Abstract
Chemical analysis of suspended particulate matter in marine waters gives insight into important geochemical processes. Additionally, fjords offer suitable locations to study these processes. The Bunnefjord in south-east Norway was selected for a 1-year study of the vertical and seasonal variations in the particulate matter chemistry. Analysis of particulate Al, Si, P, Fe and Mn on Nuclepore membrane filters by X-ray fluorescence spectrometry elucidates the distribution of various particulate matter phases in the water column. While particulate Al, Si and P are abundant above the halocline due to the influence of river water (Al), diatoms (Si) and organic matter (P), particulate Fe and Mn phases preferentially occur in the lowoxygenated bottom water. The latter is a result of redox reactions at or near the sediment-water interface. The mobility of Mn is particularly well demonstrated, showing a rapid loss of Mn from the sediments when the oxygen concentration in the bottom water dropped below 1 ml l−1. The flux of Mn from the sediments to the water and the conversion of dissolved Mn to a particulate phase was estimated to a minimum of 0·7 μg cm−2 day−1.
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