UHPLC-MS Solvents aijiren Tech™ ultrapure solvent are designed to deliver the highest sensitivity , help ensure ensure low formation of metal ion adducts and improve peak profiles. Browse Now. Ammonium formate, (10mM) in Methanol with 0.05% Formic Acid. Ammonium formate, (10mM) in Water with 0.05% Formic Acid.