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Who uses a flame test?

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Who uses a flame test?

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Flame tests are a quick method to find something out. In the laboratory, time is money, and you do not always need expensive equipment and a test that takes an hour to obtain very important information. In my lab, I can quickly determine whether a chlorinated polymer is present in quite small amounts, using a variant of the Beilstein test. In this test, a copper wire is heated in a Bunsen flame until the end forms a small bead, and then this is pressed against the edge of the sample, while holding the sample close to the air inlet of the Bunsen. In this way, the vapour from the hot copper is drawn into the gas stream and thereby into the flame. If there is halogen there (i.e. normally chlorine), a green colour is visible in the flame. The method does not suffer from interference by sodium (yellow), which is often present on the copper or the sample.

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