Recent content by ACvub

sorry for the delay. here is the file with the absorbance for both glasses.

Yes, my data are absorbance as a function of wavelength. NOw I don't have access to the hard drive where data data are. I will post the raw data later on today so you can have a look. thank you again!

they both vary with wavelength. In the 2-equations system I have attached to my first thread, the unknowns are the two extinction coefficients.

Nobody has an idea on what's wrong?

I am sorry chemisttree, maybe I hadn't explain well myself. I didn't want to be disrespectful. I have tried to use your advice. But I don't see how. Substituting ferric concentration with the subtraction of ferrous from total iron concentration, the final solution remain unchanged. I...

the unknown variable are the ε for the two ionic species. so adding the mass balance equation does not add any value.

You are right! I understand. But even if I substitute CFe3+ with (CFetotal - CFe2+), I don't see how it would solve the problem. At the end it is always the same value.

Thank you chemisttree for replying. However, I don't get what you mean. How can I solve in terms of total Fe? In the system I have the concentrations of the two absorbing species: Fe3+ (CFe3+) and Fe2+ (CFe2+) Where should total Fe appear in the equations?

Hello everybody, I want to determine the extinction coefficients of Fe2+ and Fe3+ in glass. There are literature data (e.g. Weyl's book "coloured glass"), so I know what kind of curves I should expect. As I am studying a slightly different soda-lime-silicate system, I want to recalculate the...