A comparison of some rapid techniques for the measurement of density in soft sediments



ABSTRACT Four different methods of measuring density in soft sediments have been compared with the density bottle method. Measurement of the wet sediment volume was found to be the step which limited accuracy. Use of open calibrated rings during the slicing of a core overestimated the volume. This problem could be avoided if a lid was placed on the ring during slicing, but volume measurement could still be biased by the presence of gas bubbles. Measurement of the volume of sediment after dispersion in a liquid medium was found to overestimate the volume unless the bias, introduced by difficulties in reading the final meniscus level, was subtracted from each measured volume. A cut off syringe was shown to be capable of estimating the volume of wet sediment with a high precision if reasonable precautions were taken.