GC column, Nonpolar, OPTIMA 1, 25 m L, 0.20 mm ID, 0.1 µm df Gradation - Arsenic - 0 • 0.005 • 0.01 • 0.025 • 0.05 • 0.1 • 0.25 • 0.5 mg/L As³⁺ ⁵⁺ A = silica gel /
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