1959 **Abstract:** The particle size distributions of various powdered substances as measured by a microscopic electronic sizing and counting technique and by an automatized liquid sedimentation balance are shown to exhibit log normal distribution behavior. The results of these two independent methods are shown to agree with the predicted values based on the transformations involving log normal distribution behavior. Screen analysis is critically evaluated. The geometric mean diameters on a weight basis, Mg, for the samples inve…

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“…6 to obtain -5µ and M¡ = 19µ. Equation 7becomes P = 50 -100/ erf ( ^) -100(1 -/) erf (^) (8) where / is the fraction fi. The next step is to get a first approximation of and 2 from the asymptotes of the experimental points and compute the value of / at various values of P. If the value of / turns out to be independent of P and x, then the estimated values of and 2 are accurate.…”

confidence: 99%

“…6 to obtain -5µ and M¡ = 19µ. Equation 7becomes P = 50 -100/ erf ( ^) -100(1 -/) erf (^) (8) where / is the fraction fi. The next step is to get a first approximation of and 2 from the asymptotes of the experimental points and compute the value of / at various values of P. If the value of / turns out to be independent of P and x, then the estimated values of and 2 are accurate.…”

confidence: 99%

“…Hence, data taken by microscope or light scattering techniques can easily be converted from the distribution by number to the distribution by mass. The validity of this transformation has been experimentally verified by Ames et al 3 The mass median diameter (D m ) is the diameter corresponding to 50% on the cumulative size distribution plot or the diameter at which 50% of the population by mass is greater than and 50% less than. The geometric standard deviation (a g ) is a measure of the spread of the distribution or the slope of the log normal line.…”

confidence: 91%

“…However, chromatography may be combined with a spectrophotometric analysis to effect a rapid and accurate determination. The lead alkyls are separated by a chromatographic column, individually collected in iodine scrubbers, and measured by a dithizone spectrophotometric lead analysis procedure (1,8,4).…”

confidence: 99%

“…The electron photomicrographs were counted and sized (size corrected for magnification) using a Cintel flying spot particle resolver manufactured by Cinema Television, Ltd., London (1,11). In all determinations, a total of at least 2000 particles were counted and sized to give the number-size dis- tribution.…”

mentioning

confidence: 99%