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. 2018 Dec 20;2:100023. doi: 10.1016/j.wroa.2018.100023

Fig. 2.

Fig. 2

Calibration curves of ammonium in artificial seawater. These calibrations were performed in spectrophotometric cuvettes. Grey squares represent a calibration without etidronic acid, black diamonds are for a calibration with etidronic acid. Wavelength: 690 nm.