Halogenated disinfection byproducts(DBPs)are an unintended consequence of drinking wa-ter disinfection,and can have significant toxicity.XAD resins are commonly used to extract and enrich trace levels of DBPs for comprehensive,nontarget identification of DBPs and also for in vitro toxicity studies.However,XAD resin recoveries for complete classes of halo-genated DBPs have not been evaluated,particularly for low,environmentally relevant levels(ng/L to low pg/L).Thus,it is not known whether levels of DBPs or the toxicity of drinking wa-ter might be underestimated.In this study,DAX-8/XAD-2 layered resins were evaluated,con-sidering both adsorption and elution from the resins,for extracting 66 DBPs from water.Re-sults demonstrate that among the 7 classes of DBPs investigated,trihalomethanes(THMs),including iodo-THMs,were the most efficiently adsorbed,with recovery of most THMs rang-ing from 50％-96％,followed by halonitromethanes(40％-90％).The adsorption ability of XAD resins for haloacetonitriles,haloacetamides,and haloacetaldehydes was highly dependent on the individual species.The adsorption capacity of XAD resins for haloacetic acids was lower(5％-48％),even after adjusting to pH 1 before extraction.Recovery efficiency for most DBPs was comparable with their adsorption,as most were eluted effectively from XAD resins by ethyl acetate.DBP polarity and molecular weight were the two most important factors that determine their recovery.Recovery of trichloromethane,iodoacetic acid,chloro-and iodo-acetonitrile,and chloroacetamide were among the lowest,which could lead to under-estimation of toxicity,particularly for iodoacetic acid and iodo-acetonitrile,which are highly toxic.

Xiaobin Liao;Joshua M.Allen;Caroline O.Granger;Susan D.Richardson

Department of Chemistry and Biochemistry,University of South Carolina,Columbia,South Carolina 29208,USA;Institute of Municipal and Environmental Engineering,College of Civil Engineering,Huaqiao University,Fujian 361021,China;Currently at LanzaTech,535 Commerce Drive,Soperton,Georgia 30457,USA

环境科学学报（英文版）

[1]Xiaobin Liao;Joshua M.Allen;Caroline O.Granger;Susan D.Richardson-.How well does XAD resin extraction recover halogenated disinfection byproducts for comprehensive identification and toxicity testing?)[J].环境科学学报（英文版）,2022(07):264-275

unintended,halonitromethanes,haloacetonitriles,haloacetamides,haloacetaldehydes,haloacetic,trichloromethane,iodoacetic,chloroacetamide

well,does,XAD,extraction,halogenated,disinfection,byproducts,comprehensive,identification,toxicity,testing,Halogenated,DBPs,are,consequence,drinking,have,significant,resins,commonly,used,enrich,trace,levels,nontarget,also,vitro,studies,However,recoveries,complete,classes,not,been,evaluated,particularly,environmentally,relevant,pg,Thus,known,whether,might,underestimated,In,this,study,DAX,layered,were,sidering,both,adsorption,elution,from,extracting,water,sults,demonstrate,that,among,investigated,trihalomethanes,THMs,including,most,efficiently,adsorbed,recovery,rang,followed,ability,was,highly,dependent,individual,species,capacity,acids,lower,even,after,adjusting,before,Recovery,efficiency,comparable,their,eluted,effectively,ethyl,acetate,polarity,molecular,weight,two,important,factors,determine,lowest,which,could,lead,estimation

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