1-Chloro-2,4-dinitrobenzene, 100 µg/ml, Methanol,

Trichlorfon, 10.0 µg/ml, Acetonitrile, 10ml

2-Hydroxy-3-methylbutyric acid

ISO 15753 Alternatively: Standard solution of 16 EPA-PAHs may be used, but this mixture also contain acenaphtylene S-4470-100-T EPA (=S-4063-100-T) 100µg each/mL in toluene; unit: 1x1mL