Selectively light scattering spectrometric detection of copper (II) based on a new synthesized oxamide ligand.
Light scattering (LS) signals have been applied for analytical detections, but the selectivity is poor. In order to improve the selectivity, pre-separation or new machines are generally considered. Differing from these methods, we synthesized a highly selective oxamide ligand, N',N'-bis (2-aminophenyl) oxamide (NAPO). It was found that the LS signals of NAPO, measured with a common spectrofluorometer, could be selectively enhanced by copper ion in neutral medium. Thus, a new highly selective detection method for copper ion could be developed over the range of 0.9-31.0 microM with the limit of determination of 97.6 nM (3sigma). Foreign ions including Cd(II), Al(III) could be allowed even if present at the level of 7-fold more than that of Cu(2+), avoiding pre-separation procedures from complicated samples such as real wastewater samples. Mechanism studies showed that the reaction between NAPO and copper ion could form some kinds of clusters and induce the enhanced LS signals.
Long
Yun Fei
YF
College of Chemistry and Chemical Engineering, Moe Key Laboratory on Luminescence and Real-Time Analysis, CQKL-LRTA, Southwest University, Chongqing 400715, China.
Huang
Cheng Zhi
CZ
He
Rong Xing
RX
Li
Yuan Fang
YF
D003300:Copper / Q000737:chemistry*; D008024:Ligands; D008027:Light; D010072:Oxamic Acid / Q000031:analogs & derivatives* / Q000032:analysis / Q000138:chemical synthesis; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence; D013054:Spectrophotometry, Atomic; D014867:Water / Q000737:chemistry
D008024:Ligands; C531584:N',N'-bis (2-aminophenyl) oxamide; D014867:Water; D003300:Copper; D010072:Oxamic Acid; C008728:oxamide