[milka]

Hello.
I am trying to differentiate between these techniques and their applications. I have an example of a process and am trying to select the most suitable technique. For example, in the measurement of aromatic organic compounds in aqueous process stream which one of these would be most suitable? I would go with Raman since is not afected by water interfering with the spectra and the Raman bands are high intensity for organic molecules. However, all the options look suitable to me    I would appreciate any suggestions on this as I am very confused.
Thanks in advance!

[Corribus]

It's hard to address your question because it is rather vague. But some of your reasoning seems to be based on wrong information. For example, water is not Raman silent. Also, Raman bands are never high intensity, except for rare cases like SERS.

[marquis]

This is the point where you start to have instrument salesman do some work for you.

First, the instrument companies often have publications on related work.  He may
be able to point you to the right internet sight or give you a copy.  They usually
also have applications people who can help you out.

If an instrument salesman thinks you will buy and instrument, he will be happy to
have someone at the plant do a feasibility study for you.  Don't get me wrong, you
will still have plenty of work to do, but he may be able to get you on the right track.

And you can have all of the different instrument salesman(say IR, NIR, and/or raman)
do the same thing for you.

Good luck.