Abstract
The suitability of the two more extensively used sampling techniques, namely in-situ dialysis and centrifugation followed by filtration were compared. Field measurements derived from Lake Simbirizzi, Sardegna, Italy were used for the comparison. Two groups of substances were selected; the first one consists of the relatively inert in the aquatic environment chlorides and bromides, while the second one consists of substances involved in diagenetic processes (ammonium-nitrogen and soluble reactive phosphorus). The field measurements show that for the applied sampling techniques the measurements are comparable for the first group of substances, while measurements derived by centrifugation followed by filtration give considerably different concentrations using in-situ dialysis for the second group of substances. Since the second group is related to sediment-water interactions (adsorption-desorption and chemical processes), it seems that forced separation by centrifugation influences considerably the derived measurements. As a result in-situ dialysis is expected to give more accurate measurements of porewater concentrations for nutrients and other reactive substances.
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Angelidis, T.N. (1997). Comparison of Sediment Pore Water Sampling for Specific Parameters Using Two Techniques. In: Evans, R.D., Wisniewski, J., Wisniewski, J.R. (eds) The Interactions Between Sediments and Water. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5552-6_19
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DOI: https://doi.org/10.1007/978-94-011-5552-6_19
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