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Rev.ABACKGROUNDIONLISTPage1OF5ESI+CommonBackgroundIonsm/zIonCompoundSourceofUnknown33(M+H)+methanol42(M+H)+acetonitrile59(M+NH4)+acetonitrile64(M+Na)+acetonitrile65(2M+H)+methanol74(M+H)+dimethylformamide79(M+H)+DMSO83(2M+H)+Acetonitrile85(M+H)+d6-DMSO88(M+FormicAcid+H)+acetonitrile101(M+Na)+DMSO102(M+H)+triethylamine(TEA)104/106(M+Cu)+acetonitrile105(2M+Na)+acetonitrile115(M+dimethylformamide+H)+acetonitrile120(M+Na+CH3CN)+DMSO122(M+H)+tris,tris(hydroxymethyl)aminomethane123(M+H)+dimethylaminopyridine(DMAP)130(M+H)+diisopropylethylamine(DIPEA)137(M+CH3CN+NH4)+DMSO144(M+H)+tripropylamine(TPA)145/147(2M+Cu)+acetonitrile146(3M+Na)+acetonitrile149(M+H)+phthalicanhydride150(M+H)+phenyldiethylamine153(M+H)+1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)157(2M+H)+DMSO159(M+Na)+sodiumtrifluoroacetate163dimethylphthalate167dioctylphthalate169(2M+H)+d6-DMSO171(M+Na)+phthalicanhydride179(2M+Na)+DMSO186(M+H)+tributylamine195(M+H)+dimethylphthalateRev.ABACKGROUNDIONLISTPage2OF5ESI+CommonBackgroundIonsm/zIonCompoundSourceofUnknown214(M+H)+n-butylbenzenesulfonamide(plastisizer)225(M+H)+dicyclohexylurea(DCU)231(M+NH3)+n-butylbenzenesulfonamide(plastisizer)236(M+Na)+n-butylbenzenesulfonamide(plastisizer)239/241[(M.HCl)2-Cl]+triethylamine242M+tetrabutylammonium(C4H9)4N+243M+tritylcation257(3M+H)+DMSO267(M+H)+tributylphosphate273M+monomethoxytritylcation(MMT)279M+triphenylphosphineoxide279M+dibutylphthalate(plasticiser)282(M+H)+oleamideslipagentinpolyethylenefilms284(M+H)+stearamideslipagentinpolyethylenefilms288(M+H)+n,n-bis(2-hydroxyethyl)dodecanamideanti-staticagent301(M+Na)+dibutylphthalate(plasticiser)303(M+Na)+oleamideslipagentinpolyethylenefilms317(M+K)+dibutylphthalate(plasticiser)336(M+H)+tributyltinformate338(M+H)+erucamideslipagentinpolyethylenefilms355siloxanefromsilicacolumn360(M+Na)+erucamideslipagentinpolyethylenefilms371(M+H)+decamethylcyclopentasiloxane388decamethylcyclopentasiloxane391(M+H)+diisooctylphthalate(plasticiser)413(M+Na)+diisooctylphthalate(plasticiser)425(M+Na)+unidentifiedcontaminant(plasticiser)429(M+K)+diisooctylphthalate(plasticiser)seenw/silicacapillaryNanoSprayer445(M+H)+dodecamethylcyclohexasiloxaneseenw/silicacapillaryNanoSprayer449(2M+H)+dicyclohexylurea(DCU)454(M+Na+CH3CN)+diisooctylphthalate(plasticiser)alsoobservedw/highconc.offormicacid462dodecamethylcyclohexasiloxane503seenw/silicacapillaryNanoSprayerRev.ABACKGROUNDIONLISTPage3OF5ESI+CommonBackgroundIonsm/zIonCompoundSourceofUnknown519(M+H)+tetradecamethylcycloheptasiloxaneseenw/silicacapillaryNanoSprayer522Derivedfromrubbertipfromdisposablesyringeplunger531(M+H)+seenw/Nuncpolypropylenetubes536seenw/silicacapillaryNanoSprayer538(acetate)n+(Fe)n+observedw/highconc.ofaceticacid550Derivedfromrubbertipfromdisposablesyringeplunger553(M+Na)+seenw/Nuncpolypropylenetubes555(acetate)n+(Fe)n+observedw/highconc.ofaceticacid569(M+K)+seenw/Nuncpolypropylenetubes587(M+H)+seenw/Vanguardpolypropylenetubes593(M+H)+hexadecamethylcyclooctasiloxane609(M+Na)+seenw/Vanguardpolypropylenetubes610seenw/silicacapillaryNanoSprayer625(M+K)+seenw/Vanguardpolypropylenetubes638seenw/silicacapillaryNanoSprayer667(M+H)+octadecamethylcyclononasiloxane675seenw/newPEEKtubing679(M+H)+frompurifiedwaterandsolventfilters684seenw/silicacapillaryNanoSprayer696(M+NH4)+frompurifiedwaterandsolventfilters701(M+Na)+frompurifiedwaterandsolventfilters741(M+H)+eicosamethylcyclodecasiloxane786(M+Ti)+titaniumadduct798(2M+NH4)+diisooctylphthalate(plasticiser)803(2M+Na)+diisooctylphthalate(plasticiser)Rev.ABACKGROUNDIONLISTPage4OF5ESI-CommonBackgroundIonsm/zIonCompound26CN-acetonitrile45(HCOO)-formate59(CH3CO2)-acetate69(CF3CO2Na)-sodiumtrifluoracetate,TFA79PO3-phosphate80SO3-sulfate95CH3SO3-methanesulfonate97HSO4-97H2PO4-113sodiumtrifluoracetate,TFA127(CF3CO2Na)-sodiumtrifluoracetate,TFA227(CF3CO2Na)-sodiumtrifluoracetate,TFA249(CF3CO2Na)-sodiumtrifluoracetate,TFAESI+Clustersm/zCompound18water32methanol41acetonitrile44PEG,HO-(CH2CH2On-H)+50perfluoro,CF253NH4Cl58PPG58NaCl63NH4Clsalts68NaFAsalts72ReplacementofOHbyOSi(CH3)374KCl74Si(CH3)2O(fromrubber)77NH4Acsalts78DMSO82NaAcRev.ABACKGROUNDIONLISTPage5OF5ESI+Clustersm/zCompound136NaTFA162PolysaccharidesRev.ABACKGROUNDIONLISTPage6OF5ESI+CommonAdductsm/zIon(M+1)(M+H)+(M+18)(M+NH4)+(M+23)(M+Na)+(M+39)(M+K)+(M+33)(M+CH3OH+H)+(M+42)(M+ACN+H)+(M+64)(M+ACN+Na)+(M+79)(M+DMSO+H)+(M+83)(M+2ACN+H)+ESI+CommonIonSeriesm/zCompound79,157,235(nDMSO+H)+101,179,257(nDMSO+Na)+231,522,550plastisizer267,289,330tributylphosphate371,388,445,462cyclosiloxane355,429,503,593,667,741,815plastisizer