The result would be different. For if only 5ml instead of 10ml were measured, the salinity degree of the solution would be lower. It is possible to measure by a formula the concentration of solute and solvent contained in that amount of solution. C = M / V where C is the concentration, m is the mass of the solute and V is the volume of the solution.
The muck makes the wildfires even more dangerous because it is consisted of all kinds of things, materials. Lot of those materials are very flammable and have a big burning potential, can both start burning immediately, and burn long enough to spread the fire further, and make it bigger and much more dangerous.