摘要
建立了微波消解—双道原子荧光光谱法同时测定大米中砷和汞含量的方法。通过试验优化了负高压、灯电流、载气流速、原子化器高度、载流酸度和硼氢化钾浓度等测试条件。砷、汞含量分别在1.0～100μg/L和0.1～10μg/L范围内与荧光强度呈良好的线性关系,线性相关系数均大于0.999 6,方法检出限分别为0.052,0.028μg/L,回收率分别为93.4～100.9,90.95～103.6,相对标准偏差均小于5%(n=6)。
A method was proposed for the simultaneous determination of As and Hg in rice by microwave digestion and hydride generation atomic fluorescence spectroscopy.Negative high pressure,lamp current,carrier gas rate,atomizer height,concentration of HCl and KBH4 in the determination of As and Hg were optimized.The results show that the linear range of As is 1.0～100μg/L with detection limit of 0.052μg/L,while the linear range of Hg is 0.1～10μg/L with detection limit of 0.028μg/L.Both the coefficients of correlation are more than 0.9996.The recoveries of As and Hg are 93.4～100.9%,90.95～103.6% respectively.The relative standard deviations of As and Hg detetion results are less than 5%（n=6）.
出处
《当代化工》
CAS
2013年第7期1021-1022,1032,共3页
Contemporary Chemical Industry
关键词
原子荧光光谱
微波消解
大米
砷
汞
Atomic fluorescence spectroscopy
Microwave digestion
Rice
As
Hg
