Determination of 6 Elements in Geochemical Sample by Inductively Coupled Plasma Mass Spectrometry with High Pressure Sealed Digestion
A method for determination of 6 elements,including boron,cobalt,molybdenum,cadmium,germanium,and beryllium,in geochemical sample by inductively coupled plasma mass spectrometry(ICP-MS)with high pressure sealed digestion was proposed.0.100 0 g of the sample was taken into a polytetrafluoroethylene crucible,and 3 mL of 50%aqua regia(a mixture of hydrochloric acid-nitric acid-water at a volume ratio of 3∶1∶4)and 0.5 mL of hydrofluoric acid were added,settling for 30 min.Then the mixture was performed by high pressure digestion in a 180℃oven for 18 h.After digestion,its volume was made up to 50 mL with water,in which 6 elements were determined by ICP-MS.As shown by the results,linear relationships between the corresponding spectral peak intensity and internal standard spectral peak intensity ratios and mass concentrations were found within 200 μg·L-1 for boron and cobalt elements and 10.0 μg·L-1 for molybdenum,cadmium,germanium,and beryllium elements,with detection limits(3s)of 0.005-0.12 mg·kg-1.The method was used to analyze national standard materials,and the determined values were basically consistent with the certified values,with RSDs(n=12)of the determined values less than 8.0%.The method was also used to analyze two actual geochemical samples,and the determined results were basically consistent with those by DZ/T 0279-2016,with RSDs(n=12)less than 5.0%.
high pressure sealed digestioninductively coupled plasma mass spectrometry(ICP-MS)geochemical sampleelement
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