Interesting question though we all know the answer but it would be tough to put it in words and yes even I would be waiting for the answer to this question
The quantity depends on VS. You must first determine VS (mass fraction that escapes as a volatile substance when igniting the dry mass TS at 550 deg.C for 30 min) for the mixture and for the component of interest. Calculate how much is 0.5% (w/w), then find the mass of organic material.
The answer for this question will depend on your solution component. If you can provide more information about your solution, it will be easier to give you a specific answer