Halogenated Flame Retardants In Surface Soils And Paired Cypress Leaves From Chemical Industrial Parks

Flame retardants（FRs）are a class of organic compounds with great fire performance,after being released into environment,they will bioaccumulate into the human body through three exposure pathway.Unfortunately,many studies revealed their adverse effects of human,like teratogenic,carcinogenic,mutagenic,teratogenicity,reproductive toxicity,neurological and cardiovascular toxicity,and DNA damage.Understanding the distribution characteristics of pollutants in the environment is the basis for further scientific researches.Industrial activities,especially the production of flame retardants,is one of the most important sources for them in the environment.The accumulation of FRs in soils and paired plant leaves might reflect the long-term and short-term pollution,respectively,however,the relevant paired studies are limited.Thus,in the present study,polybrominated diphenyl ethers（PBDEs）and its alternatives of dechlorane plus（DP）,and decabromodiphenyl ethane（DBDPE）in surface soils and paired cypress leaves were investigated in two different industrial parks both from the largest brominated flame retardants（BFRs）manufacture center of China.And then,we analyzed the composition,distribution,and source of the target FRs in the soils and leaves in depth,as well as the correlation of FRs between the two matrices.These mentioned chemicals were frequently detected（>86.2%）with high levels of PBDEs（median:1.22×10~3 ng/g）and DBDPE（median:227 ng/g）in the soil samples,and with high levels of DBDPE（median:881 ng/g）and PBDEs（median:461 ng/g）in paired cypress leaves.Such phenomenon mian caused by production and the physicochemical properties of compounds.Furthermore,in the separate industrial parks,LG industrial park had higher concentration of PBDEs and DBDPE in both soils and cypress leaves than BH industrial park（p<0.05）,which might due to the higher yield in it.FRs factories and building material factories are the main sources of PBDEs and DBDPE pollution,while the use and disposal of DP products during urban activities are the main sources of DP.But not significant correlations were observed for these chemicals between soils and leaves,although significant positive correlations were observed for several PBDE congeners（p<0.05）among all samples from industrial parks.In addition,the concentrations of most targets in leave were 1.06-50.7 times of those in soil.These results indicated that soil was not the important source of these chemicals in leaves,but air-exchange as well as particle deposition might be the main contributor.Since the production of DBDPE is replacing PBDEs,resulting the sharply increased pollution of DBDPE in the environment.Considering the migration rate of pollutants in the atmosphere is much higher than in soil,and DBDPE is the characterized pollutants in cypress leaves,so the target composition in cypress leaf revealed the short-term pollution.These results deepened the understanding of the pollution characteristics of heavy polluted industrial parks,and the potential distribution and migration of pollutants.Moreover,they could provide scientific guidance for the government to carry out relevant environmental monitoring,management and restoration works.