Table 2.

Evaluation of cumulative dissolution of BaSO₄ in flow cells with pH 4.5 media using flow-through or flow-by methodology.

	M0	Mion/T	${\mathit{t}}_{1/2}$	${\mathit{k}}_{\mathit{diss}}$	${\mathit{t}\prime }_{1/2}^{}$	${\mathit{b}}_{\mathit{diss}}$
		[µg/d]	[d]	[ng/cm²/h]	[d]	[%/d]
Flow-through, PSF pH4.5	0.17 mg	17.5	2.6	44.7	1.6	43.3
	1 mg	51.1	5.9	10.3	6.8	10.2
	10 mg	53.6	72.1	0.9	78	0.89
	50 mg	58.0	247	0.2	346	0.2
Flow-by, EU pH4.5	0.08 mg	3.9	5	13.8	5.6	12.4
	0.8 mg	13.7	28.9	3.4	25.7	2.7
	8 mg	14.7	72.2	0.32	53.3	1.3

The half-times ${\mathit{t}\prime }_{1/2}^{}$ are obtained from b_diss by direct fitting of the decay curve on a semi-log plot using Eq. (2a), whereas the half-times ${\mathit{t}}_{1/2}$ are derived via conversion of the cumulative rate k by Eq. (2b).