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Comparison between the results obtained by the two biosensors and the corresponding reference technique. Samples were collected from three different biogas plants (BP1, BP2, BP3) and spiked with 20 mM acetate, 5 mM propionate and 10 mM ethanol, formate, d- and l-lactate. For detection of ethanol, formate, d- and l-lactate a photometric reference technique was applied, and acetate and propionate were additionally quantified by gas chromatography.
