After checking various online discussions I didn't come across any helpful details so decided to pose my question here instead. Supplies of that type of water look hard to come by in Sweden and the surrounding countries. The single result that showed up during my searches was from one particular site. I was considering beginning again by using precision pipettes but those would need sterilization via autoclave and handling inside a laminar flow setup. Following that the concentrated mixture must pass through a 0.1 micron PTFE membrane rather than a PES one since the strong solvent breaks down the latter.
Everyone's aware it's tough to find BAC lately. I saw that pure USP benzyl alcohol is sold online. Purchasing an entire container feels wasteful at first glance, given its limited applications otherwise. Preparing the 0.9 percent solution becomes straightforward with proper lab tools available. My job gives me lab access including precise measuring devices. Would this approach make sense?