Determination of 8 elements in spodumene by inductively coupled plasma atomic emission spectrometry with alkali fusion
Calcium,magnesium,iron,silicon,aluminum,manganese,beryllium and phosphorus in spodu-mene are determined by the series of methods 3,4,5,6,7,8 and 10 in industrial standard YS/T 509-2008 of Methods for chemical analysis of spodumene and lepidolite concentrates.The results are accurate,but there are many kinds of reagents used and the process is complicated.After the spodumene sample was treated by alkali fusion with sodium hydroxide at 630 ℃ for 15 min,it was acidified and leached with hy-drochloric acid(1+3).By selecting the optimal analytical lines of elements,the contents of calcium,mag-nesium,iron,silicon,aluminum,manganese,beryllium and phosphorus in spodumene were determined by inductively coupled plasma atomic emission spectrometry(ICP-AES).The calibration curve was drawn by matrix matching method to eliminate the influence of matrix effect.The linear correlation coefficients of calibration curves for elements were all higher than 0.999 7.The limits of quantification of elements were between 0.061 5 μg/g and 123.9 μg/g.The contents of calcium,magnesium,iron,silicon,aluminum,manganese,beryllium and phosphorus in two spodumene samples were determined according to the pro-posed method,and the relative standard deviations(RSD,n=7 or n=8)of determination results were all less than 2.5％.The contents of calcium,magnesium,iron,silicon,aluminum,manganese,beryllium and phosphorus in certified reference material of spodumene were determined according to the proposed method.The relative errors(RE)of determination results were between-5.00％and 7.31％.
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