Initial Check Verif. Standard 4, in 4%HNO3, 100ml

3,4,5-Trichloroguaiacol , 1000µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. 57057-83-7

o-Xylene, 5ml

Phenyltin trichloride, 1000 µg/ml, Methanol, 5ml