A simple and reproducible method for the rapid extraction and determination of trace amounts of copper（Ⅱ） ions using octadecyl-bonded silica membrane disks modified by N,N′-disalicylideneethylenediamine （DESDA） ...A simple and reproducible method for the rapid extraction and determination of trace amounts of copper（Ⅱ） ions using octadecyl-bonded silica membrane disks modified by N,N′-disalicylideneethylenediamine （DESDA） and atomic absorption spectrometry was presented. The method is based on complex formation on the surface of the ENVI-18 DISK^TM disks followed by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution is efficient and quantitative. The effects of potential interfering ions, pH, ligand amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break-through volume was found to about be 1000 mL providing a preconcentration factor of 500. The maximum capacity of the disks was found to be （389±4） μg for Cu^2＋. The limit of detection of the proposed method is 5 ng per liter. The method was applied to the extraction and recovery of copper in different water samples.展开更多
The title complex was obtained by reaction of hydrated neodymium(Ⅲ) nitrate with N,N-disalicyclideneethylenediamine in DMSO. The complex [Nd(C_6H_4OHCHNC_2H_4NCHC_6H_4OH)(NO_3)_3(CH_3SOCH_3)] crystallizes in monoclin...The title complex was obtained by reaction of hydrated neodymium(Ⅲ) nitrate with N,N-disalicyclideneethylenediamine in DMSO. The complex [Nd(C_6H_4OHCHNC_2H_4NCHC_6H_4OH)(NO_3)_3(CH_3SOCH_3)] crystallizes in monoclinic system, space group- P2_1/n, a=9.663(2), b=16.610(6),c=16.322(5),β=102.77(2)°,V=2555(3),M_r=676.71,Z=4,Dx=1.759 gcm-3. The coordination number of Nd(Ⅲ) is 9 with the geometry of a monocapped square antiprism.All of coordination atoms are oxygen atoms from three bidentate nitrate groups, two dischiff base molecules and one DMSO molecule.展开更多
文摘A simple and reproducible method for the rapid extraction and determination of trace amounts of copper（Ⅱ） ions using octadecyl-bonded silica membrane disks modified by N,N′-disalicylideneethylenediamine （DESDA） and atomic absorption spectrometry was presented. The method is based on complex formation on the surface of the ENVI-18 DISK^TM disks followed by stripping of the retained species by minimum amounts of appropriate organic solvents. The elution is efficient and quantitative. The effects of potential interfering ions, pH, ligand amount, stripping solvent, and sample flow rate were also investigated. Under the optimal experimental conditions, the break-through volume was found to about be 1000 mL providing a preconcentration factor of 500. The maximum capacity of the disks was found to be （389±4） μg for Cu^2＋. The limit of detection of the proposed method is 5 ng per liter. The method was applied to the extraction and recovery of copper in different water samples.
文摘The title complex was obtained by reaction of hydrated neodymium(Ⅲ) nitrate with N,N-disalicyclideneethylenediamine in DMSO. The complex [Nd(C_6H_4OHCHNC_2H_4NCHC_6H_4OH)(NO_3)_3(CH_3SOCH_3)] crystallizes in monoclinic system, space group- P2_1/n, a=9.663(2), b=16.610(6),c=16.322(5),β=102.77(2)°,V=2555(3),M_r=676.71,Z=4,Dx=1.759 gcm-3. The coordination number of Nd(Ⅲ) is 9 with the geometry of a monocapped square antiprism.All of coordination atoms are oxygen atoms from three bidentate nitrate groups, two dischiff base molecules and one DMSO molecule.
