Points are colored by altitude, (a) Acetone (C[H.sub.3]COC[H.sub.3]) and (b) acetonitrile (C[H.sub.3]CN) were measured by TOGA, and (c)
bromoform (CH[Br.sub.3]) and (d) dibromomethane (C[H.sub.2][Br.sub.2]) were measured by AWAS.
The toxicity of trihalomethanes (chloroform, bromodichloromethane, dibromochloromethane, and
bromoform) is widely discussed [60-67], but their usage as water disinfectant persists.
The carrier gas was helium (5.7 psi) with an isothermal temperature of 45[degrees]C for
bromoform, bromodichloromethane, and dibromochloromethane and for chloroform a temperature program of 45[degrees]C for 2.6 minutes with a ramp of 20[degrees]C/ min.
Volume Chloroform (ppb) Carbon
Bromoform Benzene Toluene tetrachloride (ppb) (ppb) (ppb) (ppb) 100 <0.05 * <0.05 * <0.5 * <0.05 * <0.1 * 200 <0.05 * <0.05 * <0.5 * <0.05 * <0.1 * 300 <0.05 * <0.05 * <0.5 * <0.05 * <0.1 * * Values below the limit of quantification of the analytical method.
Standard solutions of 200 mg [L.sup.-1] of THM in methanol, including chloroform (CH[Cl.sub.3]), bromodichloromethane (CH[Cl.sub.2]Br), dibromochloromethane (CHCl[Br.sub.2]) and
bromoform (CH[Br.sub.3]), were purchased from AccuStandard[R] (New Haven, USA).
Bromoform is produced naturally in small amounts by oceanic plants and then readily evaporates into the air due to its high volatility (Goodwin et al., 1997).
* Until recently, density measurements required the use of hazardous liquids, such as
bromoform (Koons 2002).
Similar conformation changes, i.e., from an elongated rodlike to a globular structure, were also obtained when dichloromethane was substituted with
bromoform or chloroform, respectively.
In addition, many macroalgae have cell-wall-located haloperoxidases, which are limited in their activity by [H.sub.2][O.sup.2] and which generate hypohalous acids and various halocarbons, such as
bromoform (CH[Br.sub.3]) (Carpenter and Liss, 2000).
NTP (1989) Toxicity and carcinogenesis studies of
bromoform in F344/N rats and B6C3F1 mice (gavage studies).
The 0.05-0.1 mm fraction was separated using
bromoform and the light and heavy minerals were determined separately by the immersion method under the PM in plane and cross-polarized light.
The perfectly coated spheres could be separated by flotation in
bromoform, thoroughly washed and dried.