长三角地区某湖水中溶解性有机物组分特性及亚硝胺消毒副产物生成特性

长三角地区某湖水中溶解性有机物组分特性及亚硝胺消毒副产物生成特性王成坤廖晓斌汪隽刘源源张晓健陈超幸-(清华大学环境学院，北京，l∞084，chen_watm'@tsinghua．edu．cn)摘要：本文以长江三角洲某湖水为研究对象，采用三维荧光光谱与高效液相色谱分析方法对水中所含有机物成分进行分析，并关注该水体亚硝胺消毒副产物的生成特性．结果表明，该湖水中绝大部分有机物的分子量均小于3000Da．对六次采样平均而言，分子量为1000—3000Da、5001000Da和小于500Da的有机物所占比例分别为51．2jl、20．7％和27．3％．芳香族蛋白和微生物代谢产物是湖水中有机物的主要成分．上述结果表明该湖泊已经受到人类活动所排放污染物的影响．湖水在一氯胺消毒条件下能显著生成包含NDMA、NPYR、NMOR、NDEA和NPIP在内的五种亚硝胺．其中，NDMA和NDEA具有比其他三种亚硝胺副产物更大的生成量，说明湖水中舍有大量能生成这些亚硝胺副产物的前体物．关键词：亚硝胺，消毒副产物，溶解性有机物，三维荧光光谱，分子量分布CharacteristiesandN．nitrosaminesformationofdissolvedorganicmatterinthesourcewaterofoneLakeinYangtzeDeltaWANGCheng-kun，LIAOXiao-bin，WANGJun，LIUYuan-yuan，ZHANGXiao-jian,CHENChao(SchoolofEnvironment,TsinghuaUniversity,Beijing，looos4)Abstract：1fl坞characteristicsofdissolvedorganicmatter(DOM)inthesourcewaterfromonelakeinYangtzeDeltawereinvestigated．Highperformancesizeexclusionchromatography(HPSEC)wasusedtodeterminethemolecularweightofDOMintherawwatal-．Three-dimensionalexcitation．emissionmatrix01EM)fluorescencespectrawereusedtomomtorthechangeofthetypesofDOM．N-nitrosaminesformationw嬲determinedoftheraWwater．Themolecularweightfraction<3kDawasthedominantfractioninthissourcewater．Onaverage，themolecularweightfraction1～3kDa，0．5-1kDa,and<0．5kaccountedforabout51．2％，20．7％，and27．3％ofthetotalorganicmatter,respectivelyforthesixwatersamples．TheorganicmatterscontainedintheraWwaterⅥ，e∞mainlycomposedofaromaticproteinandsolublemicrobialproductsindicatingthatthesourcewatermaybeimpactedbythewastewatvrdischarge．FiveN-nitrosaminesincludingNDM～NDEA，NMO＆NPYR,andNPIPweredetectedwhentherawwaterwasdisinfectedwitllmonochloramine．11圮NDMAandND队hadmuchhigherconcentrationsthanthoseoftheotherN-nitrosaminvssuggestingthatthereshouldbemol'eprecursorsofNDMAandNDEAcontainedinthissourcewater．Keywords：N-nitrosamines，Disinfectionby-products；Dissolvedorganicmatter,ExcitationemissionmatrixfhIon珞caⅡcespectroscopy；molecularweightdistribution1基金资助：国家十一五重大水专项(2∞82聊42咖05)、国家自然科学基金(51078208)-516-引言溶解性有机物(Dissolvedorgamcn诅ttea',DOM)及其代谢产物是水体色和臭味的主要来源(Baghotheta1．，