Abstract
The spatial evolution of colloids from a drained peat bog to a river was studied in a karstic watershed (Jura Mountains, Switzerland) by bulk chemistry and electron microscopy. Raw waters (peat bog pore water, water from artificial drains and river water) were analyzed using ICP (Fe, Ca), Colorimetry (Fe 2+), TOC and UV (organic matter) and analytical electron microscopies (TEM-EDS, STEM-EDS, EF-TEM). Microscopic analyses correlate bulk sample results and highlight interesting features at the level of the individual colloids. In the peat, TEM-EDS shows the presence of individual globular entities made of carbon (0.4 to 1 μm), while in the river STEM-EDS reveals Fe-Ca-rich globular colloids with a core of carbon determined by EF-TEM. In parallel, bulk chemical analyses show that the ratio [Fe 2+]:[Fe] tot decreases from the peat to the river as an inverse function of pH and [O 2], while [Ca 2+] increases. We may thus postulate that Fe-Ca-C rich entities found in the river originate from the oxidation of Fe 2+ and adsorption of Ca 2+ at the surface of organic colloids, as they are transported by drains from the peat to the river.
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