Spectrophotometric determination ofo- andp-phenylenediamines

Summary Cupric chloride-triphenylphosphine complex gives red color witho-phenylenediamine having maximum absorption at 505–520 nm and 0.5µg/ml as visual limit of identification. The reaction is specific foro-phenylenediamine and obeys Beer's law (1 to 10µg/ml). This reaction provides the basis of a new method for the Spectrophotometric determination ofo-phenylenediamine inµg quantities.