Not really no. Typically, what's done is a small portion is left aside for certain tests, such as this one. Also, if you will have an unknown anion, make sure it isn't one of the anions you've added for cation determination. Even if you're sure, you should always keep some aside, as you add reagents, you dilute the unknown. At some point, you will have a large volume of liquid. Also, you should still stick to your addition procedure, because, in the case of multiple ions, you want to remove some so they don't react at the next steps.
You've also missed a very easy QA test for 3 of your ions. Not that that's all that important, your procedure is well streamlined for your suspected cations. Just wanted to make you look and see it, so you know there's something else out there, if you get a different set, some other time.