See section 4.2 (Is this the process?)

To prepare a 1M Ammonium formate solution:

add 63.06 grams of ammonium formate to a 1L volumetric flask, add ~ 500 mL distilled water and dissolve the salt, then bring up to volume (1L).

http://hahana.soest.hawaii.edu/hot/protocols/chap18.html

You can use ammonium formate (3.6% w/v). Please see my colleagues' publication for reference.