Application Of Derivative Flame Atomic Absorption Spectrometry Combined With Atom Trapping Technique For Analysis Trace Elements In Chinese Herbs

The trace metal elements in Chinese herbs have close correlation with the property of Chinese herbs. But the general analytical method can't meet the need for their low content. The atom trapping technique combined with the derivative flame atomic absorption spectrometry (D-FAAS) is a simple, precise, rapid and inexpensive method without complex pre-concentration. The application of derivative flame atomic absorption spectrometry (D-FAAS) using atom trapping technique for the determination of trace or ultra-trace elements in several kinds of Chinese herbs has been studied in this paper.This paper consists of five chapters. In chapter 1, the progress of the analysis of the trace elements in Chinese herbs is reviewed and the application of all kinds of analytical methods is introduced. The development of the application is prospected. Ninety-four references are cited.In chapter 2, D-AT-FAAS is described for the determination of trace copper. The conditions that affected on the absorbance, such as the trap position, the flame conditions, etc. are studied and the interruption test is discussed. The contents of Cu in Chinese herbs are determined using this method.In chapter 3, trace silver in several Chinese herbs (Radix Bupleuri, Rhizorna Cimicifugae etc.) is determined with D-AT-FAAS, and satisfactory results are obtained.In chapter 4, the optimized conditions are selected, and the trapping efficiency of quartz tubes of different i.d. is studied. Manganese in Some kinds of several Chinese herbs are successfully determined with the proposed method.In chapter 5, the operating conditions which influences the sensitivity anddetection limit are investigated and optimized. Nickel in several Chinese herbs is successfully analyzed using the proposed method with a recovery range of 90.7--105.2%.