摘要
沉积岩中黄铁矿的含量和硫同位素组成研究可以用于判断沉积环境特征,反演成岩成矿过程。设计了一套多通道的黄铁矿硫提取装置,确定了装置的加热温度为130℃,实验时间为2h,优化了实验流程,实现一次提取同时满足黄铁矿含量及其同位素组成测定需要。采用亚甲基蓝分光光度法测定硫含量和元素分析仪-气体同位素质谱法测定黄铁矿硫同位素组成。亚甲基蓝分光光度法的标准曲线的线性相关性R^(2)=0.9999,黄铁矿样品的加标回收率介于94%~100%之间,10次测量的相对标准偏差为1.9%。黄铁矿经过铬还原法提取生成的硫化银的硫同位素组成的测试结果和本身的测试结果在误差范围内一致,精度≤0.2‰,可以满足沉积岩中黄铁矿硫同位素测试需求。
The study of pyrite content and its sulfur isotope composition in sedimentary rock can be used to judge the characteristics of sedimentary environment and reversely deduct the information of diagenesis and mineralization.A set of multi-channel pyrite sulfur extraction device were designed.The heating temperature of the device was determined to be 130℃,and the experiment time was 2 hours.Only one extraction experiment is needed to determine the sulfur content by methylene blue spectrophotometry and the sulfur isotope composition of pyrite by element analyzer gas isotope mass spectrometry.The R^(2) of the standard curve of methylene blue spectrophotometry was 0.9999,the recovery rate of pyrite sample was 94%~100%,and the relative standard deviation of 10 measurements was 1.9%.The test results of the sulfur isotope composition of silver sulfide transformed from pyrite through chromium reduction extraction were consistent with the test results of original pyrite within the error range,and the accuracy was less than 0.2‰,which can meet the First author:HAN Juan,female,born in 1986,deputy senior sulfur isotope test requirements of pyrite sulfur in sedimentary rock.
作者
韩娟
刘汉彬
金贵善
张建锋
石晓
李军杰
张佳
刘小桐
HAN Juan;LIU Hanbin;JIN Guishan;ZHANG Jianfeng;SHI Xiao;LI Junjie;ZHANG Jia;LIU Xiaotong(Beijing Research Institute of Uranium Geology,Beijing 100029,China)
出处
《世界核地质科学》
CAS
2024年第1期73-81,共9页
World Nuclear Geoscience
基金
核能开发项目(编号:测HTLM2101-06)资助。
