Material Flow Analysis and Environmental Behavior of Polybrominated Diphenyl Ethers

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  • ポリ臭素化ジフェニルエーテルのマテリアルフロー解析と環境動態
  • ポリ シュウソカ ジフェニルエーテル ノ マテリアルフロー カイセキ ト カンキョウ ドウタイ

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Abstract

Recent research on material flow analysis (MFA) and atmospheric environmental behavior of polybrominated diphenyl ethers (PBDE) are reviewed in this paper. MFA studies can be classified into two categories: top-down or bottom-up types. In the top-down type, the amount of PBDE stock for each application is estimated based on trends in domestic demand for PBDE with the share of each product category. The bottom-up type builds up the flows based on concentrations in the individual final products and product flow volumes. Due to the ban on PBDE, the bottom-up type has become more important. Based on the atmospheric monitoring of PBDE, a declining trend in pentabromodiphenyl ether and octabromodiphenyl ether has been confirmed in many areas, however, due to delayed regulation on decabromodiphenyl ether, a trend of decline for this compound is still weak or as yet unconfirmed. In fact, some areas are observing a trend toward increase. As the environmental concentration decreases, non-detect data is expected to increase. It is therefore vital that appropriate analysis methods are identified, such as applying a model that can deal with censored data.

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