Microwave Digestion Sample Hydride Generation-Atomic Fluorescence Spectrometry Determines Trace Selenium of Mogroside

0.2000g mogroside sample is digested by 7.0ml nitric acid and 3.0ml hydrogen peroxide, and generated by coprecipitation enrichment hydride - atomic fluorescence spectrometry determines trace selenium in it. Under optimum experiment conditions, a standard curve was produced using selenium standard solution, the linear equation is Ise=2890.6c＋0.0012,compared wish the linear relaticnship is not by coprecipitation direct determination of standard series Ise=82.56c＋0.0018 Selenium detection sensitivity was increased by 35.01 times,the correlation coefficient of obtained linear regression equation is 0.9996, the detection limit is 0.0012~tg/L and the relative standard deviation is 0.76% （n=5）. Containing 0.1808pg.g-1 Se Luo Han Shen samples. Based on mogroside sample, add a certain of standard solution to do recovery experiment, the obtained recovery rate is in 95.8%-103.6% and the result is satisfactory.

石墨炉原子吸收分光光度法测定胶囊剂囊壳及明胶空心胶囊中总铬含量

目的:采用石墨炉原子吸收分光光度法测定胶囊剂的囊壳及明胶空心胶囊中总铬含量。方法:采用不同条件的微波消解对胶囊剂及明胶空心胶囊壳进行前处理,在波长357.9 nm下,通过石墨炉程序升温进行测定。结果:方法线性良好;不同条件的微波消解,方法回收率均可达82%～94%。采用该方法对97批胶囊剂、52批明胶空心胶囊、6批明胶进行了总铬含量测定。结论:该方法适应性宽,可用于胶囊剂囊壳、明胶空心胶囊、明胶中总铬含量的测定。2种消解方法的测定结果基本一致。