Fluorescence peak integration ratio IC:IT as a new potential indicator tracing the compositional changes in chromophoric dissolved organic matter (original) (raw)

The Science of the total environment, 2016

Abstract

The present study demonstrates that the ratio of fluorescence integration of peak C to peak T (IC:IT) can be used as an indicator tracing the compositional dynamics of chromophoric dissolved organic matter (CDOM). CDOM absorption and fluorescence spectroscopy and stable isotope δ(13)C were determined on a seasonal basis in seventeen Chinese inland waters as well as in a series of mixing and photodegradation experiments in the lab. A strong positive linear correlation was recorded between IC:IT and the ratio of terrestrial humic-like C1 to tryptophan-like C4 (C1:C4) derived by parallel factor analysis. The r(2) for the linear fitting between IC:IT and C1:C4 (r(2)=0.80) was notably higher than between C1:C4 and other indices tested, including the ratio of CDOM absorption at 250nm to 365nm, i.e. a(250):a(365) (r(2)=0.09), spectral slope (S275-295) (r(2)=0.26), spectral slope ratio (SR) (r(2)=0.31), the humification index (HIX) (r(2)=0.47), the recent autochthonous biological contributi...

Xiangming Tang hasn't uploaded this paper.

Let Xiangming know you want this paper to be uploaded.

Ask for this paper to be uploaded.