有機臭素系難燃剤hexabromobenzene(hbb)の光分解
Photodegradation of Flame Retardant Hexabromobenzene (HBB)

Masahide KAWANO, Yukihiko YAMAGUCHI, Ryo TATSUKAWA
1983 Nippon Nogeikagaku-kaishi  
Hexabromobenzene (HBB) is a commonly used flame retardant. It is mainly used indoors, and its estimated annual production was about 900 tons in Japan in 1976. Hexane solutions of HBB were exposed to sunlight, fluorescent lamps and high pressure mercury lamps, and the residual as well as photodegradation products were determined by GC and GC-MS. The HBB half lives under sunlight, fluorescent lamps and high pressure mercury lamps were 150, 6400 and 3.2 min, respectively. Penta-, tetra-, tri-and
more » ... , tetra-, tri-and di-bromobenzene were found as photodegradation products. The same stepwise debromination process occurred under these three irradiation sources but at different rates. In the case of sunlight, the degradation rate of HBB depended on the diurnal light intensity. Hexachlorobenzene (HCB) showed a half life that was about three times longer than HBB under a high pressure mercury lamp, which indicates the higher photodegradability of HBB. The photodegradation processes and the envi ronmental fate of HBB and its impact on biota are also discussed. (
doi:10.1271/nogeikagaku1924.57.313 fatcat:2h2gsdqaifekxdhlzcroz4vdxy