用火焰原子吸收光谱法测定熟地黄和车前子中6种金属元素的质量比

Determination of the Mass Ratios of 6 Microelements in Rehmannia glutinosa Libosch and Semen plantaginis by Flame Atomic Absorption Spectrometry

运用火焰原子吸收光谱法测定熟地黄和车前子中Cu,Zn,Fe,Mn,Ca,K的质量比.结果表明:用V(HNO3)∶V(HClO4)=4的混酸作消化液处理样品,在选定的实验条件下,各元素间互不干扰,可在一份样品液中进行6种元素的分别测定;熟地黄中各元素的质量比顺序为:K>Ca>Zn>Fe>Cu>Mn;车前子中各元素的质量比顺序为:K>Zn>Ca>Fe>Cu>Mn;RSD<2.40%(n=7),加标回收率为91.31%～106.87%.

The mass ratios of six microelements （Cu,Zn,Fe,Mn,Ca and K） in Rehmannia glutinosa Libosch and Semen plantaginis were determined by flame atomic absorption spectrometry with the mixed acid of HNO3-HClO4 （4 ：1） as the digesting solution. The optimal working conditions of the instruments used to determine the different elements were studied. The elements in these two sample solutions did not interfere with each other under the given experimental conditions,so the six elements can be examined in the same preparation solution. The results show that KCaZnFeCuMn in Rehmannia glutinosa Libosch and KZnCaFeCuMn in Semen plantaginis. The accuracy and precision of the method were examined. RSD2.40%（n=7）,the recovery is 91.31%～106.87% for these elements.