Use of fluorescence spectroscopy and voltammetry for the analysis of metal-organic matter interactions in the New Caledonia lagoon

A groundbreaking analysis of the Lagoons of New Caledonia reveals how organic matter (OM) interacts with metals such as Ni, Zn, Pb, Cu, and Cd, providing critical insights into both natural and anthropogenic pollution sources. By combining fluorescence spectroscopy, polarography, and potentiometry, researchers determined the conditional stability constants of OM-metal complexes, enabling predictions about metal pollution's fate in the lagoon. This study also distinguished between terrigenous (natural) and anthropogenic OM origins for the first time, using advanced geochemical modeling with discrete pKa distributions. The findings underscore the sensitivity of nearby coral reef biocenosis to these metal complexes, which originate from nickel extraction and coastal erosion, offering a novel framework for understanding and mitigating environmental impacts on this UNESCO World Heritage Site.

Merdy, P., Bonnefoy, A., Martias, C., Garnier, C., & Huclier, S. (2012). Use of fluorescence spectroscopy and voltammetry for the analysis of metal-organic matter interactions in the New Caledonia lagoon. International Journal of Environmental Analytical Chemistry, 92(7), 868–893. https://doi.org/10.1080/03067319.2010.520317