Influence of combustion-originated dioxins in atmospheric deposition on water quality of an urban river in Japan  

作　　者：Kotaro Minomo Nobutoshi Ohtsuka Kiyoshi Nojiri Rie Matsumoto 

机构地区：[1]Center for Environmental Science in Saitama, Kazo, Saitama 347-0115, Japan

出　　处：《Journal of Environmental Sciences》2018年第2期245-251,共7页环境科学学报（英文版）

摘　　要：Bulk（wet and dry） deposition samples were collected in Saitama Prefecture, Japan throughout a year（February 8, 2012 to February 7, 2013） to estimate the influence of dioxins emitting from waste incinerators on river water quality. The annual deposition flux of dioxins was 3.3 ng-toxic equivalent（TEQ）/m^2/year. Source identification using indicative congeners estimated that 82% of dioxin TEQ in the bulk deposition（2.7 ng-TEQ/m^2/year）was combustion-originated, indicating that most of the dioxins in the deposition were derived from waste incinerators. In Saitama prefecture the annual flux of combustionoriginated dioxins in depositions was apparently consistent with that of dioxin emission into the air from waste incinerators. The TEQ of combustion-originated dioxins in the deposition per rainfall was 2.4 pg-TEQ/L on annual average, exceeding the environmental quality standard（EQS） for water in Japan of 1 pg-TEQ/L. This suggests there is a possibility that dioxins in atmospheric deposition have a significant influence on the water quality of urban rivers which rainwater directly flows into because of many paved areas in the basins.The influence of combustion-originated dioxin in the deposition on the water quality of Ayase River, an urban river heavily polluted with dioxins, was estimated at 0.29 pg-TEQ/L on annual average in 2015. It seems that dioxins in atmospheric deposition from waste incinerators have a significant influence on water quality of some urban rivers via rainwater though the dioxins in the ambient air have achieved the EQS for atmosphere at all monitoring sites in Japan.Bulk（wet and dry） deposition samples were collected in Saitama Prefecture, Japan throughout a year（February 8, 2012 to February 7, 2013） to estimate the influence of dioxins emitting from waste incinerators on river water quality. The annual deposition flux of dioxins was 3.3 ng-toxic equivalent（TEQ）/m^2/year. Source identification using indicative congeners estimated that 82% of dioxin TEQ in the bulk deposition（2.7 ng-TEQ/m^2/year）was combustion-originated, indicating that most of the dioxins in the deposition were derived from waste incinerators. In Saitama prefecture the annual flux of combustionoriginated dioxins in depositions was apparently consistent with that of dioxin emission into the air from waste incinerators. The TEQ of combustion-originated dioxins in the deposition per rainfall was 2.4 pg-TEQ/L on annual average, exceeding the environmental quality standard（EQS） for water in Japan of 1 pg-TEQ/L. This suggests there is a possibility that dioxins in atmospheric deposition have a significant influence on the water quality of urban rivers which rainwater directly flows into because of many paved areas in the basins.The influence of combustion-originated dioxin in the deposition on the water quality of Ayase River, an urban river heavily polluted with dioxins, was estimated at 0.29 pg-TEQ/L on annual average in 2015. It seems that dioxins in atmospheric deposition from waste incinerators have a significant influence on water quality of some urban rivers via rainwater though the dioxins in the ambient air have achieved the EQS for atmosphere at all monitoring sites in Japan.

关 键 词：DIOXINS Waste incineration Atmospheric deposition Urban river River water Source identification Indicative congener 

分 类 号：X701[环境科学与工程—环境工程]