SPE columns, CHROMABOND C18 f, 100 µm, 6 mL/500 mg Gradation - pH - 2.0 • 2.5 • 3.0 • 3.5 • 4.0 • 4.5 • 5.0 • 5.5 • 6.0 • 6.5 • 7.0 • 7.5 • 8.0 • 8.5 • 9.0 6-Tetrachlorophenol
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