No abstract

Methods used for the determination of potassium content in potassium chlorate are mostly based on traditional chemical method, which is lengthy and cumbersome. If inductively coupled plasma emission spectrometry or atomic absorption spectrometry are used to determine the potassium with high content, the sample solution must be highly diluted, and it must produce errors in measurement and calling into question the reliability of the data. The method mentioned in this paper is about the determination of potassium content in potassium chlorate used for fireworks and firecrackers based on energy dispersive X-ray fluorescence spectrometry by controlling matrix effects between elements. Using sample solution of potassium chlorate in specific concentrates, the potassium content can be determined by the specific calibration curve established with an intensity calibration. This method can provide high accuracy and good precision in a short time with a simple process by efficiently controlling the matrix effects. It can fully meet the requirements for the determination of potassium in potassium chlorate used for different kinds of fireworks and firecrackers around the world, and it has good generalization and practicability. The average recovery of the method can be 97.37%99.63%, allowing for a difference of 0.5%. Introduction In China, fireworks and firecrackers are very important consumer recreational products in people's everyday life since ancient times. Gorgeous colors produced by fireworks and firecrackers are even the potassium ing role of foiling festal atmosphere in every grand holiday celebrations. In recent years, with the rapid development of global trade, fireworks and firecrackers are becoming more and more popular all over the world, more and more consumers are fascinatedby different kinds of patterns, pictures, and sound effects of fireworks and firecrackers. Potassium chlorate is the most popular chemical material used to be oxidant in fireworks and firecrackers.Quantitative analysis method of the potassium content reported in current literature is limited to traditional chemical analysis, such methods have the following disadvantages:(1) Long detecting period. Generally, it will take a skilled technician two whole days or so to complete the detection.(2) The operation is more complicated. It needs to go through many steps such as dissolving sample, filtration, precipitation collection, drying and weighing precipitation and ect. Comparing with traditional chemical analysis methods ,this method based on energy dispersive X-ray fluorescence spectrometry(EDXRF) has the advantages of simple operation steps, short period of detection, high accuracy and good precision. Theory Concept of the method: considering the weight of the sample is 1.0g,constant volume is 0.5L and the concentrations of the potassium would be controlled in 0.55g/L0.65g/L in sample solutions. And it can prove that when the potassium content in the solution is in the range of 0.16 g/L0.99g/L and the chlorine elements with the content of 0.18...

A rapid method for the simultaneous determination of trace elements in milk powder by energy-dispersive x-ray fluorescence has been developed. The measurement system consists of an Si(Li) detector, an x-ray tube coupled with zirconium as a secondary target excited source and a personal computer. Milk powder was analysed as pressed pellets and irradiated for lo00 s. Concentrations were determined by a fundamental parameters method. The detection limits are close to 1 ppm for most of the trace elements. The accuracy of the method was ascertained by analysing standard reference materials from the International Atomic Energy Agency. Good agreement was found between the certified and experimental values. Potential areas of applicability of the method are indicated,

A study of the physical and practical aspects needed for a successful solid solution method for XRF analysis is presented in the light of the theory and practice of the glass-making industry. An inexpensive manual glass disk sample preparation method is proposed that gives a well annealed disk that can he ground and polished without any losses due to breakage.

A radioisotope induced X-ray ,fluorescence method was used to measure rrace elements in Ming porcelain. Thirty pieces r!f'blue-and-white Chinese porcelain, belonging to the Ch 'eng Huu reign ( A D 1465-87) and rescuedfrom a shipwreck. were analysedulong with two,fake reproductions. The measurement system consisted of iln Si( Li) detector. u '"'Cd annular source and a personal computer with a non-linear,fitting least-square program. The relative intensity ratios oj' manganese, cohalt, rubidium, strontium, zirconium, and niobium were determined. RblSr and MnlCo ratios hetH,een tl.z'o to ,five rind ~M ' O to fbur respectir:ely correspond to antique porcelain.