Methodical and technical aspects of determination of granulometric composition of sandy soil samples under assistant assistant
Abstract
The aim of the study was to show the procedure for measuring on a laser diffraction analyzer of Mastersizer 3000E particles from Malvern Instruments with liquid dispersing module Hydro EV and the influence of adjustment parameters on the results of particle distribution by fractions in the sand sample. Methods. The sand sample was measured by standardized sieve-pipette method and laser diffraction method with different settings, statistical comparison of the obtained data. Results. The reproducibility test confirmed the possibility of measuring on a laser diffractometer sand sample within the error of the instrument. Adjustment parameters affect the distribution of particles by fractions. The pump speed with the stirrer for Mastersizer 3000E with Hydro EV should be in the range of 1750–2500 rpm. With an increase in refractive index from 1.33 to 1.55, the content of physical clay (particles <0.01 mm) decreases. Refractive index and absorption index there are interrelated optical indicators. If we take less value of the refractive index, then to obtain data on physical clay by laser diffraction method close to the sieve-pipette method, it is necessary to increase the absorption index. Conclusions. When working on a laser particle analyzer should take into account its design features. Particular attention should be paid to the establishment of optical parameters of the sample: the refractive index and the absorption index, because their value significantly affects the distribution of particles by fractions. Measuring by laser diffraction method at a refractive index of 1.40 and an absorption index of 0.01, or 1.41 and 0.0075, or 1.42 and 0.005, or 1.43 and 0.0025, respectively, we have the value of the fraction in the same range as in the sieve-pipette method (3.12 ± 0.6%). For the sand sample, the refractive index should not exceed 1.44. In the future, when analyzing a certain type of soil on a laser diffractometer should use its inherent optical parameters.
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