According to the 1994 EHC Review, follow-up surveys over a three-year period following the termination of PBB production showed no significant decline in PBB levels in sediments from a river.
The term" c-octaBDE" designates a commercial mixture containing polybrominated diphenyl ethers, typically consisting of penta- to deca-bromodiphenyl ether congeners.
It is estimated that at least 11,000 tons of PBBs were produced worldwide, but production figures from some countries known to have produced PBBs are not available(IPCS 1994).
PBBs were added to acrylonitrile butadiene styrene(ABS) plastic(10% PBBs), coatings, lacquers and polyurethane foam(IPCS 1994; International Programme on Chemical Safety(IPCS), 1994Melber and others 1994).
Technical grade PBBs(FireMaster(R)) contain several PBB compounds, isomers and congeners, hexabromobiphenyl being one of the main components.
在暴露程度较高的人中阴毛发育早,表明多溴联苯对青春期的影响(Blanck等人,2000年)。
Earlier pubic hair development was also seen in the more highly exposed population, suggesting an effect of PBBs on pubertal events(Blanck et al., 2000).
The PBBs(and by inference, hexabromobiphenyl) are endocrine disrupting(ED) chemicals, and effects are seen on reproductive capacity in rats, mink and monkeys.
The toxicity is similar to other chlorinated compounds such as PDDD/Fs and PCBs, PBBs and PBDEs and is mainly mediated via induction of cytochrome P-450 enzymes.
Each country should identify, through guidelines or legislation, standard methods that are required to be used for PCBs, PCTs and PBBs and the situations in which the methods should be used.
Shortly after the 1973- 1974 agriculture contamination accident in Michigan, PBB production in the United States was voluntarily discontinued(Hardy 2000); PBBs are no longer produced in the United States(SRI 2001).
PBBs(as a group) were not found in otters(Lutra canadensis) from a region relatively remote from industrial sites in north eastern Alberta(Canada)(Somers et al., 1987).
Fish samples(freshwater and marine species) collected in 1983 from an industrial area of Japan(Osaka) did not contain" PBBs"(not specified)(Watanabe& Tatsukawa, 1990).
The document is accompanied by two case studies, one on polybrominated diphenyl ethers and the other on carbamates, which illustrate the application of the framework.
多溴联苯的商业生产始于1970年。
The commercial production of PBBs began in 1970.
多溴联苯的主要途是作为阻燃剂。
The principal use of PBBs was as a fire retardant.
本阶段没有关于欧盟进口多溴联苯的登记。
No imports of PBBs to the European Unions are registered in this period.
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