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A novel binary pipette splitting sediment subsampling method for improving reproducibility in laser-diffraction

Zhixiong Shen1, Nicholas Conway1, Till J J Hanebuth1

  • 1Department of Marine Science, Coastal Carolina University, Conway, SC 29526, United States.

Methodsx
|November 10, 2021
PubMed
Summary
This summary is machine-generated.

A new binary pipette splitting (BPS) method significantly improves the reproducibility of sediment subsampling for particle-size distribution analysis. This novel approach enhances accuracy in laser-diffraction measurements for heterogeneous samples.

Keywords:
Laser diffractionSedimentologySplittingSubsampling

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Area of Science:

  • Earth Science
  • Geology
  • Sedimentology

Background:

  • Laser-diffraction is a standard method for particle-size distribution (PSD) measurement.
  • Subsampling heterogeneity in sediment analysis introduces significant uncertainty.
  • Existing subsampling methods lack control over error sources in heterogeneous sediment.

Purpose of the Study:

  • To introduce and verify a novel subsampling method for improved precision in particle-size distribution analysis.
  • To address the limitations of conventional subsampling techniques for heterogeneous wet sediment.

Main Methods:

  • Development of the binary pipette splitting (BPS) method for generating twin subsamples.
  • Application of BPS to sediment samples from ten flood-layer deposits post-Hurricane Florence.
  • Comparison of BPS precision against the conventional pipette subsampling method using median coefficient of variation (COV) for D10, D50, and D90.

Main Results:

  • The BPS method considers all suspended sediment, unlike conventional methods that sample fixed portions.
  • Median COV values for D10, D50, and D90 using BPS were 4%, 3%, and 2%, respectively.
  • These BPS COV values are substantially lower than those from conventional pipette subsampling (18%, 15%, and 13%).

Conclusions:

  • The binary pipette splitting (BPS) method significantly enhances the reproducibility of subsampling wet sediment.
  • BPS offers a substantial improvement for generating statistically identical subsamples for laser-diffraction particle-size analysis.
  • This advancement reduces uncertainty in PSD measurements of naturally heterogeneous sediment.