Table 2: Relative changes of absorbance at 350 nm in spectra of PAA and PAA containing 1%, 3% and 5% of N-phenylbenzothioamide after different irradiation times.

Time of irradiation (minutes)	ΔA/A0 (350 nm)
	PAA	PAA + 1% thioamide	PAA + 3% thioamide	PAA + 5% thioamide
6	0.44	0.05	0.04	0.13
14	0.27	0.08	0.17	0.12
24	1.02	0.15	0.32	0.11
144	0.49	0.16	0.59	0.07
324	2.05	0.07	0.71	0.03
474	2.26	0.19	0.76	0.03
600	6.73	0.30	0.87	0.61