A=0.1%H3PO4, flow rate=1.0ml/min, wavelength=210nm

Try this

Gudluck

:)

A(0.1%HClO4):B(ACN)=98:2,flow rate=1.0ml/min,wavelength=210nm, it maybe works, but LOD below 1 ppm will be a challenge.

http://apjcn.nhri.org.tw/server/apjcn/volume16/vol16suppl.1/jianongli(127-130).pdf gothrough this paper u will get some help if formaldehyde detected by hplc i think that method can be followed for formic acid also

in acetate buffer with ph 4.5 and wavelength 285nm by UV only...

Mobile phase: Diluted perchloric acid 5 in 1000

Detector: UV 210 nm water

Column SCX, 250 x 4.6 , 10µ (L17)

Flow adjust as per your analyte