Hi guys,
I'm a Ph.D. Scholar in Physical Chemistry in Turkey and I'm becoming a Ph.D. soon.
I'm working on the adsorption of metal ions using various types of nanoparticles/nanocomposites.
I want to ask this question;
For instance we used the initial metal concentration C0 = 100 ppm,
We got the result of ICP-MS analysis Ce = 30 ppm and before we sent our sample to ICP analysis we diluted it 2 folds and our V/m value is 0,5, for instance.
I know Qe = (C0 - Ce)x V/m and we should consider Ce = 30 x 2 = 60 ppm, since it is diluted 2 folds. BUT, do I have to use Ce value as 30 ppm or 60 ppm when I'm building my adsorption isotherms? Qe = (100 - 60) x 0,5 = 20 mg/g but which Ce should I use for building my isotherms? 30 ppm or 60 ppm? If I remember correctly we were using Ce with dilution factor, I suppose I have to use 60 ppm as my Ce value here, but I wanted to make sure, so I require help now.
If you help me with this issue, I would be most grateful.
Best Regards.
H. Arkut Akalın
Remember that your Ce is based on the initial concentration Co therefore if your Co is 100 ppm and you diluted your sample before testing it on ICP then you must account for the dilution factor. You are saying you diluted it 2 folds, what was the initial amount interns of volume before you dilute and the amount after you diluted?
Hilmi Arkut Akalın : You are making a proper analysis for calculating Qe, you need to use 60 ppm for building the isotherm. Good look in your research!
Dear Hilmi Arkut Akalın
The adsorption isotherm is a curve obtained by plotting the extent of adsorption (amount of a substance adsorbed per unit mass of an adsorbent) against the "equilibrium pressure or concentration" at a constant temperature.
so in this case you should use 60 ppm instead of 30 ppm. usually, we dilute the solution just to be able to perform the analysis in cases where the concentrations used are outside the calibration curve of your metal solution then we multiply by the dilution factor.
Good luck with your Thesis.
#BAOUCH.Zakarya
Thank you all for your answers.
I have been working as a researcher in academy world since 2008 and becoming a Dr. in this academic term. Even though I'm a teacher in Physical/Nuclear Chemistry and very experienced, we all know even the most experienced may forget the fundamental terms because of hard working conditions.
Good luck with your scientific studies and sincere regards.
Hilmi Arkut Akalın
Ph.D. Scholar in Physical/Nuclear Chemistry