This document specifies an analytical method by spectrophotometry, for determining the plutonium concentration in nitric acid solutions, with spectrophotometer implemented in hot cell and glove box allowing the analysis of high activity solutions. Commonly, the method is applicable, without interference, even in the presence of numerous cations, for a plutonium concentration higher than 0,5 mg·l–1in the original sample with a standard uncertainty, with coverage factork= 1, less than 5 %.All current amendments available at time of purchase are included with the purchase of this document.