Adding noise to theoretical breakthrought cirves

[annaand]

Hello everybody..
I want to add some noise to my theoretical breakthrough curves. Adding white noise is very simple, but I cannot understand how can you can add some pink (flicker) noise or brown one?
Any ideas?
anna

[AdrianF]

Could you explain your question in different terms? I for one have no idea what the question means. How does it relate to HPLC?

[annaand]

Ok, there is the case:
I try to evaluate chromatographic methods (FA, FACP, PM) of adsorption isotherm determination - thoroughly theoretical work. I calculate breakthrough curves (by mean of Equilibrium Dispersive model + model of adsorption e.g.Langmuir), and then I determine isotherms. Then I fit these isotherms and I calculate errors of determined best-fit parameters and the ones that I introduced in ED model. While calculating band profiles I have pure beautiful breakthrough curves. To make it more realistic, I want to add noise to band profiles and then determine errors. Noise has to have normal distribution. One of the way is to add 'white noise'. But I found that while analyzing experimental breakthrough curves Felinger found that the noise is more complicated called flicker or pink, and brown noise as well.
The question is the same:
How to add pink and brown noise to curves?
Anna

[Uwe Neue]

The simplest approach to get realistic noise is to make a real measurement and overlay the measurement to your simulation (been there, done that)...