Table 2.

Model input parameters and estimates of toluene, o-xylene and PCE diffusivities in HDPE and PVC.

			isotherm parameters						diffusion coefficienta
			tolueneb		o-xyleneb		PCEc		toluene	o-xylene	PCE
material	particle density (g cm–3)	mean particle diameter (µm)	K	nd	K	nd	K	nd	D	D	D
HDPE	0.962	500	70.7e	1.0	244.1	1.0	385	1.0	3.13 × 10–10	2.20 × 10–10	1.42 × 10–10
PVC	1.4	140	1663f	0.864	4634	0.718	2951	0.918	4.33 × 10–13	4.22 × 10–14	1.50 × 10–14

^acm² s⁻¹.

^bValues from Wu et al. (2001).

^cValues from Wagner (2003).

^dDimensionless Freundlich exponent.

^eK_p for HDPE (µg kg⁻¹)(l µg⁻¹).

^fK_f for PVC (µg kg⁻¹)(l µg⁻¹)ⁿ.