Custom Nitrogen Set, 0,1,2,5,10,20,30ng/μL, 7x2ml

Propylene thiourea, 250mg

Formaldehyde (0.3 ppm)

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