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How come I am unable to read high concentrations of ammonium on my AquaFluor with a cuvette? Why do I need to use the minicells?
Due to the optical configuration for the AquaFluor ammonium channel large volumes of highly concentrated samples over-saturate the sensor.  Rather than reducing the sensitivity and linear range of the optics by adding an attenuator plate, we advise using the smaller volume minicells that achieve these limits.  Readings on the ammonium channel using plastic cuvettes have a maximum range of approximately 10 µM, whereas minicells are required to achieve maximum range readings of >10 to100 µM.  Turner Designs now includes a minicell adapter and minicells with your order of an AquaFluor with an ammonium channel.