Investigations On The Ultraviolet Vapor Generation Atomic Fluorescence Spectrometric Determination Of Species Of Inorganic Arsenic And Inorganic Lead

With the development of technology, the natural environment is continuously changed by more and more human activities of living and production. It is true that human has made remarkable achievement in the industrial revolution. At the same time, due to the mismanagement of industrial waste and irrational exploitation of natural resources, many serious environment problems which are difficult to cure have been appeared subsequently. Among them, water pollution has already been posed a serious threat to not only ecological system but also social and economic development, and what is more, a major danger for the health of human beings. Therefore, it is significantly important that to establish a method that is the rapid, simple and selective for monitoring and controlling the quality of water.In this thesis, ultraviolet light induced chemical vapor generation (UVG) method was studied and has achieved satisfactory results on determining tap water, lake water and pond water. The method is simple, rapid and validated by determination of certified reference water sample.The first section of this paper focused on the introduction of the phylogeny and mechanism of UVG method. Furthermore, the application of UVG method in the fields of food, environment and pharmaceutical analysis was introduced briefly. In addition, development status of determination method for inorganic arsenic speciation analysis and inorganic lead was also presented roughly.In the second section, the properties of inorganic arsenic were investigated, and a method for determination of species of inorganic arsenic was proposed. The experiment for quantification of As(V) and As(III) respectively was conducted on the basis of the corresponding signals obtained by adjusting the irradiation time of ultraviolet light coupled formula derivation. Under the optimal experimental conditions, the linear response ranges for the determination of inorganic arsenic and As(Ⅲ) were 2.8～1.0×103 and 1.7～8.0×103μg L-1 respectively. The detection limits were 0.94 and 0.56μg L-1 for inorganic arsenic and As(III), and their relative standard deviations (RSD) for 11 repeated measurements were 3.4% and 3.2% respectively. The established method has successfully applied to the speciation of inorganic arsenic in tap water, lake water and pond water samples without any pretreatment procedure.In the third section, UVG method was described for determination of inorganic lead in tap water, lake water and pond water. The experiment was carried out on account of alkylation reaction between inorganic lead and low weight molecule organic acid with UV light irradiation. Under the optimal experimental conditions, the fluorescence intensity is proportional to the mass concentration of inorganic lead in the range of 2.3～5.0×10μg L-1, and the detection limit for this method was 0.76μg L-1. The RSD obtained from 11 replicate measurements of 50μ,g L-1 inorganic lead standard solution was 1.4%. The percentage of recovery for the determination of practical samples was 92.0%～98.3%.The fourth section made a brief summary on the established method concerning content and analysis characteristics of the experiment.