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vol. 7, nr. 2 (2006)
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Analysis of the accuracy of single-kernel density measurements made with a simple experimental set-up
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Ryszard Siuda, Mikołaj Rozwadowski
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Institute of Mathematics and Physics, Technical and Agricultural University, ul. S.Kaliskiego 7, 85-796 Bydgoszcz, Poland |
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vol. 7 (2006), nr. 2,
pp. 477-485
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abstract:
An experimental set-up consisting of a commercial electronic microbalance and a home-made air micropycnometer was used for the determination of single-kernel (SK) density of wheat grain via SK mass and volume measurements. The measurements were made for two representative samples taken from two lots of wheat grain differing in mean mass (45.3 and 30.4 mg). It was found that results obtained for SKs of lower mass were considerably affected by measurement inaccuracy (up to ca. 15% of the density for the lightest kernels). This effect can be removed by an appropriate procedure. Corrected results showed that mean density for kernels from the sample of massive kernels was lower (1.282 g cm–3) than for the sample of light kernels (1.363 g cm–3). Kernels from both samples showed linear increase of SK density with mass (the slope of the dependence was ca. 0.0017 g cm–3 mg–1). Corrected standard deviation from the linear dependence was larger for lighter kernels (0.066 and 0.041 g cm–3, respectively) and was noticeably reduced compared to the value before correction for measurement inaccuracy (0.100 and 0.047 g cm–3, respectively).
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keywords:
single-kernel density, single-kernel mass, single-kernel volume, single-kernel physical properties
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original in:
Polish
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