Rapid spectrophotometric determination of trace copper impurity in N,N'-di(2-butyl)-p-phenylenediamine.
The trace copper is separated from the matrix by extraction of the latter (an antioxidant of N-alkylated p-phenylenediamine type) from ammoniacal medium and then determined spectrophotometrically.
Gupta
J K
JK
Petrochemistry Division, Indian Institute of Petroleum, Dehradun 248005, U.P., India.