>Swim wishes to hear opinion on whether use of thick walled plastic bottle filled 1/3 full
>and duct taped will suffice as adequate short term storage unit. Container will be kept
>in icewater slurry until ready to use.
Ice/water can only chill a container to about -10C in SWIM's experience (yes, SWIM knows it's possible to get it colder with CaCl2/water but not cold enough). This is going to be a serious problem for you! The BP of ammonia is -33C. You do not want to put liquid ammonia into a bath that is able to boil off the ammonia! You must think this through thoroughly!
You should be using a dry-ice/acetone bath to temporarily store the liquid ammonia... if you're not able to reach this temperature, you should be using a styrofoam container or dewar flask to temporarily store the liquid, and you must realize that this shit will fume like hell as it evaporates.
The answer to your question depends on how fast the ammonia comes through the valve, and how efficiently your condenser is able to chill the liquid ammonia