This is working with DOM (dissolved organic matter) and in addition to the acid-base titration strategy, Follin's method, there is another strategy to determine the amount of phenolic?
Folin-Ciocalteu reagent acts on the phenols due to their reductive properties. Moreover, measuring absorption at 280 nm seems preferable to the Folin–Ciocalteu test, as it presents a number of advantages, including speed and reproducibility. However, certain molecules, such as cinnamic acids and chalcones, have no absorption maximum at this wavelength. Total phenolic content could be determined based on the characteristic absorption of the benzene cycles of the majority of phenols at 280 nm. A calibration curve in gallic acid with different concentrations can be performed to express the results. I hope it suits your type of analysis.
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