Direct Determination Of Trace Elements In Soil By Slurry-Sampling Atomic Spectrometry

Studied the slurry-sampling Graphite Furnace Atomic Absorption Spectrometry and hydride Generation Atomic Fluorescence Spectrometry building on the former documents. During the works of determinating the Pb,Cd in the soil by Slurry-Sampling Graphite Furnace Atomic Absorption Spectrometry, illustrated the matrix modifiers mechanism by apparent activation energy. And take the lead in determining the elements of As,Sb,Se by hydride Generation Atomic Fluorescence Spectrometry Method with Slurry-Sample.This paper includes three chapters.Chapter one: The advancement of Slurry-Sampling Atomic Spectrometry methodSummarized the technologies of Sampling, influencing factors of Slurry-Sampling and the evolvement in slurry-sampling AAS and HG-AFS.Chapter two: Direct Determination of Lead and Cadmium in Soil by Slurry-Sampling Graphite Furnace Atomic Absorption Spectrometry Using Matrix Modification TechniqueA method for direct determination of lead and cadmium in soil by slurry-sampling graphite furnace-atomic absorption spectrometry using NH₄H₂PO₄ as matrix modifier was developed. The effects of slurry stability, particle size of sample, matrix modifiers, ashing temperature, atomization temperature and common coexisting components on the signal intensity of lead and cadmium were investigated. The apparent activation energy of lead and cadmium was measured based on the linear relationship between the logarithm value of atomization peak time and atomization temperature. The mechanism of matrix modification was discussed. Under optimized conditions, the detection limit was 9.05×10^-1 ug L^-1 for Pb and 1.76×10^-2ug L^-1 for Cd. The recoveries were in the range of 91%-97% for Pb and 93%-109% for Cd. The relative standard deviations were in the range of 4.2%-7.8%.Chapter three: Direct Determination of Arsenic,Antimony and Selenium in Soil by ultrasonic-milled Slurry-Sampling with hydride Generation Atomic Fluorescence Spectrometry MethodA method for direct determination of Arsenic, Antimony and Selenium in soil by...