The zero-crossing first-derivative technique has been applied to both normal and synchronous spectrofluorimetry and has allowed the resolution of a binary mixture of the alkaloids cinchonine and quinidine. The calibration graphs were linear in the concentration range 0.14–0.73 µmol l–1 of quinidine and 2.9–7.3 µmol l–1 of cinchonine.
M. Mariaud, P. Dubois and P. Levillain, Analyst, 1988, 113, 929 DOI: 10.1039/AN9881300929
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