Studies On Quantitative Detection Of Nano-titanium Dioxide Based On The Luminol-hydrogen Peroxide Chemiluminescence System

Extensive applications of nanomaterials have resulted in the release of nanoparticles into the environment, and the toxicity of nanomaterials has attracted wide attention at present. Developing the detection methods of nanomaterials can provide scientific data for safe assessment of nanomaterials, which is of great significance for the sustainable and healthy development of nanotechnology. Chemiluminescence analysis method has played an important role in analytical chemistry due to its high sensitivity, wide linear range, simple equipment, ease of automatization and rapid speed. In this paper, a novel simple method for direct quantitative determination of nano-titanium dioxide was developed based on the luminescent signal weakening effect of the luminol-hydrogen peroxide-cobalt ions chemiluminescence system in presence of nano-titanium dioxide.In chapter 1, the basic knowledge and the security of nanomaterials were reviewed, and then the common quantitative detection methods for nano titanium dioxide were summarized. The basic principle of the chemiluminescence analysis method and the common chemiluminescence systems were introduced. Finally, the purpose and design of this work were proposed.In chapter 2, the impact of nano titanium dioxide on luminol-hydrogen peroxide-cobalt ion system was studied, and a direct determination method of nano- titanium dioxide was established according to the light attenuation of nano-titanium dioxide to the luminol-hydrogen peroxide-cobalt ion system. The mechanism of the method was preliminarily explored. Key parameters governing the analytical performance of the system were investigated, including the species of metal ion catalysts, sequences of sample injection, flow rates, concentrations of cobalt ion solution, volumes of nano-titanium dioxide dispersion, pH values of cobalt ion solution, etc. Linear range of this approach was 0.025?0.25 g/L with a LOD of 1.0×10-3 g/L (3?) and a precision of 1.0% RSD (n=11) for the detection of 0.25 g/L nano-titanium dioxide dispersion under optimum experimental conditions. The recoveries of the nano-titanium dioxide in the lake water and the tap water were 93% ?108% and 92%?104%, respectively.In chapter 3, the new method for direct determination of nano titanium dioxide based on chemiluminescence system was summarized and predicted.