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RP-HPLC-ICPMS chromatograms of the unspiked and spiked CRM 7405-a (Hijiki) after extraction with DCM/MeOH (2 + 1; 5 mL), silica cleanup, and thio conversion. ZORBAX Eclipse XDB-C8 (4.6 × 150 mm, 5 μm); mobile phase, water/ethanol gradient (70–90% EtOH, incl. 0.1% formic acid); flow rate, 1 mL min–1; column temperature, 30 °C; injection volume, 20 μL.
