Depends ...
If ur hitting a good bicep lift and then back the next day ur back lifting could suffer.. Because u get biceps secondary on back days same goes for tri and chest
Lots of guys hit some lifts like this and wonder why they don't grow it's because eventually they are working the triceps snd bicep so much thought the week hitting the isolation one day but with secondary Work on other big muscle days
my current split monday-sunday is
quads/calves
chest
back
hamstrings/calves
shoulders
arms
active recovery/cardio
i always give arms their own day becauase i think they need it to do them properly. whenever ive just tacked some tris at the end of a chest workout or bis at the end of a back workout it never quite hits the spot like smashing them by themselves for an hour
im doing them tomorrow and my workout is going to be as follows if youre interested:
wide grip (hands outside shoulder) barbell curls/ incline bench skullcrushers
narrow grip ez bar curls/ tricep extension rice machine
dumbbell hammer curls/ overhead dumbbell extension
single arm standing cable curl/ tricep rope extension
machine preacher curl/ cable tricep push down
all superset with high rep/moderate weight.
just my 2c! good luck! EDIT: huge pump from this too!!!