75-25-2 Tribromomethane

Trihalomethanes. Wherever chlorine is used as a disinfectant in drinking-water treatment, trihalomethanes (THMs) generaUy are present in the finished water. The THMs usuaUy formed are trichloromethane (chloroform), bromodichloromethane, dibromochloromethane, and tribromomethane (bromoform). There are four main techniques for the analysis of THMs headspace, Hquid— Hquid extraction (Ue), adsorption—elution (purge—trap), and direct aqueous injection. The final step in each technique involves separation by gas—Hquid chromatography with a 2 mm ID coUed glass column containing 10 wt % squalene on chromosorb-W-AW (149—177 p.m (80—100 mesh)) with detection generaUy by electron capture. 

On heating S9O decomposes at 32-34 °C with melting and SO2 evolution. At 20 °C the solid oxide decomposes quantitatively within 2 h to SO2 and a polymeric sulfuroxide (S 0)x with n>9. Even dissolved in carbon disulfide S9O decomposes within 20 min to a large extent with formation of SO2 as can be seen from the decrease of the infrared absorption intensity at 1134 cm (S9O) and the intensity increase at 1336 cm (SO2). The solubihty of S9O in CS2 (>21 g r at 0 °C) is much higher than in CH2CI2 (260 mg at 0 °C) while the substance is practically insoluble in n-pentane, n-hexane and tribromomethane. At -80 °C, S9O can be stored for longer periods of time without decomposition. 

Dibromocarbene CBr2 has been formed in inert matrices by two different procedures. The reaction of CBr4 with lithium atoms in an argon matrix as well as the irradiation (with vacuum UV light) of a matrix containing tribromomethane HCBrs led to the appearance in the IR spectra of two bands of CBt2 at 595 and 641 cm . These absorptions were assigned, respectively, to the symmetrical and asymmetrical C—Br stretches. 

Canton, J.H., Wegman, R.C.C. (1983) Studies on the toxicity of tribromomethane, cyclohexene, and bromocyclohexane to different fresh water organisms. Water Res. 17, 743-747. 

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