中国一些岩类中硒的比较研究

用荧光分光光度法分析了114个岩样和陆架沉积物中的微量硒.样品基本覆盖我国地表主要岩类.硒在样本空间呈不规则多重全域分布,经模式校正,所得岩浆岩硒值高于美国标准岩样,而沉积岩硒值明显偏低,据此推算了硒的区域丰度值以及我国地表成土母质硒含量的阈值下限.

A COMPARATIVE STUDY OF SELENIUM CONTENT IN CHINESE ROCKS

The results of nanogram amount of selenium in Chinese rocks determined by SPF are reported in this paper. The samples were collected from over 100 sites and covered fourteen species. The rook selenium contents range from 0.011 to 0.267 mg/kg with & multiple population distribution pattern. After model calibration the average selenium contents were found to be 0.070mg/kg in igneous rocks and 0.056mg/kg in sedimentary rocks, and a value of 0.073 mg/kg was calculated as a geological abundance. A direct relationship between selenium contents in rocks and soils derived from the rocks was confirmed. A value of 0.046 mg/kg was suggested as a bottom threshold of selenium in Chinese rocks.