Application of Single-Wall Carbon Nanotubes for Elemental Speciation
|School||Wuhan Polytechnic University|
|Keywords||Morphological analysis Single-walled carbon nanotubes Solid Phase Extraction Separation and enrichment Inductively Coupled Plasma Mass|
The traditional methods of chemical analysis usually only the determination of the total amount or total concentration of the analyte in the sample, which can not meet the needs of the development of the science and technology. The physiological activity of the elements and biological toxicity is closely related to its existing form element speciation analysis for the evaluation of different forms of the biological function of the elements and their compounds and toxicological effects. For trace element speciation analysis, pre-enrichment were measured and then the high sensitivity of the detection equipment. Solid-phase extraction is commonly used as a separation and enrichment technology, compared with the traditional liquid - liquid extraction, with different detection techniques combined with simple operation, good selectivity and less consumption of organic solvents, high enrichment factor, easy and can be repeated enrichment materials, has been widely used in the sample preparation. The adsorption material selection plays an important role in the solid-phase extraction is directly related to the sensitivity and selectivity of the method. Therefore, the search for new adsorption material has been a hot issue in the analysis in the field of scientific research. Nanomaterials are subject to extensive attention in recent years, a kind of new functional materials, has a new series of different physical and chemical properties. Such as: having a high specific surface area, surface energy and surface binding energy. Separation and Enrichment of the carbon nanotube diameter is larger than the surface area, the surface of the carbon atom adjacent atoms is missing, showing strong adsorption activity of many metal ion has a strong adsorption capacity, the analysis of trace elements is preferable material. Inductively coupled plasma mass spectrometry (ICP-MS) as a trace and ultra-trace element analysis technology, with a low detection limit, high precision, wide dynamic range, simultaneous multi-element determination, etc., has been widely used environment, geology, medicine, new materials and other fields. The purpose of this study is that single-walled carbon nanotubes (SWNTs) for solid phase adsorption material, using ICP-MS as a means of detection, systematic study of the adsorption properties of SWNTs different valence states of arsenic, manganese, chromium three elements, The main factors and its regularity, and established method for morphological analysis of real samples related elements. The main research contents are summarized as follows: (1) SWNTs as solid-phase extraction adsorbent material, ICP-MS detection means of the SWNTs adsorption behavior of As (III) and As (V) in the presence of APDC, examines the impact of The adsorption of the main factors, the establishment of a separation and determination of As (III) and As (V), and to establish the method is applied to the analysis of real samples of As (III) and As (V). (2) SWNTs adsorption material, ICP-MS detection means to explore the adsorption behavior of SWNTs Mn (II) and Mn (VII) The effects of pH, sample flow rate, eluent and coexisting ions adsorption the main factors and established methods for environmental water samples Mn (II), Mn (VII) and the determination of the total amount of Mn. (3) SWNTs separation and enrichment materials, micro-column separation and enrichment of ICP-MS with a more systematic study of the adsorption behavior of SWNTs on Cr (III) and Cr (VI), The effects of the pH, eluent the main factors affecting the adsorption and coexistence ions, and established method for the analysis of real samples of Cr (III) and Cr (VI).