H. Araya, SUBSIDIARY FORMATION OF TRIHALOMETHANES B Y OXIDATION DECOMPOSITION USING SODIUM-HYPOCHLORITE OF LIQUID WASTE CONTAINING CYANIDE, Nippon kagaku kaishi, (5), 1995, pp. 402-406
Under the conditions of the oxidation decomposition reaction using sod
ium hypochlorite of liquid waste containing cyanide, methyl ketones an
d certain other compounds with bromide often afforded the reaction pro
ducts, such as trichloromethane, bromodichloromethane, dibromochlorome
thane and tribromomethane (referred to as ''trihalomethanes''). Trihal
omethanes are regulated as environmental pollutants. In order to contr
ol the formation of trihalomethanes, therefore, the formation conditio
ns were examined. Using acetone, one of the trihalomethane precursors,
the experimental results indicated that most of trihalomethanes were
given by the first step reaction of the cyanide decomposition, and tha
t large amounts of tribromomethane were produced on approximately pH 1
2. However, some of the formation conditions for trihalomethanes were
different from those for the cyanide decomposition. It might mean that
the formation reaction could be suppressed by the accurate control of
the cyanide decomposition.