A new element tracer technique has firstly been established to estimate the contributions of mineral aerosols from both inside and outside Beijing.The ratio of Mg/Al in aerosol is a feasible element tracer to distingu...A new element tracer technique has firstly been established to estimate the contributions of mineral aerosols from both inside and outside Beijing.The ratio of Mg/Al in aerosol is a feasible element tracer to distinguish between the sources of inside and outside Beijing.Mineral aerosol,inorganic pollution aerosol mainly as sulfate and nitrate,and organic aerosol are the major components of airborne particulates in Beijing,of which mineral aerosol accounted for 32%―67%of total suspended particles(TSP),10%―70%of fine particles(PM2.5),and as high as 74%and 90%of TSP and PM2.5,respectively,in dust storm.The sources from outside Beijing contributed 62%(38%―86%)of the total mineral aerosols in TSP,69%(52%―90%)in PM10,and 76%(59%―93%)in PM2.5 in spring,and 69%(52%―83%),79%(52%―93%),and 45%(7%―79%)in TSP,PM10,and PM2.5,respectively,in winter,while only~20%in summer and autumn.The sources from outside Beijing contributed as high as 97%during dust storm and were the dominant source of airborne particulates in Beijing.The contributions from outside Beijing in spring and winter are higher than those in summer,indicating clearly that it was related to the various meteorological factors.展开更多
The speciation of the elements on the surface of the particles collected during dust storm and non-dust storm in Beijing and Inner Mongolia was studied by XPS.The ma-jor species of iron on the surface were oxides,sulf...The speciation of the elements on the surface of the particles collected during dust storm and non-dust storm in Beijing and Inner Mongolia was studied by XPS.The ma-jor species of iron on the surface were oxides,sulfate,silicate,FeOOH and minor part sorbed on SiO2/Al2O3.Sulfate is the dominant species of sulfur on the surface.SiO2 and Al2O3 are the main components of Si and Al on the surface respectively.One of the most important findings was that the Fe(II)(FeS and FeSO4)produced could account for up to 44.3%and 45.6%of the total Fe on the surface in the aerosol sample collected at that night and next day of the“peak”time of the dust storm occurring on March 20,2002,while Fe2(SO4)3,one of the Fe(III)species on the surface decreased from 67.1%to 49.5%and 48.0%respectively.Both S and Fe en-riched on the surface of aerosol particles.Fe(II)accounted for 1.3%?5.3%of total Fe in bulk aerosol samples during dust storm.These results provided strong evidence to sup-port the hypothesis of the coupling between iron and sulfur in aerosols during the long-range transport,which would have important impact on the global biogeochemical cycle.展开更多
基金the National Natural Science Foundation of China(Grant Nos.29837190,30230310,20077004&20477004)Beijing Natural Science Foundation(Grant Nos.8991002,8041003)+3 种基金the special fund for the doctoral s tudy of the Education Ministry of China(20010027017)“100-talent Project of CAS(dust transport)”,LAPCThe Institute of Atmospheric Phys ics,CASthe Swedish International Development Cooperation Agency(SIDA)through the Asian Regional Research Program on Environmental Technology(ARRPET)at the Asian Institute of Technology.
文摘A new element tracer technique has firstly been established to estimate the contributions of mineral aerosols from both inside and outside Beijing.The ratio of Mg/Al in aerosol is a feasible element tracer to distinguish between the sources of inside and outside Beijing.Mineral aerosol,inorganic pollution aerosol mainly as sulfate and nitrate,and organic aerosol are the major components of airborne particulates in Beijing,of which mineral aerosol accounted for 32%―67%of total suspended particles(TSP),10%―70%of fine particles(PM2.5),and as high as 74%and 90%of TSP and PM2.5,respectively,in dust storm.The sources from outside Beijing contributed 62%(38%―86%)of the total mineral aerosols in TSP,69%(52%―90%)in PM10,and 76%(59%―93%)in PM2.5 in spring,and 69%(52%―83%),79%(52%―93%),and 45%(7%―79%)in TSP,PM10,and PM2.5,respectively,in winter,while only~20%in summer and autumn.The sources from outside Beijing contributed as high as 97%during dust storm and were the dominant source of airborne particulates in Beijing.The contributions from outside Beijing in spring and winter are higher than those in summer,indicating clearly that it was related to the various meteorological factors.
基金supported by the National Natural Science Foundation of China(Grant Nos.29837190,20077004,and 30230310)Bejjing Natural Science Fund(Grant Nos.8991002 and 8041003)+2 种基金supported by the special fund for doctoral study from the Ministry of EducationLAPC,Institute of Atmospheric Physica,CASthe Swedish Intermational Development Cooperation Agency(SIDA)through the Asian Regional Research Program on Environmental Technology(ARRPET)at the Asian Institute of Technology.
文摘The speciation of the elements on the surface of the particles collected during dust storm and non-dust storm in Beijing and Inner Mongolia was studied by XPS.The ma-jor species of iron on the surface were oxides,sulfate,silicate,FeOOH and minor part sorbed on SiO2/Al2O3.Sulfate is the dominant species of sulfur on the surface.SiO2 and Al2O3 are the main components of Si and Al on the surface respectively.One of the most important findings was that the Fe(II)(FeS and FeSO4)produced could account for up to 44.3%and 45.6%of the total Fe on the surface in the aerosol sample collected at that night and next day of the“peak”time of the dust storm occurring on March 20,2002,while Fe2(SO4)3,one of the Fe(III)species on the surface decreased from 67.1%to 49.5%and 48.0%respectively.Both S and Fe en-riched on the surface of aerosol particles.Fe(II)accounted for 1.3%?5.3%of total Fe in bulk aerosol samples during dust storm.These results provided strong evidence to sup-port the hypothesis of the coupling between iron and sulfur in aerosols during the long-range transport,which would have important impact on the global biogeochemical cycle.
