Please help

@crazychica Said

Ok, this is the same thing as yesterday, but I edited it a bit. One of my flatmates read it and thought it was good but I just need to make absolutely sure.

In this experiment, the optimum concentration of an acetonitrile and water mobile phase for the separation of a cortisone mixture using high performance liquid chromatography (HPLC) was determined. This was achieved by running a testosterone sample through an HPLC instrument at various concentrations of acetonitrile starting at 45% acetonitrile and finishing with 75%. The results were plotted in this graph (see appendix 1). The optimum concentration was determined to be 60%. The cortisone mixture was then separated using both a 75% concentration and the 60% concentration, proving 60% to be the optimum concentration.

@kentoo Said

Your statement the optimum concentration was determined to be 60% leaves concentration undefined. Am I correct by inferring that you could better describe that by saying the optimum concentration of acetonitrile mixture was determined to be 60%? Overall this provides more infromation than yesterdays offering. I gather that you are saying that the cortisone concentration of 60% is optimum and that the optimum concentration of Acetonitrile was 60% as well.