Table 6.

Comparison of THM concentrations in source water, during-shower air, and postshower breath concentrations in this and other published studies.

	Source water concentration (μg/L)					During-shower air concentration (μg/m3)a					Postshower breath concentration (μg/m3)b
THM compound	May et al. 1995c	Kerger et al. 2000	Egorov et al. 2003	Present study		May et al. 1995c	Kerger et al. 2000	Egorov et al. 2003	Present study		May et al. 1995c	Kerger et al. 2000	Egorov et al. 2003	Present study
				High site	Low site				High site	Low site				High site	Low site
CHCl3	51	47	198	148	28	84	165	330	318	67	—	—	110	24	6
CHBrCl2	17	42	7	33	11	24	80	8	54	23	—	—	1	6	3
CHBr2Cl	6	31	1	6	2	ND	16	ND	9	4	—	—	ND	1	1

ND, not determined. Kerger et al. (2000) and Egorov et al. (2003) reported mean concentrations; May et al. (1995) reported median concentrations; we report median concentrations from Tables 2, 4, and 5. n = 44 in May et al. study; n = 20 for source water and n = 12 for shower air in Kerger et al. study; n = 14 for source water, n = 35 for shower air, and n = 9 for exhaled breath in Egorov et al. study; n = 4 and 3 for source water, shower air, and exhaled breath at the high (NC) and low (TX) sites, respectively, in the present study. In water source, CHBr₃ was near or below limit of detection at most sites; in air samples, CHBr₂Cl and CHBr₃ were below limits of detection in Egorov et al. and May et al. studies; in breath samples, CHBr₂Cl and CHBr₃ were below limits of detection in Egorov et al. and the present study.

^aShower duration: May et al. reported 10 min; Kerger et al. reported 6.8 min and 12 min; Egorov et al. reported 15–20 min; we report 10 min.

^bBreath sample collection time: Egorov et al. reported ≤ 1 min postexposure; we report 5 min postexposure.

^cMedian values for CHCl₃, CHBrCl₂, and CHBr₂Cl for source water and shower air estimated from plots in May et al.