Table 5.

Concentrations of MTBE and its breakdown products in air and in the aqueous phase. The percentage corresponds with the MTBE concentration in headspace related to the mass initially added

		Ambient headspace				Aqueous phase
	Time	C9–C11 cyclic	MTBE	TBF	Acetone	MTBE	Acetone	Methyl-ethyl-ketone
		(mg m−3)	(mg m−3)	(mg m−3)	(mg m−3)	(μg L−1)	(mg L−1)	(mg L−1)
5 M H2O2+20 mM Fe(III)2SO4	15 min	< 0.3	120 (5 %)	10	< 1
	1 h	< 0.3	94 (4 %)	14	< 1
	4 h	< 0.3	1.8 (0.1 %)	1.9	< 1
	20 h					< 0.5		< 0.05
5 M H2O2	15 min	< 0.3	430 (18 %)	< 0.6	< 1
	1 h	< 0.3	320 (13 %)	< 0.6	< 1
	4 h	< 0.3	160 (7 %)	1.6	< 1
	20 h	< 0.3	7.6 (0.3 %)	2.8	1.9	8.8		0.10
Control	15 min	0	160 (7 %)	< 0.6	< 1
	1 h	0	240 (10 %)	< 0.6	< 1
	4 h	2.9	290 (12 %)	< 0.6	< 1
	20 h					7700		< 0.05