The Application Of Multi-walled Carbon Nanotubes Solid Phase Extraction Combined With High Performance Liquid Chromatography For The Detemination Of Organic Pollutions

In analytical chemistry, sample pre-treatment process directly influences the effectiveness of result.With the development of science and technology, simple, fast, green, efficient sample pre-treatmenttechnology was greatly concerned. Solid phase extraction using less organic solvents and with lesssecondary pollution, high enrichment factor, is an ideal sample preparation method. Carbon nanotube hasunique physical structure, good mechanical, optical and electrical properties and chemical properties.Moreover, its huge surface area is attracting the attention of the scientific community. Compared withtraditional fillers such as C8, C18, bonded silica, alumina, titanium dioxide nano-materials, carbonnanotube has a greater surface area and adsorption potential. Therefore, this article will focus onmulti-walled carbon nanotubes as a new type of solid-phase extraction sorbent materials for thepreconcentration of trace organic pollutants from water samples. In this paper, the proposed pretreatmentmethod coupling carbon nanotube with solid phase extraction has been applied to the analysisof organic pollutants in environmental water using high performance liquid chromatography-ultravioletdetection as instrumental technique with satisfactory results. Carbon nanotubes as a type ofsolid-phase extraction sorbent materials possess the great potential for enrichment of trace organicpollutants from water samples in sample pre-treatment process.This paper is divided into two parts including review report and research report. The first part of thepaper primarily discussed the development of carbon nanotubes in analytical chemistry field and otherapplication prospects. The second part of the study mainly consists of three experimental systems, namely(1) Carboxyl multi-walled carbon nanotubes solid-phase extraction combined with high performance liquidchromatography for the determination of melamine from environmental water samples;(2) Multi-walledcarbon nanotubes solid-phase extraction using high liquid chromatography for the determination of anilinecompounds from environmental water samples;(3) Multi-walled carbon nanotubes solid-phase extractioncombined with high performance liquid chromatography for the determination of triadimefon fromenvironmental water samples. 1. Carboxyl multi-walled carbon nanotubes (MWCNTs) solid-phase extraction combined with highperformance liquid chromatography (HPLC) for the determination of melamine from environmental watersamplesA simple and efficient method for the determination of melamine residues from environmental watersamples was developed using carboxyl multi-walled carbon nanotubes as solid-phase extraction sorbentmaterials combined with high performance liquid chromatography. In order to obtain the best experimentalconditions, several related parameters such as type and volume of elution solvent, flow rate of samplesolution, pH value of sample solution and the volume of sample solution were investigated in detail. Underoptimal conditions, the linear range of melamine was1-100μg L~"(-1)and the limit of detection (LOD) was0.3μg L~"(-1). The relative standard deviation was1.5%for six repeated determinations. Finally, the developedmethod was successfully applied to the determination of trace of melamine in environmental water samplesand the relative recoveries were obtained in the range of79.9%-98.1%.2. Multi-walled carbon nanotubes solid-phase extraction using high liquid chromatography for thedetermination of aniline compounds from environmental water samplesA sensitive and validated method for the determination of aniline compound residues in environmentalwater samples was developed using multi-walled carbon nanotubes solid phase extraction by highperformance liquid chromatography. The conditions of the extraction, SPE and HPLC were investigatedand optimized. Under optimal conditions, the linear ranges of aniline compounds were1-100μg L~"(-1),respectively. The limit of detections (LOD) were0.047μg L~"(-1)for m-nitroaniline and0.039μg L~"(-1)foro-nitroaniline. The relative standard deviations for six repeated determinations were2.5%, respectively.Finally, the proposed method was successfully applied to the determination of trace of aniline compoundsin environmental water samples and the relative recoveries were obtained in the range of85.2%-106%.3. Multi-walled carbon nanotubes solid-phase extraction combined with high performance liquidchromatography for the determination of triadimefon from environmental water samplesA new method for the determination of triadimefon residues in environmental water samples wasdeveloped using multi-walled carbon nanotubes solid phase extraction combined with high performanceliquid chromatography. In order to obtain the best experimental conditions, several related parametersincluding type and volume of elution solvent, flow rate of sample solution, pH value of sample solution, the volume of sample solution and etc. were investigated in detail. Under optimal conditions, the linear rangeof triadimefon was1-50μg L~"(-1)and the limit of detection (LOD) was0.037μg L~"(-1). The relative standarddeviation was2.78%for six repeated determinations. The developed method was successfully applied tothe determination of trace of triadimefon in environmental water samples and the relative recoveries wereobtained between95.0%-100.1%.