How can anhydrous ammonia be checked for moisture? Is there any more direct method? Please, experts, give me some advice!
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I just arrived at the laboratory. The day before yesterday, the manager asked me to conduct tests and analyses on anhydrous ammonia, which is a raw material used by the company. I had never done this type of analysis before, so I prepared a testing standard for determining the ammonia content in anhydrous ammonia using the residue method. After reviewing it, they suggested that I also determine the moisture content in anhydrous ammonia. According to national standards, Karl Fischer titration is used for measuring moisture, but the necessary equipment is not available. Is it necessary to determine the moisture content in anhydrous ammonia? And how should it be done?
The water content in liquid ammonia should be an inspection parameter for liquid ammonia products, as it is related to the trade and application of liquid ammonia. Since there are standard methods for testing the water content in liquid ammonia, water analyzers can be purchased at a low cost; those used for measuring water content via Karl Fischer titration or Karl Fischer electrometric method are also not expensive.
Given the current situation of the poster, it is not possible to determine the moisture content accurately. The instrument still needs to be purchased, but the management will want to see the results, so they will surely find a way to resolve this issue. Here are two suggestions for the poster: 1. If your factory doesn’t have such an instrument, what about other factories? Look for something nearby that I can borrow. 2. If the instrument is not available and the supervisor still needs results, I have a workaround: increase the amount of liquid ammonia taken for sampling and allow it to evaporate in a fume hood. After evaporation, some liquid that does not evaporate will remain; this liquid is essentially ammonia water, which can be roughly considered water. The volume of this liquid can then be measured and used for calculations. (I have not tried this method myself; I am not sure how much liquid ammonia is required, and the evaporation time is likely to be quite long. The results obtained are only approximate, with significant errors.) The second suggestion is a last resort – I have not tested it personally; it is based on my own experience. If there are any mistakes, please feel free to point them out
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Thank you all for your answers. After talking with the boss, it’s okay to go with a purity level of that sort. It’s my first time doing this – does anyone have any experience to share?