Abstract
The suitability of the dialysis technique for the close interval sampling of total dissolved mercury (Hg) in interstitial waters was evaluated through field tests conducted in flooded soils of two hydroelectric reservoirs, as well as in lake sediments and peat bogs. In these shallow water and weakly contaminated environments, we have demonstrated that peepers offer simplicity and yield more consistent results when compared with the squeezed sediment technique; that the presence of O2 in the initial filling solution does not significantly influence total dissolved Hg concentrations, [Hgtot]D, in samples collected from anoxic environments; and that an equilibration period of 8 to 9 days yields slightly less variable results than one of 6.5 days. Using the dialysis technique, we were able to generate close interval vertical profiles of [Hgtot]D, in interstitial waters. A comparison of preliminary results indicates that [Hgtot]D in porewaters collected in both artificial and natural systems are similar and independent of the sampling environment, the depth of the overlying water column, and the history of reservoir impoundment.
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Montgomery, S., Mucci, A. & Lucotte, M. The application ofin situ dialysis samplers for close interval investigations of total dissolved mercury in interstitial waters. Water Air Soil Pollut 87, 219–229 (1996). https://doi.org/10.1007/BF00696838
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DOI: https://doi.org/10.1007/BF00696838