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Colorimetric determination of urea using diacetyl monoxime with strong acids

Fig 1

Urea samples after absorbance measurement.

Diacetyl monoxime and urea produce a pink-colored complex in the presence of ferric ions with a maximum absorbance at 520 nm proportional to urea concentration.

Fig 1

doi: https://doi.org/10.1371/journal.pone.0259760.g001