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Lecture 21 HPLC-2 Instrumentation Injector Column Chromatograph Data Processing Detector Percentage of solvents having the same eluent strength B- acetonitrile CH3CN t r2 t r2 N 16 2 constant constant 2 W W tr constant W Width W is proportional to retention time tr ‘general chromatography problem’ Solution of GNP: gradient Pump 4.5 mm2 HPLC columns of different length Injector Detectors UV cell Derivatization in HPLC Evaporative LightScattering Detector Electrochemical detection of alcohols in water HO 1 OH HO 2 3 CH3OH 4 HO HO CH3CH2OH OH 5 OH 6 OH OH 7 OH HO 13 O 14 8 2-butanol 9 2-Methyl-1-propanol 10 1-butanol 11 3-methyl-1-butanol 12 1-pentanol Chemistry: Oxidation of alcohols @Au electrode OH MS Detector