degradation behavior of ash of bark in which i am concerned with the degradation steps of ash mean which substance degrade first and then next.

What type of bark?

When you say degrade, I am assume you mean using Pyrolysis.

First determine what the bark is composed of? Each species of bark has different characteristics.

We use a spectrum analysis, and there are well over 200 components?

But when you say ash, it depends on the process you use, to creat the ash.

For you to find out, you'll have to hire it done.

thanks for replying first of all i made ash in furnance at 600 oC and then it is thermally degraded in thermal analyzer

Do you mean thermogravimetric analysis of ash?

Any test lab can perform this for you. If you pay them.

yeah exactly i m talking about TGA .i have performed this but its DTG is very complex and and for its description i am concerned about general composition of ash of any tree bark

okk thanks there is no other way except spectrum analysis?