“…17,38 This acid has already been investigated as a leachant for spent catalysts. 39,40 Different from many carboxylic acids (citric, malic, succinic, oxalic, iminodiacetic, tartaric), 5,21 formic acid has apparently not been tested yet. Like oxalic acid, the simplest aliphatic monocarboxylic acid is a strong reductant, but does not precipitate metal ions as does oxalate.…”