Buy Indigo™ phenolphthalein test papers for fast, inexpensive ammonia gas leak detection. Ammonia changes phenolphthalein paper from white to pink at pH 11.6. Only $2.95 for 100 strips.
Find ammonia gas leaks by wetting one end of the test paper with water and then holding it near the suspected leak. If the color change is immediate, get a protective mask with an air supply.
If you need a supersensitive detector for gloveboxes, click on ammonia leak detector cloth. Or, if you need a semiquantitative measurement for use in bioreactors or waste management, click on 0-100ppm ammonia test strips.
Phenolphthalein is itself a weak acid and colorless when dissolved in distilled water. When a basic (alkaline) compound such as ammonia is added, the increase in pH alters its chemical structure and changes the color of the solution to pink/fuchsia. This is a simple test for ammonia gas using litmus paper.
monia has uses as a refrigerant & for leak detection techniques but it is also used in water treatment. Some municipalities use it to react with chlorine to produce choramines. These have a lower overall disinfection strength but last much longer.
Phenolphthalein strips can detect ammonia in air since its pH of 11.6 turns phenolphthalein a pink/fuchsia color. The test strip has to be wetted first so the ammonia gas can dissolve onto the wet strip. This test for ammonia gas using litmus paper is strictly qualitative, i.e. yes or no.
Test Strip Documentation
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