Pollution Characteristics,source Apportionment And Human Exposure Of Pbdes In Typical Indoor Public Places In Hangzhou

In recent years,the development of electronic computer and polymer composite materials have promote the use of flame retardants.As the representative of brominated flame retardants,polybrominated diphenyl ethers continued to spread into the environment,leading to a serious environmental pollution.In order to ascertain the pollution status of PBDEs in city indoor environment,the typical indoor public places in Hangzhou were selected as the researching sites,GC analysis methods were used.Paper arounding the pollution characteristics/interior sources and human exposure levels to make study.The major findings were as follows:(1)Average concentration of PBDEs in supermarkets and electronic market dust in Hangzhou was 546.13 ng/g and 1140.05ng/g,respectively.The partition comparison of Qianjiang commodity market of PBDEs concentration was shoe areas>parking areas>waiting halls>bag areas>curtain areas.(2)The average content of the four seasons of PBDEs of passive air samples in university laboratory was 545.64 pg/m~3,the highest levels was in winter and the lowest was in summer.As a whole,the pollution of PBDEs in university laboratory air was in the medium level.Average content of PBDEs in dust fall was 8198.69 ng/g,generally higher than that of the existing research results.The mean value of deposition flux of PBDEs was 121.96ng/(m~2·d).(3)BDE-209 was the main congener of PBDEs in all researched areas in typical indoor public places in Hangzhou,and BDE-47,BDE-66,BDE-99 also made a great contribution to the total content of PBDEs.Supermarket monomer proportion is higher,middle and lower bromine generation high bromine generation monomer proportion is higher.Laboratory in this paper was generally polluted by low generation bromine biphenyl ether.(4)Content and subsidence flux of PBDEs presented regional differences and sample points difference,which instructed uneven distribution of PBDEs.And this is mainly caused by the differences of indoor decoration,the function of the room,ventilation habits and the surrounding environment.(5)Content of PBDEs in air/dust and sedimentation flux of PBDEs in laboratory had no significant correlation with season,that was its not significantly affected by temperature and other seasonal factors.Extremely significant or significant correlation was existed between deposition flux of PBDEs and dust.Conducted a linear fitting,the results showed R~2 was in the range of 0.514~0.825.It showed that the amount of dust is an important factor of deposition flux in laboratory.(6)The research of human exposure level of PBDEs showed that human exposure levels of PBDEs had differences in different indoor environments,teachers and students in laboratory were bearing the highest exposure levels.Due to the special habits,children exposed much higher level than adults through dust/dust intake.Compared with the reference dose proposed by EPA,people exposed low levels of PBDEs in Hangzhou typical indoor public places.