微波消解-火焰原子吸收法测定新疆野蔷薇果中金属元素

Determination of Trace Metal Elements in Fruits of Rosa multiflora Thunb Using Microwave Digestion Followed by Flame Atomic Absorption Spectrophotometry

采用HNO3消解体系对野蔷薇果进行程序升温微波消解制样,应用火焰原子吸收法测定野蔷薇果中的Ca、K、Mn、Zn、Mg、Fe、Cu、Na、Cr、Ni、Sr共11种金属元素的含量。对样品前处理条件进行筛选,确定样品适合的微波消解体系并进行消化结果的准确度和精密度实验。该方法的加标回收率为96.50%～104.50%,相对标准偏差(RSD)≤3.21%。结果表明,新疆野蔷薇果中富含Ca、Mg、K、Na、Mn、Fe等对人体有益的金属元素,而Cr、Ni等金属元素的含量较低。

A flame atomic absorption spectrophotometric（FAAS） method based on microwave digestion was proposed for the determination of 11 trace metal elements（Ca,K,Mn,Zn,Mg,Fe,Cu,Na,Cr,Ni and Sr） in the fruits of Rosa multiflora Thunb grown in Xinjiang autonomous region.Temperature programmed rise was used for the microwave digestion of samples.The optimal digestion solvent was nitric acid.The proposed method exhibited good accuracy and precision.Spike recoveries of 11 trace metal elements in a real sample were within the range of 96.50%-104.50%,with relative standard deviations（RSDs） of no more than 3.21%.Actual determinations demonstrate that the fruits of Rosa multiflora Thunb grown in Xinjiang autonomous region are rich in Ca,Mg,K,Na,Mn and Fe beneficial for health and contain small amounts of Cr and Ni.