Note that in Fig. 2a the data acquisition was continuous, necessary because the stop-start process of the data acquisition process adversely delayed the analysis through-put. Data acquisition was subsequently stopped and restarted only for each new sample of standard. The chromatographic analysis undertaken in Fig. 2a utilised a volumetric flow rate of 4.5 mL/min, with 0.9 mL/min being directed to the MS detector