Hplc grade acetonitrile acn

Ferric chloride hexahydrate (FeCl 3 •6H 2 O), ethylene glycol (EG), polyethylene glycol 4000 (PEG-4000), anhydrous sodium acetate (NaAc), tris(hydroxymethyl)aminomethane hydrochloride (Tris), HPLC grade formic acid and acetic acid (HAc) were all obtained from Sinopharm Chemical Reagent Co., Ltd (Shanghai, China). Carboxyl-functionalized multiwalled carbon nanotubes (O.D. 20-30 nm, length 0.5-2 µm) were supplied by Chengdu Organic Chemistry Co., Ltd (Chengdu, China). Dopamine hydrochloride (98%) was purchased from Aladdin (Shanghai, China). HPLC grade reagents 2-chlorophenol (2-CP), 4-chlorophenol (4-CP), 2,6-dichlorophenol (2,6-DCP), 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) were obtained from Sigma-Aldrich (Shanghai, China). HPLC grade acetonitrile (ACN) and methanol (MeOH) were purchased from J&K Scientific (Shanghai, China).
Throughout the study, ultrapure water with the specific resistance of 18.2 MΩ cm was produced using the Pall Cascada™ lab water purification system (Pall Corp., USA) and was used for the preparation of aqueous solution. All other solvents and chemicals were of analytical grade and used directly without further purification.