I am getting different wt % of Pt and Ni in my sample (rGO-PtNi) by SEM-EDX and ICP-MS. By ICP-MS I am getting higher ratio what will be the reason for this discrepancy. Thanks
Both methods for good quantification require solid knowledge of techniques and are prone to errors. In addition quantification with EDX is very difficult when specimen has large amount of light elements in its composition (like graphene oxide); in this case I would rather believe ICP-MS results. And what "ratio" means? Pt/Ni ratio? it should be more reliable than wt%.
Dear Mohammad
Actually, EDS analysis is not an exact quantitative method especially for light elements. Also the results of EDS analysis is dependent to the micro structure of sample. The non homogen distribution of an element may results in different results of analysis.
If your sample is compound containing O, H, C, SEM/EDX will give incorrect result because, SEM/EDX gives semi-quantitative result. ICP-MS is most reliable equipment for quantification actual percentage, if you have right procedure for solving your sample.
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