南宁市郊空气和大气干湿沉降物中多环芳烃的污染特征-论文.pdf

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1、环境污染与防治第36卷第8期2014年8月南宁市郊空气和大气干湿沉降物中多环芳烃的污染特征*孔祥胜苗迎(中国地质科学院岩溶地质研究所，中国地质科学院岩溶生态系统与石漠化治理重点开放实验室，广西桂林5410O4)摘要采用空气被动采样器和大气千湿采样器分夏、冬季采集大气及其干湿沉降物样品，利用气相色谱一质谱联用仪测定16种多环芳烃(PAHs)优先控制污染物。结果表明：冬、夏季大气干湿沉降物中PAHs的平均值分别为581．06、174．59ng／(m·d)，冬季PAHs的组成以2～3环PAHs为主，夏季以4～6环PAHs为主；冬、夏季空气中PAHs的平均值

2、分别为149．16、168．70ng／d，均以2～3环PAHs为主。大气干湿沉降物PAHs的沉降通量时空变化为：冬季，商住文教混合区>农业区>工业区；夏季，工业区>农业区>商住文教混合区；冬季大于夏季3．3倍。空气PAHs沉降通量的时空变化为：冬季，工业区>商住文教混合区>农业区；夏季，农业区>工业区>商住文教混合区；冬季略低于夏季。关键词多环芳烃环境空气大气干湿沉降空气被动采样器南宁市PollutioncharacteristicofPAHsintheatmosphericdepositionandairofNanningsuburbKONGXia

3、ngsheng，MIAOYing．(InstituteofKarstGeology，ChineseAcademyofGeologicalScience，KeyOpenLaboratoryofKarstEcosys—ternandRockyDesertificationControl，ChineseAcademyofGeologicalScience，GuilinGuangxi541004)Abstract：Thesamplesofambientairandatmosphericdryandwetdepositioninsummerandwintero

4、fNanningwerecollectedbypolyurethanefoampassivesamplers(PUF-PAS)andatmosphericdryandwetdepositionscollector．16prioritycontrolpollutantsofpolycyclicaromatichydrocarbons(PAHs)inthesesampleswerequantitativeanalyzedusinggaschromatography-massspectrometryinstrument(GC-MS)．Theresultss

5、howedthatPAHsdepositionalflu—xesinwinterandsummerhasanaveragevalueof581．06，174．59ng／(m·d)respectively．DominantPAHscom—poundswere2-3ringsPAHsinwinter，butdominantPAHscompoundswere4-6ringsPAHsinsummer．Theaver—agePAHsconcentrationinairofwinterandsummerwere149．16and168．70ng／drespect

6、ively．DominantPAHscompoundsinairwere2-3ringsPAHs．TemporalandspatialdistributionofPAHsinatmosphericdepositionofwin—terwerecommercialandlivingarea>theagriculturearea>theindustrialdistrict，theatmosphericPAHsdepositioninsummerfollowedtheorderofindustrialdistrict>theagriculturearea>

7、thecommercialandlivingarea，andthePAHsconcentrationsinwinterwas3．3timesofthatinsummer．TemporalandspatialdistributionofPAHSinairofwinterwere：theindustrialdistrict>theagriculturearea>thecommercialandlivingarea，inairofsummerweretheagricul—turearea>theindustrialdistrict>thecommercia

8、landlivingarea，andthePAHsconcentrationsinwinterwasslig