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Journal of the Brazilian Chemical Society

Print version ISSN 0103-5053

Abstract

LOMBARDI, Ana T  and  JARDIM, Wilson F. Synchronous-scan fluorescence and the complexation of copper (II) ions by humic substances. J. Braz. Chem. Soc. [online]. 1997, vol.8, n.4, pp.339-342. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50531997000400004.

Two fluorescence bands were detected using synchronous-scan fluorescence on samples of terrestrially derived humic substances (lex/lem 380/398, 440/458 nm) without the addition of copper. A third band (lex/lem 502/520 nm) was detected after severe quenching of the second band (lex/lem 440/458 nm) caused by additions of copper. A more energetic band (lex/lem 333/351 nm) is present in marine DOM, but absent in the terrestrial material. The effects of copper on both the intensity and shape of the synchronous-scan fluorescence spectra and this technique’s potential use as a tracer are discussed.

Keywords : fluorescence; humic substances; quenching.

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