Pipet 2.0 mL of this solution into a freshly conditioned solid phase extraction column containing benzenesulfonic acid strong cation-exchange packing with a sorbent-mass to column volume ratio of 500 mg per 3 mL, or equivalent, and elute into a 5-mL volumetric flask.
Pipet 2.0 mL of this solution into a freshly conditioned solid phase extraction column containing benzenesulfonic acid strong cation-exchange packing with a sorbent-mass to column volume ratio of 500 mg per 3 mL, or equivalent, and elute into a 5-mL volumetric flask.
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