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Studies and Applications of the Separation and Preconcentration of Trace Pb、Cr、Cd with Nanometer-size Si-HAP and Determination by Atomic Spectrometry

Author: RenHongYing
Tutor: ZhouFangQin
School: Xiangtan University
Course: Analytical Chemistry
Keywords: Nano- Si - HAP Separation and enrichment Flow Injection Flame atomic absorption spectrometry Lead Chromium Cadmium
CLC: O657.31
Type: Master's thesis
Year: 2010
Downloads: 106
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Abstract


This paper is based on access to a large number of Chinese and foreign literature, the use of the nano silicon hydroxyapatite (Si-HAP) of metal ions with high recognition and selectivity to synthesize a new type of nano-Si-HAP and its change sexual function of separation and enrichment materials. Atomic absorption spectrometry as a means of testing this new functional separation and enrichment materials separation and enrichment of detection of harmful metal elements such as lead, chromium, cadmium, thereby establishing efficient, simple, sensitive and selective , reagent consumption and environmental pollution harmful trace metal ions separation and analysis of new ways to expand the application of nano-Si-HAP and its modified compounds in the field of analytical chemistry. The paper is divided into four chapters, the main contents are as follows: Chapter 1: a synthesis of recent years separated the determination of the enrichment and separation and enrichment research progress. Focuses on new adsorbent materials - structure, properties and synthesis of nano-Si-HAP, and its enrichment and separation applications, the nano-Si-HAP and its modified materials as adsorbents, ion of harmful metals enrichment and separation The set of views. Chapter 2: hydrothermal synthesis of nano-Si-HAP, and as the separation and enrichment materials by flame atomic absorption method for testing means, the establishment of a new method for determination of trace amounts of harmful metals lead, of the adsorption pH value, adsorption time, the adsorption temperature, the eluent, the elution temperature and time, factors such as interfering ions of lead ions adsorbed on the nano Si-HAP. The method for the detection of lead limit of 1.33 ng / mL, the relative standard deviation was 4.0%, the linear range 0.1μg/mL 10μg/mL recoveries were 95.0% -102.5%, and its success applied to the determination of trace lead in environmental water samples. Chapter 3: rhodanine load in nano-Si-HAP surface modification of nanomaterials, and as an adsorbent material, the use of flame atomic absorption spectrometry testing means, a detailed study of the load Rhodanine nano-Si-HAP separation and enrichment of trace amounts of harmful metals chromium behavior under dynamic conditions, morphological analysis. Thereby establish a new method for determination of trace chromium. The method of linear range was 0.01 ~ 4μg/mL; linear regression equation A = 0.13C 0.021 (C: microg / mL, r = 0.9994); detection limit (3σ, n = 11) was 0.10 ng / mL; relative standard deviation 0.25%, and the recovery in the range of 94.0% to 103.0%. The method is applied to the determination of trace chromium in environmental water samples with satisfactory results. Chapter 4: Load 1 - phenyl-3 - methyl-4 - benzoyl - pyrazolone (PMBP) nano-Si-HAP as the separation of cadmium enrichment of new materials, homemade filled PTFE micro-column, and then into the FI flow path by flame atomic absorption spectrometry as a means of detection, the systematic study of the the PMBP load under dynamic conditions nano-Si-HAP on harmful trace elements cadmium adsorption performance, affecting cadmium online adsorption and elution The main factors were studied in detail. The detection limit was 0.28 ng / mL spiked recoveries in the range of 96.0% to 104.2%, the method used in the actual environmental water samples for determination of cadmium of harmful trace metal elements with satisfactory results.

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CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Photochemical analysis ( spectral analysis method) > Atomic emission spectrometry
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