Microsoft Word - SOP - Hands-On Sessions

Rev. 1 - Final

STEP NUMBER

SAFETY AND HEALTH HAZARDS/ STEPS TO AVOID DEVIATION

DESCRIPTION

10

The boil off will take approximately 15 to 20 minutes using a water bath depending on the water temperature. If the flask is left in the air for boil off it could take up to an hour of course temperature dependant.

The water bath will become colder and colder so changing out the water will keep the vaporization more consistent rather than slowing as the water approaches freezing. Ice will form on the outside of the test tube and look like the tube is cracking but this is typically not the case.

11

As the flask contents either approach dryness or stops boiling a bare hand rubbing the flask measuring nipple for extra heat will drive off any remaining ammonia in the sample. The flask measuring nipple will then have your reading which typically reads between 0 and .5 which equates to 100 to 99.5% purity. If the level is above the nipple pour into a measuring cylinder for an accurate accounting. Remove the sampling stinger or hose from the service valve.

Do not sniff or drink.

12

14

Check for leaks and re-tighten all valves, plugs or caps.

Procedure : Testing R717 (Anhydrous Ammonia) for water content Reviewed: 10/26/2023

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