The ∑REE in Ioesses of different ages in the Luochuan section shows a narrow range of variation, indicating the homogeneity of materials in chemical composition. The REE in loess are concentrated mainly in silt.sized...The ∑REE in Ioesses of different ages in the Luochuan section shows a narrow range of variation, indicating the homogeneity of materials in chemical composition. The REE in loess are concentrated mainly in silt.sized detrital minerals. Loesses of different ages and paleosols all are relatively enriched in rare-earth elements of the Ce family, and show similar REE distribution patterns. The fractinnatlon among various REEs in the loess is different from that in morainic, marine and lacustrine sediments,but is similar to that in sand samples from deserts in Northwest China. The ratios of Ce/Ce^* and Eu/Eu^* reflect that the provenance of loessic materials and their accumulating area are all in an oxidation environment with weakly basic mediums under arid or sub-arid climate.展开更多
Quantitative analysis of Apollo-17 mare basalt (70017-291) was carried out for its containing 26 elements by instrumental neutron activation technique with the rock standard BCR-1 prepared by the U.S. Geological Surve...Quantitative analysis of Apollo-17 mare basalt (70017-291) was carried out for its containing 26 elements by instrumental neutron activation technique with the rock standard BCR-1 prepared by the U.S. Geological Survey as the multielement irradiation standard. For most of the elements, the analytical error is confined to + 10%. A comparison was made of the analytical results with those obtained from Apollo-11 and Apollo-12 mare basalt samples.展开更多
Coal is now still the main energy resource in China. But the burning of this fossil fuel is also a major source of air pollution. Thus it is quite obvious that an accurate knowledge of the elements, including the trac...Coal is now still the main energy resource in China. But the burning of this fossil fuel is also a major source of air pollution. Thus it is quite obvious that an accurate knowledge of the elements, including the trace ones. of coal is important. But to secure such a knowledge, reliable determination techniques are needed. To test the accuracy of analytical methods and quality control for the determination of the composition of coal and flyash, there is an obvious need for some environmental standard reference materials. Recently the U.S. National Bureau of Standards has announced such a material, coal (SRM-1632a).展开更多
The distribution and behavior of rare earth elements (REE) in soils is not well known. In this paper their distribution in soils was discussed on the basis of analytical data of ten soil samples from Guangzhou. Four o...The distribution and behavior of rare earth elements (REE) in soils is not well known. In this paper their distribution in soils was discussed on the basis of analytical data of ten soil samples from Guangzhou. Four of these samples are red soils derived from granites and the rest six ones are derived from sediments and sedhnentary rocks. The sedimentary ones include two paddy soils derived from recent river deposits, two purple soils derived from red beds, one red soil derived from sandstone, and one terra rossa derived from limestone. Ten REE (La, Ce, Pr,展开更多
文摘The ∑REE in Ioesses of different ages in the Luochuan section shows a narrow range of variation, indicating the homogeneity of materials in chemical composition. The REE in loess are concentrated mainly in silt.sized detrital minerals. Loesses of different ages and paleosols all are relatively enriched in rare-earth elements of the Ce family, and show similar REE distribution patterns. The fractinnatlon among various REEs in the loess is different from that in morainic, marine and lacustrine sediments,but is similar to that in sand samples from deserts in Northwest China. The ratios of Ce/Ce^* and Eu/Eu^* reflect that the provenance of loessic materials and their accumulating area are all in an oxidation environment with weakly basic mediums under arid or sub-arid climate.
文摘Quantitative analysis of Apollo-17 mare basalt (70017-291) was carried out for its containing 26 elements by instrumental neutron activation technique with the rock standard BCR-1 prepared by the U.S. Geological Survey as the multielement irradiation standard. For most of the elements, the analytical error is confined to + 10%. A comparison was made of the analytical results with those obtained from Apollo-11 and Apollo-12 mare basalt samples.
文摘Coal is now still the main energy resource in China. But the burning of this fossil fuel is also a major source of air pollution. Thus it is quite obvious that an accurate knowledge of the elements, including the trace ones. of coal is important. But to secure such a knowledge, reliable determination techniques are needed. To test the accuracy of analytical methods and quality control for the determination of the composition of coal and flyash, there is an obvious need for some environmental standard reference materials. Recently the U.S. National Bureau of Standards has announced such a material, coal (SRM-1632a).
文摘The distribution and behavior of rare earth elements (REE) in soils is not well known. In this paper their distribution in soils was discussed on the basis of analytical data of ten soil samples from Guangzhou. Four of these samples are red soils derived from granites and the rest six ones are derived from sediments and sedhnentary rocks. The sedimentary ones include two paddy soils derived from recent river deposits, two purple soils derived from red beds, one red soil derived from sandstone, and one terra rossa derived from limestone. Ten REE (La, Ce, Pr,
