| The toxicity and bioavailability of one element not only depend on itsconcentration but also depend on its speciation. The element with different specie hasquite different toxicity and bioavailability. Therefore, it is very important to analyzethe speciation of an element in the environmental and biological samples in hope forcrucial information to help us correctly evaluate its environmental risk.This thesis includes four chapters. The first chapter is a review on thecharacteristics of CE-ICP-MS and its predominance in the speciation analysis,sepecially in the speciation analysis of selenium, mercury and arsenic.In the second chapter, a new method for the separation analysis of Se(VI),Se(IV), SeCys2and SeMet by CE-ICP-MS was developed. The optimum conditionsof extracting each selenium compound in selenium-enriched rice were investigated indetail. Using the extraction method together with CE-ICP-MS, we have successfullydetermined the different species of selenium compounds in selenium-enriched ricesample with the detection limits of0.2-0.9ng Se/mL. Our results provided a simple,direct and sensitive analysis methed for the selenium compounds inselenium-enriched foods without complicated pretreatment.In the third chapter, a new method for the separation and determination of MeHg,EtHg and Hg(II) by CE-ICP-MS was developed. We have successfully determinedthe different species of mercury compounds in the MinJiang Rever water sample withthe detection limits of0.2-0.4ngHg/mL. The recoveries of the three mercury speciesin the water samples were in the range of94-104%. Our results provided a simple,direct and sensitive analysis methed for the mercury compounds in environmentalsamples.In the fourth chapter, the optimum conditions of extraction each arseniccompound in kelp sample was studied in detail. Using the method developed in thisstudy, we have successful determined the different species of arsenic in kelp samples, which were collected from Fujian province. |
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