Triethylamine Contamination

Dong-

TEA and other amine ion-pairing reagents can be hard to remove from the LC.MS system.

I have found this works well.  Make sure your reservoirs/frits are clean and flush the HPLC at a low flow rate (~0.05-0.1 ml/min) with 50% iPrOH/40% H2O, and 10% AcOH for a couple of days.  Do not send this to the MS source, but either divert to waste or disconnect solvent line form the MS and place in a waste receptacle.

Make sure to clean the source, nebulizer and spray shield.

You will want to use good chemical hyenine if you use nitric acid since residue left in or around the HPLC (leaks..) will cause corrosion of nearby equipment.

Dong-

TEA and other amine ion-pairing reagents can be hard to remove from the LC.MS system.

I have found this works well.  Make sure your reservoirs/frits are clean and flush the HPLC at a low flow rate (~0.05-0.1 ml/min) with 50% iPrOH/40% H2O, and 10% AcOH for a couple of days.  Do not send this to the MS source, but either divert to waste or disconnect solvent line form the MS and place in a waste receptacle.

Make sure to clean the source, nebulizer and spray shield.

You will want to use good chemical hyenine if you use nitric acid since residue left in or around the HPLC (leaks..) will cause corrosion of nearby equipment.

Thank you for your answer， best regards .