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Sketch of the flow-through setup (not true to scale). The fluid used is 0.01 M NaCl solution which is flown through the system with 0.27–0.28 mL/s. A peristaltic pump is used to maintain the flow rate. The tracers are injected through a septum upstream of the column. The column is packed with quartz sand. Produced fluids are measured in a flow-through quartz cuvette in the spectrometer and are wasted afterwards (i.e. not reinjected).
