Chlorpyrifos, 100 µg/ml, Toluene, 1ml

Ciprofloxacin, 1000µg/ml in 0,1mol/l HCl, 1ml

n-Pentacontane

EPA Method 525.2 Pesticide Mix #1, 100µg/mL in toluene : hexane [1:1], 1ml