Abstract
The effect of several buffers was examined for the catalysis of copper(II) in the reaction of N,N-dimethyl-p-phenylenediamine with N,N-dimethylaniline to form Bindschedler’s Green (λmax=725 nm) in the presence of hydrogen peroxide. The buffer agents which were examined included imidazole, 2,4,6-trimethylpyridine (TMP), piperazine-N, N-bis(2-ethanesulfonic acid) (PIPES), N,N-bis(24iydroxyethyl)-2-aminoethanesulfonic acid (BES), 3-(N-morpholino)-propanesutfonic acid (MOPS), and N-2-hydroxyethylpiperazine-N’-2-ethanesulfonic acid (HEPES). Among them TMP was found to be the most favorable agent in this reaction system. The established catalytic method is given for the 0.05 - 1.0 ngcm-3 range of copper(II), and has an effective sensitivity index of 1.1×10-3 ng cm-2.
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Nakano, S., Hayashi, M. & Kawashima, T. Determination of Nanogram Amounts of Copper(II) by the Catalytic-Photometric Method. ANAL. SCI. 9, 695–699 (1993). https://doi.org/10.2116/analsci.9.695
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DOI: https://doi.org/10.2116/analsci.9.695