【摘要】：對(duì)于微量沉積物,利用掃描電鏡獲得的顆粒圖像統(tǒng)計(jì)粒度參數(shù)是一條有效的途徑,但需要解決被統(tǒng)計(jì)顆粒的最小樣本量這一基本問(wèn)題。使用北京市區(qū)降塵、中國(guó)北方的淡黑鈣土和栗鈣土3種微量樣品,利用S-4800型掃描電鏡獲得的圖片,對(duì)顆粒平均粒徑、標(biāo)準(zhǔn)差和標(biāo)準(zhǔn)誤,以及偏度和峰態(tài)等粒度參數(shù)進(jìn)行了統(tǒng)計(jì)分析,旨在確定不同平均粒徑的微量樣品的最小統(tǒng)計(jì)樣本量。結(jié)果表明:對(duì)于平均粒徑約25μm的降塵樣品,最小樣本量為800;平均粒徑100μm的淡黑鈣土,最小樣本量為1 100;平均粒徑約180μm的栗鈣土,最小樣本量為1 200。
[Abstract]:For trace sediments, the statistical particle size parameters obtained by SEM is an effective approach, but the basic problem of the minimum sample size of the particles to be counted should be solved. The average particle size, standard deviation and standard error were obtained by using S-4800 scanning electron microscope (SEM) with three trace samples of calcareous soil and chestnut soil from northern China. The statistical analysis of the particle size parameters such as bias and peak state is carried out in order to determine the minimum statistical sample size of trace samples with different average particle sizes. The results show that the minimum sample size is 800 for dust sample with average diameter of 25 渭 m, 1 100 for calcareous soil with average diameter of 100 渭 m, and 1 200 for chestnut soil with an average diameter of 180 渭 m.
【作者單位】： 河北師范大學(xué)資源與環(huán)境科學(xué)學(xué)院;北京師范大學(xué)地表過(guò)程與資源生態(tài)國(guó)家重點(diǎn)實(shí)驗(yàn)室/防沙治沙教育部工程研究中心;
【基金】：國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(41330746)
【分類(lèi)號(hào)】：S151.9;X831
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本文編號(hào)：2251174