微波消解-石墨炉原子吸收光谱法测定蔬菜中痕量钼  

GF-AAS Determination of Traces of molybdenum in Vegetables with Microwave Assisted Sample Digestion

作　　者：高彩[1] 李雪[1] 屈中华[1] 张静[1] 于日壮 戴文[1] 徐文军[1] 

机构地区：[1]临沂大学化学化工学院,山东临沂276005

出　　处：《福建分析测试》2016年第5期24-28,共5页Fujian Analysis & Testing

基　　金：2015年国家级大学生创新创业训练计划项目资助(201510452008)

摘　　要：建立了微波消解-石墨炉原子吸收光谱法测定蔬菜样品中的痕量钼。通过密闭高压、微波消解样品来制备样品溶液,研究了不同基体改进剂及其用量对吸光度的影响;采用氘灯背景扣除,313.3 nm作为钼的测定波长,3μL 1 g·L^(-1)磷酸二氢铵为基体改进剂,灰化温度为1000℃;原子化温度为2800℃。在该实验条件下,方法的线性范围为0~200μg·L^(-1),相关系数r=0.9997,检出限为3.6μg·L^(-1),测定样品的相对偏差为0.50~2.1%,回收率为92.8%~102.4%。该法灵敏快速,准确度高,适用于蔬菜等植物样品中痕量钼的测定。Trace molybdenum in the vegetable samples were determined by microwave-digestion-graphite furnace atom- ic absorption spectrometry method with deuterium lamp for the background absorption deduction and （NH4）2HPO4 （3 μL 1 g·L^-1） as matrix modifier. The sample solution were prepared by closed pressured and microwave digested tech- nique and the influences of different matrix modifiers and their dosage on absorbency were discussed. In the determination, the wavelength of determination was 313.3 nm. The ashing temperature and the atomization temperature was 1000 ℃ and 2800 ℃, respectively. Under this test condition, the linear range was 0-200 μg · L^-1 and the correlation coefficient was 0.9997. The detection limits was 3.6μg · L^-1. Relative deviation of sample determination was 0.50-2.1%, and the recovery rate was 92.8%-102.4%. The method is sensitive ,accurate and suitable for the determination of trace molybdenum in vege- tables.

关 键 词：微波消解 石墨炉原子吸收 基体改进剂 测定 钼 

分 类 号：O657.31[理学—分析化学]