硫糖铝的检测方法.doc

硫糖铝中铝含量测定方法的研究 完成日期：____________________ 指导老师签字：____________________ 评阅老师签字：____________________ 答辩小组组长签字: ____________________ 辩小组成员签字：____________________ ____________________ ____________________ ____________________ ____________________ 摘 要 本旨在通过络合滴定和石墨炉原子吸收光谱检测硫糖铝中铝含量，并比较各种方法的优劣。络合滴定法是通过比较直接滴定和反滴定在作用下检测铝含量的大小来评价。本试验结果显示反滴定法，结果准确，更加适用石墨炉原子吸收光谱采用标准曲线，表明铝在2-25ng.mL-1范围内，吸光度与浓度呈良好的线性关系，回归方程A=0.0146x-0.0057，r2=0.9991。石墨炉原子吸收光谱操作简便快速，适合于样品同时检测但只适合用于微量铝含量，在转移过程易造成误差 Abstract This paper aimed to by EDTA (Ethylene Diamine Tetra Acetic Acid Disodium) complexometric titration method and graphite furnace atomic absorption spectroscopic method for detection of sucralfate in aluminum content, and compare the advantages and disadvantages of various methods. EDTA complexometric titration of aluminium content by direct comparison of titration and back titration with xylenol orange and dithizone indicator function detection to evaluate the size. The test results showed that xylenol orange on the determination of aluminum high sensitivity, EDTA back titration method, accurate results, more applicable. The standard curve method is used for the atomic absorption spectra of graphite furnace. The results showed that the absorbance and concentration of Al in the range of 2-25ng.mL-1 are linear with the concentration of the graphite furnace, and the regression equation A=0.0146x-0.0057, r2=0.9991. The atomic absorption spectrometry of graphite furnace is simple and fast, and can be used for many samples and time saving. But it is suitable for the detection of trace aluminum content, and the transfer process is easy to cause error, so it is not suitable for the precision measurement. Key words: sucralfate; EDTA complexometric titratin method; graphite furnace atomic absorption spectrometry