A new method has been developed for separation and determination of zinc,copper,cobalt and nickel based on their colour chelates with 6,6″-dimethyl-4′-phenyl-2,2′:6′,2″-terpyridine（TPY） by ion pair high perform...A new method has been developed for separation and determination of zinc,copper,cobalt and nickel based on their colour chelates with 6,6″-dimethyl-4′-phenyl-2,2′:6′,2″-terpyridine（TPY） by ion pair high performance liquid chromatography in a reversed phase mode.The suitable conditions are the methanol-water（80:20,V/V） containing 10mmol/L NaH2PO4-H3PO4 buffer solution（pH=5.0） and 3.0mmol/L sodium dodecyl sulfonate as mobile phase,on a Symmetry C18 column（3.9mmID×150mm）,the flow rate of the mobile phase is 1.0mL/min.Spectrophotometric detection was made at 340nm.The detective limits are 0.05,0.10,2.00 and 0.50ng/mL respectively.The method has good selectivity and sensitivity.It has been applied to the separation and determination of zinc,copper,cobalt and nickel in human hair and tobacco and the result is satisfied.展开更多
Nano-particle Pd/?-Al2O3 monometallic and Pd-Cu/?-Al2O3 bimetall ic catalysts were prepared by solvated metal atom impregnation (SMAI) method. Th e results of XRD measurement indicated that Pd- Cu alloy was formed in ...Nano-particle Pd/?-Al2O3 monometallic and Pd-Cu/?-Al2O3 bimetall ic catalysts were prepared by solvated metal atom impregnation (SMAI) method. Th e results of XRD measurement indicated that Pd- Cu alloy was formed in the bim etallic catalysts and the crystalline particle size of the alloy increased as Cu contents increased with average diameters < 6.0nm for all the samples. XPS and Auger spectra showed that Pd was in zero- valent state, Cu existed mainly in z ero- valent state and partially in monovalent state Cu+. The Pd/?-Al2O3 and Pd-Cu/?-Al2O3 catalysts exhibited higher activity for CO oxidation at low temperature. The activity of Pd-Cu/?-Al2O3 bimetallic catalyst was hig her than that of Pd/?-Al2O3 monometallic catalyst. The Pd-Cu/?-Al2O3 c atalyst with Pd/Cu atomic ratio of 1∶1 showed the highest activity.展开更多
文摘A new method has been developed for separation and determination of zinc,copper,cobalt and nickel based on their colour chelates with 6,6″-dimethyl-4′-phenyl-2,2′:6′,2″-terpyridine（TPY） by ion pair high performance liquid chromatography in a reversed phase mode.The suitable conditions are the methanol-water（80:20,V/V） containing 10mmol/L NaH2PO4-H3PO4 buffer solution（pH=5.0） and 3.0mmol/L sodium dodecyl sulfonate as mobile phase,on a Symmetry C18 column（3.9mmID×150mm）,the flow rate of the mobile phase is 1.0mL/min.Spectrophotometric detection was made at 340nm.The detective limits are 0.05,0.10,2.00 and 0.50ng/mL respectively.The method has good selectivity and sensitivity.It has been applied to the separation and determination of zinc,copper,cobalt and nickel in human hair and tobacco and the result is satisfied.
文摘Nano-particle Pd/?-Al2O3 monometallic and Pd-Cu/?-Al2O3 bimetall ic catalysts were prepared by solvated metal atom impregnation (SMAI) method. Th e results of XRD measurement indicated that Pd- Cu alloy was formed in the bim etallic catalysts and the crystalline particle size of the alloy increased as Cu contents increased with average diameters < 6.0nm for all the samples. XPS and Auger spectra showed that Pd was in zero- valent state, Cu existed mainly in z ero- valent state and partially in monovalent state Cu+. The Pd/?-Al2O3 and Pd-Cu/?-Al2O3 catalysts exhibited higher activity for CO oxidation at low temperature. The activity of Pd-Cu/?-Al2O3 bimetallic catalyst was hig her than that of Pd/?-Al2O3 monometallic catalyst. The Pd-Cu/?-Al2O3 c atalyst with Pd/Cu atomic ratio of 1∶1 showed the highest activity.
