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Critical Evaluation of the Use of Laser Diffraction for Particle-Size Distribution Analysis

^a Dep. of Land, Air, and Water Resources, University of California, Davis, CA 95616
^b Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization (ARO), The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

View larger version (21K): [in a new window]   Fig. 1. Effects of the real part of the refractive index (nr) on the volume percent of (a) clay, (b) silt, and (c) sand in the Auberry, Yolo, and Clear Lake soils.

View larger version (22K): [in a new window]   Fig. 2. Laser diffraction derived size frequency distribution (presented as volume percentage) of particles in the clay-size fraction for different values of the real part of the refractive index (nr) in (a) Clear Lake and (b) Yolo soils.

View larger version (23K): [in a new window]   Fig. 3. Effects on the size frequency distribution (presented as volume percentage) of particles in the clay-size fraction of assigning different values for the real part of the refractive index (nr) for the regular laser beam and the polarization intensity differential of scattered light (PIDS) system. (a) Auberry, (b) Yolo, and (c) Clear Lake soils.

View larger version (37K): [in a new window]   Fig. 4. Comparison of (a) clay, (b) silt, and (c) sand fractions obtained by the pipette (mass percentage) and the laser diffraction (volume percentage) methods for our 42 soils. The three soils marked with a filled symbol are Auberry (A), Yolo (Y), and Clear Lake (CL).