Test condition of alkali durability: Eluent       : 10 mM Phosphate buffer (pH12)/CH3CN=45/55Flow rate    : 0.6 mL/minColumn temp. : 30 ℃

Sample : 5 μL
1. Pyridine 200 mg/L
2. Phenol 430 mg/L


* TPN before flowing alkali eluent is set as 100% in this test.

 Column       : Shodex ODP2 HP-4D (4.6 mm I.D. x 150 mm)

               ODS(A) from other manufacturer (4.6 mm I.D. x 150 mm)

Eluent       : H2O/CH3OH=70/30

Flow rate    : 1.0 mL/min

Detector     : UV (254 nm)

Column temp. : 40 ℃