Table 1.
THM concentrations [median (interquartile range)]a in environmental samples: tap water collected during showering and three integrated air samples (preexposure baseline, a time-integrated sample in the shower stall while the participant is showering, and a time-integrated sample to cover the 5-min postshower exposure period).
| Air (μg/mb)
|
||||
|---|---|---|---|---|
| THMc,d | Water (μg/L) | Preexposure baseline sample | 10-min integrated shower stall sample | 5-min integrated post-shower bathroom sample |
| Bromoform | 1.0 (0.4–1.5) | < LODe | 2.69 (1.46–4.13) | 2.69 (1.46–4.34) |
| Dibromochloromethane | 9.5 (6.2–13) | < LOD | 27.6 (20.5–38.8) | 29.5 (20.4–38.6) |
| Bromodichloromethane | 21 (18–24) | < LOD | 75.0 (59.1–86.2) | 78.7 (64.1–87.8) |
| Chloroform | 66 (56–72) | 1.31 (0.69–1.61) | 245 (212–279) | 248 (221–288) |
| Total THMs | 98 (91–102) | 1.31 (0.69–1.61) | 353 (314–394) | 362 (328–408) |
LOD, limit of detection.
Range is the 25th and 75th percentiles.
LOD for THM concentrations in air: bromoform, 2.1 μg/m3; dibromochloromethane, 1.7 μg/m3; bromodichloromethane, 1.3 μg/m3; chloroform, 0.98 μg/m3.
LOD for trihalomethanes in water: bromoform: 0.12 μg/L; dibromochloromethane: 0.24 μg/L; bromodichloromethane: 0.48 μg/L; chloroform: 0.92 μg/L.
When the concentration of an analyte was below the LOD, the concentration was replaced with the LOD/√2.
Except for chloroform, the THM concentrations in air were below the LOD. Only chloroform was included in the total THM value for air.