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为了获取适用于土壤中原生矿物的简便、快捷且误差较小的定量分析方法,基于X-射线衍射技术并利用强度比例因子法的基本原理,对钾长石-黑云母-石英组合中三种矿物共存或其中任意两种矿物组合的情形进行了定量研究,建立了9个定量计算公式。对于钾长石-黑云母组合,f%=(If/Ib)/(If/Ib+1.4255)×100%,b%=(Ib/If)/(Ib/If+0.9058)×100%;对于钾长石-石英组合,f%=(If/Iq)/(If/Iq+0.3241)×100%,q%=(Iq/If)/(Iq/If+3.5623)×100%;对于黑云母-石英组合,b%=(Ib/Iq)/(Ib/Iq+0.5590)×100%,q%=(Iq/Ib)/(Iq/Ib+1.8705)×100%;对于钾长石-黑云母-石英组合,f%=If/(If+1.2333Ib+0.5508Iq)×100%,b%=Ib/(Ib+1.1962If+0.4966Iq)×100%,q%=Iq/(Iq+2.7251If+2.5427Ib)×100%。计算结果表明,无论是钾长石还是黑云母和石英,其实测值与真实值之间的相关性均很好:对于黑云母-石英组合,相关系数(r)为0.99;对于钾长石-石英组合和钾长石-黑云母组合,r均为0.96;对于钾长石-黑云母-石英组合,三种矿物实测值与真实值之间的r分别为0.88、0.93和0.92。所建立的方法之误差也较小:对于钾长石-黑云母、钾长石-石英和黑云母-石英组合,平均误差分别为6.9%、5.5%和3.2%;对于三元矿物组合,钾长石、黑云母和石英的平均误差则分别为8.4%、6.5%和6.7%。
In order to obtain a simple, rapid and error-less quantitative analysis method suitable for primary minerals in soil, based on the X-ray diffraction technique and the basic principle of intensity scale factor method, three kinds of K feldspar-biotite- Mineral coexistence or any combination of two of them were studied quantitatively and nine quantitative formulas were established. F% = (If / Ib) / (If / Ib + 1.4255) × 100%, b% = (Ib / If) / (Ib / If + 0.9058) × 100% for the K-feldspar- F = (If / Iq) / (If / Iq + 0.3241) × 100%, q% = (Iq / If) / (Iq / If + 3.5623) × 100% - quartz combination, b% = (Ib / Iq) / (Ib / Iq + 0.5590) × 100%, q% = (Iq / Ib) / (Iq / Ib + 1.8705) × 100% Mica-quartz combination, f% = If / (If + 1.2333Ib + 0.5508Iq) × 100%, b% = Ib / (Ib + 1.1962If + 0.4966Iq) × 100%, q% = Iq / (Iq + 2.7251 If + 2.5427Ib) × 100%. The calculated results show that there is a good correlation between the measured value and the true value, no matter whether it is potassium feldspar or biotite and quartz: the correlation coefficient (r) is 0.99 for the biotite-quartz combination; for the K-feldspar- Quartz assemblage and potassium feldspar-biotite assemblage, respectively, with r of 0.96; for the K-feldspar-biotite-quartz combination, r between the measured and the true values of the three minerals were 0.88, 0.93 and 0.92, respectively. The error of the established method is also small: the average errors for the K-feldspar-biotite, K-feldspar-quartz and biotite-quartz combination are 6.9%, 5.5% and 3.2%, respectively; for the ternary mineral combination, the K The average errors of feldspar, biotite and quartz were 8.4%, 6.5% and 6.7%, respectively.