Studies And Applications Of The Separation And Preconcentration Of Trace Pb,Cr,Cd With Nanometer-size Si-HAP And Determination By Atomic Spectrometry

On the basis of numerous references, through in-depth and systemic studied. According to nanometer-size Si-HAP has the nature high selectivity on recognition of metal ion, the synthesis of nanometer-size Si-HAP and its modified to prepare a type of adsorbent material which was applied to separate/enrich harmful metal ions. The separation and concentration behavior of Pb, Cd, Cr harmful ions with the functionality of materials had been studied respectively, and then new methods for analysis and determination by FAAS. The establishment of a efficient, simple, selective, responsive and usage reagents and there is no pollution of the amount of harmful metal ions analysis methods, At the same time, the field of nanometer-size Si-HAP applied was enlarged.The major contents include four parts, there are described as follows:1. The methods of separation/preconcentration and kinds of adsorption materials in atomic spectrometry determination were reviewed. The structure, characteristics and application in separation/preconcentration of new adsorption material nanometer-size Si-HAP were introduced in detail. And the nanometer-size Si-HAP and its modified used adsorbent for harmful metals ion concentration of the viewpoint.2. To adopt the Hydrothermal Synthesis of nanometer-size Si-HAP material has been studied on preconcentration and determination. A new method for the determination of trace Plumbum with nanometer-size Si-HAP separation/preconcentration by flame atomic absorption spectrometry determination was proposed. The adsorption theory, effect of pH,adsorption time, adsorption temperature, eluant, elution time and temperature, and interference ions of Plumbum on nanometer-size Si-HAP were studied. The detection limit of the method for Pb2+ was 1.33 ng/mL, the relative standard deviation was 4.0%, the linear range was 0.1~10μg/mL, the recovery in the range of 95.0%~102.5%. The method has been used to determination of trace Plumbum in water samples with satisfactory results.3. The adsorption characteristics of harmful element Cr morphological analysis on nanometer-size Si-HAP carried on rhodamine under dynamic condition were studied. It has establishing a new method for determination of trace chromium by FAAS. The linear range for chromium was 0.01~4μg/mL, A=0.13C+0.021(C:μg/mL, r=0.9994), detection limit(3σ, n=11) of this method for chromium was 0.10 ng/mL; and the relative standard deviation for chromium was 0.25%. The method has been applied for the determination of trace chromium in environmental water samples with s tisfactory results. The recovery was in the range of 94.0 % to 103.0%.4. A PTFE micro column packed with PMBP modified of nanometer-size Si-HAP as a new separation and enrichment material in flow injection (FI)-flame atomic adsorption spectrometry (FAAS) system for the determination of trace cadmium. The adsorption characteristics of cadmium on PMBP modified of nanometer-size Si-HAP under dynamic condition were studied, detection limit of this method for chromium was 0.28 ng/mL; the recovery was in the range of 96.0% to 104.2%. The method has been applied for the determination of trace cadmium in environmental water samples with satisfactory results.