that's a screwy routine if you ask me. you work your arms on monday, then back the next day when your biceps are trying to recover, and are weakened.
if you want a higher frequency, great, how about a push pull split with legs involved both days.
so monday is push day: chest, triceps, shoulders, and quads
tuesday is a pull day: back, biceps, hamstrings, abs
take wednesday off, or do short cardio for your heart (or play a sport, or just take a day off

thursday is monday repeated, possibly with some different exercises
friday is like tuesday, again you can change a few exercises, or rotate between them on the alternating days.
sat/sun would be off days. you could also take wed/thurs off and workout fri/sat again if that works out better for you.
keep in mind that bulking is more about your diet than your routine. meaning, a solid routine and a crappy diet won't get you very far. for many, the only difference between a cut and a bulk is their diet...not how they train.