Simultaneous determination of 11 trace elements in coal by inductively coupled plasma-optical emission spectrometry

To quickly determine microelements of coal in batch,the coal sample was ashed first at high temperature,then the product was dissolved by the mixture of HCl,HF and HCl O4,the third step was to extract the microelements with HCl. The microelements which were Ga,Th,V,P,Cu,Co,Ni,Zn,Pb,Cr,Cd were determined with ICP- OES( Inductively Coupled Plasma- Optical Emission Spectrometry).With reasonable sample dissolution methods,radio- frequency power,analytical spectral line and experimental data,the influence of spectral interference on determination was eliminated by off- peak background deduction method,meanwhile,the 11 kinds of microelements could be determined by ICP- OES at the same time. The detection limits for the elements was 0. 03 ~ 1. 17 μg / g. The method was applied to the determination of 11 microelements in Soil National Standard Reference Materials and the results were in agreement with certified values with precision of 0. 32% ~ 3. 19% RSD( n = 11).