Novel catalytic oxidative coupling reaction of N,N-dimethyl-p-phenylenediamine with 1,3-phenylenediamine and its applications to the determination of copper and iron at trace levels by flow injection technique
S. Lunvongsaa, T. Takayanagia, M. Oshimaa and S. Motomizu, a,
Analytica Chimica Acta
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http://dx.doi.org/10.1016/j.aca.2006.06.011