Table 5.

Comparison of normalized CHCl₃ and BDCM concentrations in tap water, during-shower air, and postshower breath from THM exposure studies.

	THM concentrationa
Target matrix	CHCl3	BDCM
Mean water concentration (μg/L)b
May et al. (1995)c	55	17
Kerger et al. (2000)d	47	42
Egorov et al. (2003)	198	6.7
This study	82.8	20.3
Mean normalized during-shower air concentration (μg/m3 per μg/L)e
May et al. (1995)c	1.72	1.54
Kerger et al. (2000)d	3.52	1.91
Egorov et al. (2003)	1.67	1.25
This study	2.23 ± 0.18	1.91 ± 0.23
Mean normalized postshower breath concentration (μg/m3 per μg/L)f
May et al. (1995)c	NA	NA
Kerger et al. (2000)d	NA	NA
Egorov et al. (2003)	0.54	0.12
This study	0.15 ± 0.01	0.07 ± 0.02

NA, not analyzed.

^aIn water source, bromoform was near or below LOD at most sites; in air samples, DBCM and bromoform were < LODs in Egorov et al. (2003) and May et al. (1995) studies; in breath samples, DBCM and bromoform were < LODs in Egorov et al. (2003) study and this study.

^bn = 44 in May et al. (1995) study; n = 20 for source water and n = 12 for shower air in Kerger et al. (2000) study; n = 14 for source water, n = 35 for shower air, and n = 9 for exhaled breath in Egorov et al. (2003) study; and n = 6 for source water, shower air, and exhaled breath in this study.

^cData for mean values for CHCl₃ and BDCM for source water and shower air estimated from plots in May et al. (1995).

^dAir concentration data obtained by Kerger et al. (2000) from eight unvented and four vented shower events. In vented events, either the bathroom exhaust fan was on or the bathroom window was opened during the sampling event. The bathroom door was shut for all shower sampling events.

^eShower duration: May et al. (1995) reported 10 min; Kerger et al. (2000) reported 6.8 min and 12 min; Egorov et al. (2003) reported 15–20 min; this study, 10 min.

^fBreath sample collection: Egorov et al. (2003) reported ≤1 min postexposure; this study, 5 min postexposure.