微波消解-石墨炉原子吸收光谱法测定奶粉中镉铬铅

Determination of CAdmium,Chromium and Lead in Lycoris Radiata with Microwave Digestion Technique Furnace Atomic Absorption Spectrometry

采用微波消解技术处理样品,用石墨炉原子吸收光谱法测定,对消解的试剂和微波消解条件进行了筛选和优化,研究了石墨炉原子吸收的测定条件。研究表明,以HNO3+H2O2混合酸作为微波消解试剂效果最佳,在基体改进剂NH4H2PO4存在下,可有效地消除基体的影响,建立了微波溶样-原子吸收光谱法测定奶粉中Cd,Cr和Pb的方法,其Cd,Cr和Pb的测定检出限分别为0.0667,1.22和0.810μg/mL。将该方法应用于奶粉样品中Cd,Cr和Pb的测定,结果令人满意,RSD小于3.3%,回收率在93.8%～118%之间。

The microwave digestion technology treatment of samples, using graphite furnace atomic absorption spectrometric method for the determination of digestion, reagents and conditions of microwave digestion were screened and optimized, studied by graphite furnace atomic absorption determination conditions.Research shows that, HNO3＋H202 mixed acid as the best microwave digestion reagent, in the presence of NHnH2P04 matrix modifier, can effectively eliminate the matrix effect, established by microwave digestion - atomic absorption spectrometric method for the determination of milk powder in Cd, Cr and Pb method, the Cd, Cr and Pb determine the limits of detection were in 0.0667, 1.22 and 0.810μg/mL.This method is applied in the milk samples of Cd, Cr and Pb determination, satisfactory results, RSD is less than 3.1%, the recovery rate was 93.8%-118%.