Electrochemical And X Fluorescence Analytical Methods To Detect The Trace Metal Elements In Some Systems

Metal elements are the important part in nature, part of the metal element is also the necessary elements to maintain normal growing development and metabolism of the organisms life. But when life elements maintain a higher concentration in organisms, it also can produce significant harm to the physiological functions of organisms, especially the toxic heavy metals are more harmful. Now there are numerous analytical detection methods at home and abroad, this study is based on different sample pretreatment, using solid ion selective electrode, XRF and ICP-MS to dectect heavy metals and rare earth metal elements for different samples, in order to build new sample detection methods and achieve a lower detection limit.This paper consists of four parts:The first part:Simple introduced the different sample pretreatment methods and detection methods; the research significance of detect heavy metals and rare earth elements are reviewed in this paper and the advantage of different detection methods.The second part:Solid ion selective electrode was used to detect heavy metals such as lead and cadmium. To join a new type of conductive polymers(DH-6T) into the ion selective electrode membrane solution, the element detection limit is5.6x10"9mol/L, and greatly improve the stability of the solid ion selective electrode, reduce the potential response time, one step drop the selective membrane solution method could reduce the chances of the hydration layer appears.The third part:Using ICP-MS analysis technology to detect the rare earth elements content of different samples in orchard which is after using rare earth micronutrient fertilizer. The highest content of rare earth elements in the samples only4.75ug/g, as achieving the purpose to increase the apple quality after using rare earth micronutrient fertilizer, the residue of rare earth micronutrient fertilizer did not achieve the pollution level. Using PMBP/n-butyl acetate in the buffer (pH=5), with sulfosalicylic acid and ammonium thiocyanate as masking agent to extract part of the rare earth elements, Reverse extraction with1:10hydrochloric acid, cobalt as internal standard, using XRF analyzer for quantitative analysis of each kind of rare earth elements.The forth part:Using XRF to analyse the content and distribution of trace elements for different samples of apple peel and pulp, results proved that the trace element content and distribution has a huge difference in the apple peel and pulp for different areas, although in the same area that after rare earth micronutrient fertilizer of the content of trace elements in apple with ordinary also has obvious differences. Preliminary studied the effect of rare earth micronutrient fertilizer on shape and taste of apple, laid a certain foundation for further research.