E. V. Vanchikova, E. M. Lapteva, N. A. Vasilyeva, B. M. Kondratenok, E. V. Shamrikova
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引用次数: 0
Abstract—
Particle size distribution (PSD) of a significant number of soil samples of various geneses from the Komi Republic was studied by the Kachinskii method (KM). Calculated, procedural, random, and systematic factors influencing the precision and correctness of measurement results performed with the KM protocol are considered. The influence of sample preparation (the degree of grinding of soil samples) and procedures for measuring the mass fraction of elementary soil particles (ESPs) on the quality of the results of studying soil PSD was assessed. The instability of measuring the mass of fine sand (0.05–0.25 mm) and coarse silt (0.01–0.05 mm) fractions with the KM protocol was shown. The dependence of the uncertainty of measurement results caused by random factors on the mass fraction of ESPs of particular size fractions is noted: the lower the mass of ESPs in the fraction, the higher the uncertainty of the measurement results. A modification of the Kachinskii method (KM) has been developed to improve the quality of soil PSD analysis. It includes: (1) separation of fine sand particles using a sieve with a mesh size of 0.05 mm (instead of calculating this fraction by difference according to the MK protocol); (2) use of scales of the first class of accuracy to measure the mass fraction of silt and clay particles; (3) control of the PSD research based on the summation of the measured values of the mass fraction of ESPs of six fractions and acid-soluble compounds (losses from HCl treatment). The standard for operational control of the mass fraction of the sum of ESPs after dividing them into fractions is 100 ± 5%. A metrological study of the Kachinskii method and its modifications was carried out. The proposed modification of Kachinskii`s method made it possible to reduce the uncertainty in the measurement results of the mass fraction of ESPs of small fractions (ωn < 10%) and shift the lower limit of measurements to 1%.
期刊介绍：
Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences.
Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.
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