Table 1.

Parameters for the simulation of eqs. (18)–(22) and (23)–(26)

	CO(NH2)2	NH3	${{\mathrm{NH}}_4}^{+}$	CO2	${{\mathrm{HCO}}_3}^{-}$	H+	OH−	${{\mathrm{HPO}}_4}^{2-}$	${\mathrm{H}}_2{{\mathrm{PO}}_4}^{-}$
$D_i^w$ (10−9 m2/s)	1.38	1.50	1.96	1.67	1.19	9.31	5.27	0.76	0.96
$c_i^{\infty }$ (mM)	$c_1^{\infty }$	0	0	0	0	$10^{-{\mathrm{pH}}^{\infty }}$	$K_w/10^{-{\mathrm{pH}}^{\infty }}$	$100/\left(1+\frac{c_6^{\infty }}{K{a}_5}\right)$	$\frac{c_6^{\infty }{c}_8^{\infty }}{K{a}_5}$
	Km = 23 mM	pKa2 = 9.25		pKa3 = 6.35		pKw = 14		pKa5 = 7.21

Diffusion coefficient and pK are extracted from ref. ⁶², urea-urease Michaelis-Menten constant from ref. ¹⁹.