Modeling historical budget for β-Hexachlorocyclohexane(HCH)in the Arctic Ocean:A contrast to α-HCH  

作　　者：Pu-Fei Yang Robie W.Macdonald Hayley Hung Derek C.G.Muir Roland Kallenborn Anatoly N.Nikolaev Wan-Li Ma Li-Yan Liu Yi-Fan Li 

机构地区：[1]International Joint Research Center for Persistent Toxic Substances(IJRC-PTS),State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin,150090,China [2]International Joint Research Center for Arctic Environment and Ecosystem(IJRC-AEE),Polar Academy,Harbin Institute of Technology,Harbin,150090,China [3]Institute of Ocean Sciences,Department of Fisheries and Oceans,Sidney,BC,V8L 4B2,Canada [4]Centre for Earth Observation Science,University of Manitoba,Winnipeg,R3T 2N2,Canada [5]Air Quality Processes Research Section,Environment and Climate Change Canada,Toronto,Ontario,Canada [6]Canada Centre for Inland Waters,Environment and Climate Change Canada,Burlington,Ontario,Canada [7]Faculty of Chemistry,Biotechnology and Food Sciences(KBM),Norwegian University of Life Sciences(NMBU),NOe1433 As,Norway [8]Institute of Natural Sciences,North-Eastern Federal University,Russia [9]IJRC-PTS-NA,Toronto,Ontario,M2N 6X9,Canada

出　　处：《Environmental Science and Ecotechnology》2023年第2期18-28,共11页环境科学与生态技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.42077341);Natural Science Foundation of Heilongjiang Province of China(No.LH2021E096);State Key Laboratory of UrbanWater Resource and Environment(Harbin Institute of Technology)(No.2022TS05);the Polar Academy,Harbin Institute of Technology(No.PA-HIT-201901);the support from Heilongjiang Provincial Key Laboratory of Polar Environment and Ecosystem(HPKLPEE),Harbin Institute of Technology;funding from Canada's Northern Contaminants Program(Crown-Indigenous Relations and Northern Affairs Canada).

摘　　要：The historical annual loading to,removal from,and cumulative burden in the Arctic Ocean for β-hexachlorocyclohexane(β-HCH),an isomer comprising 5e12%of technical HCH,is investigated using a mass balance box model from 1945 to 2020.Over the 76 years,loading occurred predominantly through ocean currents and river inflow(83%)and only a small portion via atmospheric transport(16%).β-HCH started to accumulate in the Arctic Ocean in the late 1940s,reached a peak of 810 t in 1986,and decreased to 87 t in 2020,when its concentrations in the Arctic water and air were~30 ng m^(-3)and~0.02 pg m^(-3),respectively.Even though β-HCH and α-HCH(60e70%of technical HCH)are both the isomers of HCHs with almost identical temporal and spatial emission patterns,these two chemicals have shown different major pathways entering the Arctic.Different from α-HCH with the long-range atmospheric transport(LRAT)as its major transport pathway,β-HCH reached the Arctic mainly through long-range oceanic transport(LROT).The much higher tendency of β-HCH to partition into the water,mainly due to its much lower Henry's Law Constant than α-HCH,produced an exceptionally strong pathway divergence with β-HCH favoring slow transport in water and α-HCH favoring rapid transport in air.The concentration and burden of β-HCH in the Arctic Ocean are also predicted for the year 2050 when only 4.4-5.3 t will remain in the Arctic Ocean under the influence of climate change.

关 键 词：β-Hexachlorocyclohexane Arctic Ocean Mass balance model BUDGET Air-water exchange 

分 类 号：X50[环境科学与工程—环境工程]