Quantification of refractory organic substances in freshwaters: further insight into the response of the voltammetric method |
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Authors: | François Quentel Montserrat Filella |
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Institution: | (1) Laboratoire de Chimie Analytique, UMR-CNRS 6521, Université de Bretagne Occidentale, 6 Avenue V. Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France;(2) Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland |
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Abstract: | A recently published method for quantifying refractory organic matter (often referred to as humic substances) in freshwaters
was applied to a wide range of International Humic Substance Society (IHSS) humic compounds in order to (i) gain a better
understanding of the mechanism of the voltammetric response which is the basis of the analytical method and (ii) provide guidance
on choosing the optimal standard to be used. At the same time, the sensitivity of the technique has been increased by switching
from the pulse mode initially proposed to the square-wave mode. The results obtained show that (i) differences in adsorption
onto the electrode rather than differences in complexation strength are responsible for the differences in the intensity of
the signal obtained for the different humic compounds, (ii) carboxylate, N- and S-containing groups do not play a role in
the voltammetric signal. |
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Keywords: | Humics Fulvics Refractory organic matter IHSS SWV Mo(VI) Freshwaters |
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