Instrument Standard 3

O,O-Diethyl dithiophosphate-13C4, ammonium salt,100 µg acid/mL,MeOH,1mL,

4-tert-Octylphenol,1000 µg/mL,MeOH,1mL,

Metronidazole,1000 µg/mL,MeOH,1mL,