Diflufenican, 100 µg/ml, Acetonitrile, 5ml

Nitrite (NO2-) as N, 100µg/ml in Water, 100ml

(±)-trans-11-Nor-9-carboxy-delta-9-THC, 1000µg/ml in MeOH, 1ml

ISO 9377-2MOD Extraction Solvent Stock Solution I 20ul of n-Heptane and 20mg of n-Tetracontane solved in 1000ml n-Pentane