1.Hey , it's ez as 1-2-3...
1. just grab a single component standard solution for each of your three analytes; then inject each one singly so that you can discern their respective Tr (retention times);
2. then prepare an equi-molar mixture of the individual standards, then inject them. The Tr for the compounds in the mixture will match (w/n 0.2 mins) for their Tr as single analyte injects.
3. Lastly, inject your real test sample---then match the Tr of the peaks to the Tr of the STDs. Voila!