Tri-n-propyl phosphate-d21, 1.2ml x 50ug/ml, toluene

Metolachlor ESA sodium salt, 25mg

EPA Method 632 Spike Standard

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