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Contaminants Observed in LC-MS Background

m/z Accurate Mass (Da) Mode Compound Ion
4242.0338+Acetonitrile(M+H)+
5959.0604+Acetonitrile + Ammonia(M+NH4)+
6464.0158+Acetonitrile + Sodium(M+Na)+
6565.0597+Methanol(2M+H)+
7979.0212+DMSO(M+H)+
8383.0604+Acetonitrile(2M+H)+
101101.0032+DMSO + Sodium(M+Na)+
102102.1277+Triethylamine (TEA)(M+H)+
105105.0423+Acetonitrile + Sodium(2M+Na)+
120120.0478+DMSO + Acetonitrile(M+H+CH3CN)+
122122.0812+Tris (HOCH2)3CNH2(M+H)+
123123.0917+Dimethylaminopyridine (DMAP)(M+H)+
130130.1590+Diisopropylethylamine (DIPEA)(M+H)+
144144.1747+Tripropylamine (TPA)(M+H)+
146146.0689+Acetonitrile + Sodium(3M+Na)+
150150.1277+Pphenyldiethylamine(M+H)+
153153.1386+1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)(M+H)+
157157.0351+DMSO(2M+H)+
159158.9640+Sodium trifluoroacetate(M+Na)+
179179.0171+DMSO + Sodium(2M+Na)+
186186.2216+Tributylamine(M+H)+
225225.1961+Dicyclohexyl urea (DCU)(M+H)+
243243.1168+Trityl cationM+
279279.1591+Dibutylphthalate (plasticiser)(M+H)+
301301.1410+Dibutylphthalate (plasticiser) + Sodium(M+Na)+
317317.1150+Dibutylphthalate (plasticiser) + Potassium(M+K)+
338338.3417+Erucamide(M+H)+
391391.2843+Diisooctyl phthalate (plasticiser)(M+H)+
413413.2662+Diisooctyl phthalate (plasticiser) + Sodium(M+Na)+
429429.2402+Diisooctyl phthalate (plasticiser) + Potassium(M+K)+
454454.2928+Diisooctyl phthalate (plasticiser) + Sodium + Acetonitrile(M+Na+CH3CN)+
798798.5878+Diisooctyl phthalate (plasticiser) + Ammonia(2M+NH4)+
803803.5432+Diisooctyl phthalate (plasticiser) + Sodium(2M+Na)+
142142.0297+DMSO + Acetonitril(M+Na+CH3CN)+
214+unidentified contaminant, maybe related to methanol(M+H)+
239/241+Triethylamine[(M.HCl)2-Cl]+
242242.2842+Ttetrabutylammonium (C4H9)4N+M+
273273.1274+Monomethoxytrityl cation (MMT)M+
282282.2793+Oleamide(M+H)+
360360.3237+Erucamide + Sodium(M+Na)+
425+Unidentified contaminant (plasticiser) + Sodium(M+Na)+
449449.3850+Dicyclohexyl urea (DCU)(2M+H)+
231, 522, 550+From rubber tip of disposable syringe plunger
297, 371, 445, 519 (+74n)+Polysiloxanes, from air, silicone rubber
355, 429, 503, 593, 667, 741, 815 (+74n)+Polysiloxanes, from air, silicone rubber
538, 556, 574+Iron carboxylate complexes: 538 = Fe3O(AcO)6, 556 = Fe3O(AcO)6(H2O), 574 = Fe3O(AcO)6(H2O)2