Studies On Speciation And Distribution Of Trace Elements In Cropper And Chinese Herbs

A method, hydride generation atomic fluorescence spectrometry, for the determination of trace elements places more and more role in many fields, for its low detection limit, high sensitivity and simultaneously detected many elements. This paper focuses on the application of hydride generation atomic fluorescence spectrometry in determination of arsenic, selenium, tin and antimony in Chinese herbs and cropper. The paper consists of four chapters.In chapter 1, the fundamental principle, history and the application progress of atomic fluorescence spectrometry are reviewed .with 50 references.In Chapter 2, A new method was developed for simultaneous determination of trace arsenic and antimony in water and Chinese herbal medicines by hydride generation-atomic fluorescence spectrometry with L-cysteine as the prereductant. A Soxhlet extraction system and a n-octanol-water extraction system were employed for speciation analysis and research of As and Se in Chinese herbs.In Chapter 3, a new method was developed for simultaneous determination of trace arsenic and selenium in lycium barbarum L. by hydride generation atomic fluorescence spectrometry, with hydrochloric hydroxylamine as the prereductant. A ultrasonic extraction was employed for the speciation and distribution of arsenic and selenium.In chapter 4, a new method is developed for the determination of trace tin in soil by hydride generation fluorescence spectrometry with sodium dodecanesulfonate (SDS) as the sensitizing reagent, the concentration and distribution of trace tin in soil-paddy system was investigated.