• 论文 •

### 松辽平原土壤中稀土、铀和钍等微量元素的环境背景值

1. 中国科学院高能物理研究所, 北京
• 出版日期:1987-07-20 发布日期:1987-07-20

### THE ENVIRONMENTAL BACKGROUND VALUES OF REE, U AND Th IN SOILS OF THE SONGLIAO PLAIN

Wang Yuqi, Sun Jingxin, Tu Shude, Zhang Yuanji

1. Institute of High Energy Physics, Academia Sinica, Beijing
• Online:1987-07-20 Published:1987-07-20

Abstract: In this paper, the contents of REE (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu),U and Th in the soils of the Songliao Plain were determined by NAA. The types of frequency distribution of concentrations for these elements were tested. The background values of 8 REE, U and Th were given.In addition, the concentrations and distribution characteristics of REE, U and Th in diff crent types of soil in this area have been also discussed.These soils are black soft, chernozem, meadow soil, brown earth, dark soft, chestnut soft, dark brown earth and lessive. The results obtained show that the contents of 8 REE, U and Th in soils of the Songliao Plain are generally close to those of world’s soil. The average value of the total REE in soil of this area is 172 ppm. The standard deviation is ±19.6 ppm and the coefficient of variation is 0.114. After normalized by mean values of chondrite, the REE patterns for different main group soils are very similar to each other, as well as to those of typical North America shales, all with negative slopes. The background values of U and Th in this area are 2.34 and 1.08 ppm, respectively. These values are also close to those of world’s soil and the average abundance of the crust. The ratio of Th and U is 4.6.