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The indophenol assay can only determine ammonia in the μM range. A: microtiter plate with varying concentrations of NH4Cl (0 mM to 1 M), which have been analyzed using the indophenol method. B: absorbance measurements at 650 nm for the different concentrations of NH4Cl (0 mM to 1 M). All measurements are the means of triplicates with error bars showing the standard deviation
