Determination of 21 major and trace elements in soil and sediment by X-ray fluo-rescence spectrometry with ultra-fine powder pressing
A new method was established for the determination of 21 major trace elements in soil and sediment samples.The particle sizes of the soil and sediment samples were decreased to D90 lower than 30 μm within 5 min by ultra-fine grind to minimize the particle size effects,and the mineral composition of soil and sediment samples was relatively consistent before and after ultra-fine grind.Samples with moderate contents of elements were selected to optimize the measurement conditions,the absorption-enhancement effect between elements was corrected by the empirical coefficient and the RhKa scattering line internal standard,and the loss-on-ignition was used to normalize the testing data.The detection limit of this method was better than the fusion method(especially for light elements such as sodium and chlorine),the accuracy was significantly improved compared with the conventional powder pressing tableting,and the precision was less than 2%for the elements except chlorine and bromine.The present method can provide a promising tool for small amount analysis of precious samples and rapid green analysis of geological samples.
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