 4.1%. Recoveries were determined with tap water and seawater spiked at levels of 10 and 100μgL−1, respectively, and ranged from 86.6% to 95.1%, with corresponding RSDs of 3.95-5.90%. Figure A method was developed based on the combination of dispersive liquid-liquid microextraction with back-extraction showing simplicity, cost-effectiveness, and rapidity for remarkably enhanced preconcentration, and detection by capillary zone electrophoresis occupying high resolving power, rapidity, low-cost, and environmental benignity, and applied for highly selective determination of trace mercury in water samples. Springer-Verlag, 2011 Back extraction nationallicence Capillary zone electrophoresis nationallicence Dispersive liquid-liquid microextraction nationallicence Mercury nationallicence Water samples nationallicence Li Jinhua Key Laboratory of Coastal Zone Environmental Processes, CAS; Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003, Yantai, China aut Lu Wenhui Key Laboratory of Coastal Zone Environmental Processes, CAS; Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003, Yantai, China aut Ma Jiping Key Laboratory of Environmental Engineering of Shandong Province, Institute of Environment & Municipal Engineering, Qingdao Technological University, 266033, Qingdao, China aut Chen Lingxin Key Laboratory of Coastal Zone Environmental Processes, CAS; Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003, Yantai, China aut Microchimica Acta Springer Vienna 175/3-4(2011-12-01), 301-308 0026-3672 175:3-4<301 2011 175 604 https://doi.org/10.1007/s00604-011-0679-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-011-0679-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Jinhua Key Laboratory of Coastal Zone Environmental Processes, CAS; Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003, Yantai, China aut NATIONALLICENCE 700 1- Lu Wenhui Key Laboratory of Coastal Zone Environmental Processes, CAS; Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003, Yantai, China aut NATIONALLICENCE 700 1- Ma Jiping Key Laboratory of Environmental Engineering of Shandong Province, Institute of Environment & Municipal Engineering, Qingdao Technological University, 266033, Qingdao, China aut NATIONALLICENCE 700 1- Chen Lingxin Key Laboratory of Coastal Zone Environmental Processes, CAS; Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes; Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003, Yantai, China aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 175/3-4(2011-12-01), 301-308 0026-3672 175:3-4<301 2011 175 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer