Table 2.

Comparison of the half-lives (h) of PAH degradation on various substrates under illumination.

	This studya	Pennise and Kamensb	Behymer and Hitesc				Matsuzawa et al.d			Wang et al.e	Niu et al.f
	Soot	Combusted wood chip	Silica gel	Alumina	Fly ash	Carbon black	DPM	Soil components	DPM/soil mix	Pine needles	Fly ash
Naph	44-220 (3.4-36)									10.7
Acy	23-32 (0.9-1.9)		0.7	2.2	44	170				27.7	76
Ace	21-50 (1.3-1.9)		2	2.2	44					33.0	89
Flu	21-28 (1.3-3.9)		110	62	37	>1000				39.8	90
Phe	16-33 (3.6-3.7)		150	45	49	>1000	4-61	1-5	9.1	34.5	112
Ant	14-41 (3.9-4.4)		2.9	0.5	48	310				22.4	81
Flt	16-120	1-17	74	23	44	>1000	11-22	1.6-4.2	6.5	21.5	154
Pyr	15-92	0.75-7.8	21	31	46	>1000	9-734	0.8-1.6	10.2	21.9	95
BaA	5.9-180	0.8-12.4	4	2	38	650				20.6	139
Chry	110-130*	0.8-12.4	100	78	38	690	12-405	1.7-8.8	8.4	27.0
BbF	84-126*	0.66-7								37.7	198
BkF	54-84*	0.66-7								28.3	248
BaP	42-280	0.11-5.7	4.7	1.4	31	570	1.6-6.6	<0.5-1.6	6.2	33.5	178
Ind	210-1200*	0.34-7.6								41.3	182
DaA		0.35-6								37.1	198
BgP	100-160*	0.31-10	7	22	29	>1000				44.1	169

^aValues are for three different soot loadings (first phase decay half-lives in parentheses, illuminated with 1000 W xenon lamp).

^bExposed to natural sunlight in Pittsboro, NC.

^c450 W medium pressure Hg lamp used.

^d300 and 900 W xenon lamp used, DPM: diesel particulate matter.

^eExposed to natural sunlight in Dalian, China.

^fIlluminated with simulated sunlight.

^*Values for 12.7mg soot were not included due to R² less than 0.9.