相指标分析中黄铁矿中铁的直接测定

一般从测定硫(全硫与硫酸盐硫差值)着手换算黄铁矿中铁。这样没有考虑岩石中自然硫、有机硫和其他形式硫化物存在的影响,且操作烦琐、劳动强度大、成本高。若岩石中有较多的盐酸不溶或难溶硫酸盐(如重晶石、明矾石、石膏等)时,则测定更加困难。为此,我们从铁着手,进行了直接测定黄铁矿中铁的试验。 本法采用1:1盐酸和1:1磷酸的混和酸分离可溶铁(Fe_2O_3);残渣以1:1硝酸溶解测定黄铁矿中铁(FeOFes_2)的含量。

Variability and correlation analysis of physical and mechanical indexes of loess in western Liaoning

Based on the method of probability and statistics, the authors analyzed the physical and mechanical properties of loess in specified area, and discussed its main indexes, the coefficient of variation, and the corre- lation among the physical and mechanical indexes. Regression equations are built among those indexes, the re- suits show that the variability of mechanical indexes is higher than that of the physical indexes, and the physical indexes have better correlation than the relation between physical and mechanical indexes. The conclusions of this study would contribute to further research about loess in western Liaoning.