. Author manuscript; available in PMC: 2011 Jun 3.

Published in final edited form as: Sens Actuators B Chem. 2010 Jun 3;147(2):714–722. doi: 10.1016/j.snb.2010.03.029

Table 1.

pK_a values and Stern-Volmer constants.^a)

	pK_a from Method A ^c)	pK_a from Method C ^c)	K_SV from Method B ^d)	K_SV from Method D ^d)
pH sensor only ^b)	7.04 (0.999)
Dual sensor ^b)	6.93 (0.998)	6.94 (0.996)	0.084 (0.997)	0.065 (0.999)
Oxygen senor only ^b)			0.074 (0.997)

^a)

Correlation coefficient (R²) in parentheses.

^b)

Experiments carried out at room temperature.

^c)

Experiments carried out in air-equilibrated buffers, corresponding to oxygen partial pressure of 21 kPa or [O₂] of 8.6 mg L^-1.

^d)

Experiments carried out at pH 7.5 and unit in kPa^-1.