1991 Volume 43 Issue 4 Pages 298-302
The accuracy of grain size analysis using conventional sieving methods was examined by detecting the experimental errors of this analysis. For the purpose of this examination, 36 samples were collected from a 15cm square area which cited on the surface of a coastal sand dune and were considered to have the same grain size characteristics each other.
Grain size analysis was done on these 36 samples by common methods (Table 1) and the resulting of this analysis, some scattering ranges were recognized on each statistical parameters as mean diameter, sorting and skewness. These scattering ranges could be presented by using the values of 2 times of standard deviation (2σ) around the averaged value of each parameters (Fig. 1). Then the experimental errors in this analysis could be expressed by using the value of 2σ. They were 0.06∅ for mean diameter, 0.03∅ for sorting and 0.21∅ for skewness in ∅ scale.