Molarity of reagent

N

A (mg CO2)

mg CO2 ml−1 1 M KOH

Calibration 1 (injection of Na2CO3)

0.5 M KOH

5

173.3 ± 1.4

34.7 ± 0.3

Calibration 2 (mixture of KOH and K2CO3)

0.05 M KOH + 0.025 M K2CO3

7

16.7 ± 0.6

33.4 ± 1.2

0.1 M KOH + 0.05 M K2CO3

6

34.0 ± 1.0

34.0 ± 1.0

0.5 M KOH + 0.25 M K2CO3

6

175.8 ± 1.6

35.2 ± 0.3