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There are a number of expensive analytical techniques for measuring ammonium concentration, but I assume you're trying to find a cheap and easy way to estimate the concentration for a school project?
There's a white paper here which describes several ways that it's done. If it was me, I'd take a sample of hair dye and carefully dilute it by a known amount (say 100:1 or 1000:1; you may have to experiment) using deionized water. Then add a colorimetric indicator like indophenol blue to estimate the ammonium concentration in the diluted sample. Hopefully with a really diluted sample the color of the dye will be inconsequential. You'll then have to make up some samples with known ammonium concentration (by starting with a standard solution of known concentration - i.e. something other than hair dye - then diluting as necessary) until you can find a concentration which matches the color of your sample. Alternatively, if you can find the right indophenol blue home test kit, you may be able to compare the blueness of your sample to a hand-held color chart that tells you the concentration. If you've ever had a swimming pool or an aquarium, you may have seen similar test kits for chlorine measurement (only that's usually yellow, not blue). If you Google swimming pool ammonium test kit or aquarium ammonium test kit, you should be able to find a cheap source (or just go to your nearest pool or aquarium store and buy a cheap test kit). |
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Hey I use distilled water instead of deionized water because my teacher says they both are same and phenolphthalein instead of indophenol blue, and the diluted dye colour goes pink...
Its not working good, don't know what to do next.. How to know the concentration of ammonia in it ? Please reply fast.. Have to show teacher this project observation.. <3 |
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Phenolphthalein is a lot less specific than indophenol blue. It changes color in the presence of pretty much any acid or base. Still, that might be okay as long as the hair dye doesn't contain any other strong acids or bases.
Can you make up a sample of ammonium solution of known concentration, starting from a solution available in your classroom? If so, you could try diluting it a little at a time until the phenolphthalein no longer turns pink (and note what concentration that is). Then you could repeat the experiment using the hair dye until it also no longer turns pink, at which point the ammonium concentration should be the same as in the known sample. Then you just need to calculate the original concentration based on how much you diluted it. |
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