It is easy to resolve this problem. In fact you have many methods to resolve this problem. First, You can use SEM-EDX to analysis. Second, you can use element nanalysis. Third, you can do XPS test. It can also anaylsis.
Sorry, I am not in China. I am in Germany. If you like, maybe I can send one E-mail to you after I go back my own flat after work. In my own flat, I can use Chinese input. I am sorry for the input problem.
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