Study On The Trace Analysis And Speciation Analysis Of Metal Elements In Environmental And Biological System

Being at the forefront to the current international analytical chemistry, trace analysis and speciation analysis is important and practical to the studying and protecting environment. Sodium strontium was chose as the chemical modifier in the trace analysis of tin, which caused the highest allowable temperature enhanced obviously. The characteristic mass and detection limit was improved 45 and 51 folds. The mechanism of modification and atomization was explained with the results of scanning electron microscope and X-ray photoelectron spectroscopy and the binary alloy phase diagram of Sn-Sr. The direct determination of trace tin in water samples in the presence of Sr was reported for the first time. The proposed new method of slurry sampling technique combined with the Sr as modifier for the determination of tin in coal ash is sensitive and simple. A mathematical model for conventional hydride generation atomic absorption signal and a kinetic equation for derivative hydride generation atomic absorption single signal were established, respectively. The method for the direct determination of tin in mineral water and tap water was developed. The sensitivity of the proposed method was enhanced 43 times than that of the routine HG-AAS method. The highly sensitive system of Sn(FV) - cresolphthalexon(XO) - OP 10 was selected for the determination of tin by molecule absorption spectrometry. The color reaction was rapid, stable and sensitive. Six nutritional elements of Se, Ge, Zn, Fe, Cu, Mn in three kinds of Chinese herbal medicines were determined for the first time. The detecting methods of Mn in six kinds of Chinese herb medicine and Ge in the Lentinula Edodes and Ganoderma Lucidum were established separately. The relation between the concentrations of trace elementswith the pharmacological effects was discussed. An interface between short column gas chromatography with atomic absorption spectrometry was prepared. The combined instruments were applied to the separation and determination of methylmercury and mixture containing benzene, toluene, xylene, and ethyl benzene. It was developed from the determination results that absorbed mercury in human body could transformed to MejHg and MeHgCl. And the concentration of methylmercry was reduced in-order of blood cell, plasma, and urine. Based on the content data in the body of small mouse, the distribution of Hg in the body was obtained. The mercury was accumulated mostly in kidney. The CGC coupled with GFAAS technique was applied to the determination of the speciation of tetramethyltin. The effect of triphenyltin on Scenedeamus Obliquus was investigated. Scenedeamus Obliquus has a degradation effect on triphenyltin, and a growth rate of Scenedeamus Obliquus was negatively related with the concentration of triphenyltin while above 4 ug L-1.