• Fisher Chemical HPLC electrochemical grade ortho-phosphoric acid 85% (P/N O/0515/PB08) • EP Certified Reference Standard Thiopental for System Suitability CRS,2 containing impurities A, B, C, and D (P/N Catalogue code Y0001478) Equipment (Germering laboratory) • Vials (amber, 2 mL), Fisher Scientific (P/N 03-391-6) • Cap with Septum