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- Title
Method for estimating bulk density of soft-bottom sediment cores
- Authors
Aalderink, R. H.; Anderson, D. L.; van Dokkum, H. P.; van Leerdam, M. E.; Abbink Spaink, A. P.; Vermulst, C. J. W.
- Abstract
Soft-bottom highly porous sediment samples can be frozen to facilitate handling, preservation, and especially separation of sediment layers before laboratory analysis. Due to core expansion upon freezing, bulk density measurements are biased (underestimation of up to 8.9% for pure water), but bulk density in separate sediment layers can only be measured after freezing. Therefore, the objective of this study was to develop a methodology that allows the actual field bulk density to be estimated from measurements on frozen cores in the laboratory. Homogeneous soft-bottom undisturbed sediment cores (single layer) were sampled with a transparent cylindrical device in the Everglades Agricultural Area. The bulk density of the undisturbed, unfrozen sediment cores (field bulk density) was calculated by measurement of the volume and weight of sediment cores. After freezing, the solids fractionand frozen bulk density on a wet-basis were determined. From the collected data, the field (i.e., before freezing) bulk density could adequately be predicted from the frozen bulk density and the solids fraction. The method described in this paper allows field bulk density ofseparate sediment layers to be estimated from parameters easily measured on frozen sediment cores, and is therefore useful when differentsediment layers require delineation.
- Subjects
SEDIMENTS; SAMPLING (Process)
- Publication
Journal of Environmental Quality, 1998, Vol 27, Issue 1, p243
- ISSN
0047-2425
- Publication type
Article