Table 1. Summary table of methods used in this study.

Sample measurement time refers to measurements made during this study, with the upper end of the time range allowing for machine warm-up.

Method	Time lag to obtain results	Approx. sample measurement time	Approx. cost of equipment (USD in 2016)
VINDTA CT	Often long as samples are usually batch processed, often after the experiment	10–60 min	$75,000
Spectrophotometric pHT	Shortly after real-time	10–45 min	$3,000–10,000
Electrode pHNBS	Real-time	1–3 min	$1,000
NDIR CO2 equilibrator	Shortly after real-time (corresponding to equilibration time)	30–60 min	$4,000