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Differential pulse polarographic assay of the antineoplastic agent cis-dichlorodiamineplatinum II and its analogues was performed after acid oxidative hydrolysis (HClO4, HNO3, HCl) of biological samples (plasma, tissue homogenates, urine) and reaction with ethylenediamine. Platinum levels and kinetics were determined in blood and urine of patients with non-oat-cell lung carcinoma. Detection limit of the polarographic assay was 0.5 ng platinum; analytical error was +/- 3%. Levels of free cis-dichlorodiamineplatinum (II) in plasma fell in samples stored at -20 degrees C; the half-life of free drug was 38 h.
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