Determination of Fe and Zn in Four Pregnant Drug by Microwave Digestion-Flame Atomic Absorption Spectrometry

The new method for determination of trace elements Fe and Zn in four pregnant drug was investigated.High-pressure microwave digestion-flame atomic absorption spectrometry was used to determine the contents of trace elements Fe and Zn in four pregnant drug including Huai yam,Huai chrysanthemum,Huai Rehmannia,Huai achyranthes.The regression equation of Fe was y=0.0968x + 0.0114,r = 0.9995(n= 6),the linear range of 0—6.4μg/mL,average recoveries were from 91.29%to 101.06%with RSD of 1.334%—4.314%.Fe contents in the samples were between 159.091μg/g and 1535.64μg/g.The regression equation of Zn was y=0.4207x+0.0039,r=0.9996 (n= 6),linear range was in the range of 0—1.2μg/mL,average recoveries ranged 93.58%—100.85%with RSD of 1.145%—3.634%.Zn contents in samples were 43.571—70.357μg/g. Microwave digestion is used to digest samples with time-saving,simple,economies,complete digestion and less pollution,and can be used to determined trace elements in pregnant drug.