Fig. 6.

A) 2D-DET scan. The dashed line represents the sediment/air interface. B) Standardized ammonium distribution in false color scale (μM). C) Comparison between results obtained from pore water extraction coupled to spectrophotometric analyses (squares, diamonds and circles) and a profile calculated using the average value of each pixel line of the 2D-DET scan. D) Relation between the average concentrations in ammonium (μM) measured in the three cores and the average concentrations in ammonium (μM) found in the gel using rectangles of similar sizes than core slices. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)