Nitrate & Nitrite as N

9,10-Dimethylphenanthrene, 500µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 604-83-1

n-Octadecane, ?13C: -30.71, 150µg/mL, Solvent-cyclohexane, Unit 1mL, # of units-5, Cas.no. 593-45-3

Chromium (Cr), 1µg/ml in 2%-HNO3/Water, 4 x 25ml