The analysis index of the portable metal analyzer for trace heavy metals in natural water based on anodic stripping voltammetry (ASV) were performed. Simultaneous determination and monovariated analysis of trace heavy metals were investigated both subsequently. The reasons of disturbance in analysis were also discussed. The addition of Ga (II) was testified that can eliminate the formation of the Cu-Zn intermetallic compound.
A novel ion-imprinted organic-inorganic hybrid sorbent was synthesized and characterized by FT-IR and nitrogen gas adsorption-desorption. The adsorption property and selective recognition ability of the imprinted sorbents for the lead ion were studied. Results showed that the uptake capacities and selectivity coefficients of the double imprinted sorbent were much higher than that of the non-imprinted sorbent. The adsorption capacity of the double imprinted sorbent is 545.6 mg•g-1. The largest relative selectivity coefficient between Pb (II) and Cd (II) was 192. This results suggested that the new sorbent can be used as effective solid-phase material for the selective preconcentration and separation of Pb (II) in environmental water samples.
The performance of various noble metal based catalysts for the NOxreduction in the CO-rich conditions of simulated post Euro-IV diesel emissions at low temperature was investigated in this paper. Pd loaded catalyst showed higher catalytic activity than Ir or Rh loaded catalysts. Titania, as one of the support material, clearly promoted the deNOxprocess due to the synergy with alumina and Palladium. The TiO2loading was optimized subsequently. As a result, Pd/TiO2/Al2O3catalyst with Pd loading of 2.0 wt.% and TiO2loading of 10 wt.% showed the NOxconversions of 25~46% in the temperature range of 200~250°C.
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