Abstract
The dynamometer method of determining particle size distribution was developed several years ago. The principles of sample preparation for this method are based on those used in other sedimentation methods. With improvements in these procedures, an investigation of the effect on obtained particle size distribution results by removing organic matter using hydrogen peroxide was proposed. For this purpose, the particle size distributions were determined in 50 soil samples with varying organic matter content, before and after organic matter removal. A comparative analysis of the results, including calculation of the Euclidean distance, was performed on both groups. It was found that differences in the particle size distributions of the soils after the application of hydrogen peroxide were difficult to predict, and irregular in both magnitude and direction. However, in light soils, the process of organic matter removal caused an increase in the clay fraction at the expense of the silt fraction, which decreased. In soils with a higher initial clay fraction, there were decreases in the clay and sand fractions, while the silt fraction increased.
Highlights
The particle size distribution is the most important property of soil
Changes in the particle size distribution of soils due to the removal of soil organic matter (SOM) using 30% hydrogen peroxide were irregular in both magnitude and direction
In light soils was it found that the SOM removal process caused an increase in the clay fraction and a decrease in the silt fraction
Summary
The particle size distribution is the most important property of soil. Over the past. 100 years, several different sedimentation methods have been developed to determine soil particle size distributions [1,2]. The determination of particle size distributions using sedimentation methods requires the appropriate preparation of the soil samples. The authors attempted to determine the extent to which the organic matter removal process affects the results obtained using the dynamometer method. It was checked whether the dynamometer method differed from the other sedimentation methods in this respect, and whether the amount of organic matter in soil samples significantly affects the results of the analysis of particle size distribution using the dynamometer method
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