Determination of trace cadmium in sandstone type uranium ore samples by hydride generation inductively coupled plasma mass spectrometry
In sandstone type uranium ore samples,the cadmium content to be measured is low,and there are different types of mass spectra interference for each mass abundance.Moreover,the content of interfering elements also differs greatly,which brings significant challenges to the accurate measurement of trace cadmium using inductively coupled plasma mass spectrometry.In order to accurately measure the cadmium content in sandstone type uranium ore samples,it is necessary to overcome the different types of mass spectral interference in the samples.The hydride generation inductively coupled plasma mass spectrometry technique was used,in which the measured cadmium element was vaporized and measured in the mass spectrometer,which effectively overcame the issue of mass spectral interference for cadmium measurement and improve the sensitivity of cadmium.A method for accurately determining trace cadmium in sandstone type uranium ore samples using microwave digestion and continuous flow injection hydride generation-inductively coupled plasma mass spectrometry was established.Hydrochloric acid solution was used as the medium,and a thiourea-ferrocyanide masking solution was added.Ammonium dihydrogen phosphate and strontium ions were used as sensitizers.The selection and concentration of the medium,concentration of potassium borohydride,selection,and quantity of cadmium sensitizer were optimized,which effectively solved the problem of interference from coexisting ions.The method established for determining trace cadmium in sandstone type uranium ore samples using continuous flow injection hydride generation-inductively coupled plasma mass spectrometry has the characteristics of low detection limit,high accuracy,good precision,and wide applicability.The detection limit of the method is 0.001 µg·g-1,and the precision is better than 8.80%(characterized by the relative standard deviation RSD from multiple measurements).
sandstone type uranium ore samplestrace cadmiumhydride generationInductively coupled plasma mass spectrometrymass spectrometry interference
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