| Simultaneous detection of germanium and selenium from several officinal and edible natural products by inductively coupled plasma-mass spectrometry (ICP-MS) .It can provide scientific reference for the exploitation of Ge and Se-enriched natural products.Oven and microwave obturation digestion were compared. They both have merits of low acid consume (510mL),low environment pollution and high recoveries of volatile elements. Microwave obturation process only need 30 minutes. The change range of temperature is ±2 ℃.It can quickly digest, control temperature accurately and match to quick detection by ICP-MS Microwave obturation digestion and the three system of HNO3, HNO3/H2O2 , HNO3/H2O2/HF were used..This method have merits of low detection limits, little disturbance, wide linearity range. The range of detection of 28 elements was 0.0001390-4.185 ug/g. The spectrum line disturbance was lower by [m]/z+ qualify. The detection of one element only need 0.3-1.5s.The detection of one sample only need 70180s.It can detect Micro-elements (μg/L) and Macro-elements (mg/L) simultaneously and accuratelyApparatus semiconductor control temperature cooling pulverization chamber technique (2±0.1 ℃) and small aperture wimble (1.0/0.4 mm) was adopted to reduce disturbance. We tuned the parameters of apparatus, used injection-internal standard addition and disturbance correction equation to improve the accuracy of analytical results.The germanium and selenium were analysed by microwave obturation digestion/ICP-MS from teas, flowers, pollens, fruits and aloes. Germanium detection limits are in the range of 0.001696-0.001742 μg/g, with the relative standard deviation of 2.8%-6.9%,the recoveries are 88.3%119%. Selenium detection limits are in the range of 0.01437-0.02829 μg/g, with the relative standard deviation of 8.3%12%,the recoveries are 80.8%113%. The results show that the method is adapt to detect many kinds of element simultaneously. |
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