Consider the following chromatographic data for the separation of methylparaben from ethylparaben in a sunscreen sample. A compound not retained by the column in this analysis had a t_(m) of 0.75 minutes. What is the purpose of this analysis?
1) To determine the concentration of methylparaben in the sunscreen sample
2) To determine the concentration of ethylparaben in the sunscreen sample
3) To determine the retention time of the compound not retained by the column
4) To determine the separation efficiency of the column