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- Sep 9, 2019
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How very interesting. I wish the full article was available, so that we could get acquainted with the methodology. I am assuming that they have found a way to do without a spectroscope: they are probably able to determine the nitrate content based on just two wavelengths (235 and 275nm), and are using a dye (Orange G) as a color filter. Very interesting approach, but there are many questions. In particular, Orange G is used as a pH indicator which changes color at pH 9. Their results must have been unstable depending on pH value (unless they are also adding a pH buffer to stabilize it). It would be also very interesting to look at the math they are using to extract the nitrate and nitrite values based on just two datapoints. Potentially, this is a very DIY-able project, can be something like a Hanna checker: take the sample, calibrate the device, add dye and buffer, read the result.