地气测量在内蒙老羊壕金矿区的某些试验成果   总被引：3，自引：0，他引：3  

史长义  张金华  刘应汉  黄笑梅  黄增芳 《物探与化探》1997,(4)

以内蒙老羊壕金矿区为试验基地 ,引进抽气法地气测量 ,探讨了地气测量在内蒙干旱荒漠区寻找浅覆盖区隐伏金矿床的有效性。并以试验资料为依据 ,初步探讨了抽气法地气测量中的若干问题 ,指出了抽气法地气测量中存在微尘颗粒干扰。对寻找隐伏金矿床的多元素地气测量 ,采用经 0 .2 2 μm微孔滤膜过滤泡沫塑料吸附为好。已有资料显示可能有超微粒 (接近纳米级 )物质自深部矿体迁移上来  相似文献   

Trends In U.S. Hazardous Materials Transportation Spills     

Susan L. Cutter  Minhe Ji 《The Professional geographer》1997,49(3):318-331

This paper examines historical and spatial trends in hazardous materials transportation spills from 1971 to 1991. While the number of spills Inc.reased steadily during the 1970s, peaking in 1978–1979, there has been a decline in frequency sInc.e then largely due to modifications in reporting. Monetary damages have the opposite temporal pattern, with major Inc.reases recorded from 1982 onward. Death and injury statistics are more variable. Spatially, accidents are more prevalent in the Rust Belt extending from the Northeast corridor westward to the Great Lakes states, as well as in the Southeast. The greatest potential risk to the public is found in smaller, more densely populated industrial states such as New Jersey, Delaware, and Maryland. The spatial distribution, however, has not changed. Potential risk sources (e.g., chemical industry, number of hazardous waste facilities, number of railroad miles) are the best predictors of hazmat Inc.ident frequency. Mitigation efforts (statewide regulatory and/or management policies) also help explain the variability in hazmat Inc.idents.  相似文献   

Li2O—B2O3功能材料体系研究概述     

谢贤宁  高海春 《盐湖研究》1996,4(1):73-80

本文介绍了碱金属硼酸盐的一些基本知识，主要回顾了其中Ｌｉ２Ｏ—Ｂ２Ｏ３体系的研究历史，讨论了该体系结构与性质的关系并总结了Ｌｉ２Ｏ－Ｂ２Ｏ３晶态及非晶态物质作为新型功能材料的研究进展。  相似文献   

面向21世纪的煤化工   总被引：8，自引：0，他引：8  

魏贤勇  高晋生 《华北地质矿产杂志》1996,11(1):1-8

煤炭是中国的主要能源和资源，但同时也是主要的污染源。从保护环境、合理利用有限的化石资源的角度和中国的具体国情考虑，应该大力开发温和化高效煤的新工艺，使煤炭资源逐步由能源型利用转化为材料型利用，近年来，我们在煤的溶剂萃取，脱硫降灰机理，煤相关模型化合物反应，煤焦油中稠环芳香族化合物的分离精制，功能性高分子单体合成及一氧化碳高效吸附剂的制备等方面做了大量的研究工作，结合这些研究工作，本文介绍了煤化工的  相似文献   

矿物材料合成的直流弧光法   总被引：1，自引：0，他引：1  

陈素纯  傅慧芳 《大地构造与成矿学》1996,20(2):186-187

阐述了Ａｒ＋Ｈ２＋ＣＨ４气体体系中直流弧光放电过程，及其在金刚石膜等矿物材料合成中的应用。  相似文献   

山西铝土矿床成矿物质来源     

卢静文  彭晓蕾  徐丽杰 《吉林大学学报(地球科学版)》1997,(2)

山西铝土矿矿石中鲕、豆、碎屑等组构均具红土性质，结合化学成分特征、稀土元素特征、氧同住素特征、锆石等副矿物特征及含矿岩系底部岩层与下伏中奥陶纪灰岩关系和矿床分布与古陆、古岛的依赖关系等方面分析，铝土矿的成矿物质多是异源的，多为古陆上的铝硅酸盐岩红土风化产物，经流水以机械碎屑形式被搬运至海盆，沉积成矿  相似文献   

广西新型矿物材料发展方向初探     

李艺 《矿产与地质》2004,18(1):42-45

新材料是发展高新技术产业的基础。根据广西的矿产资源优势和在矿物材料方面的研究基础和技术力量，提出了加强工艺矿物学研究，大力发展广西新型矿物材料的研究开发方向，特别提出了超细改性矿物粉体材料、环保矿物材料、节能保温矿物材料、高技术陶瓷材料和合成矿物晶体材料等材料体系中的重点开发方向。  相似文献   

Analysis of Sediments and Soils by X-Ray Fluorescence Spectrometry Using Matrix Corrections Based on Fundamental Parameters   总被引：2，自引：0，他引：2  

Jacinta Enzweiler  Maria Aparecida Vendemiatto 《Geostandards and Geoanalytical Research》2004,28(1):103-112

Wavelength dispersive X-ray fluorescence spectrometry (WD-XRF) is widely used for the analysis of soils and sediments using well characterised procedures. However, difficulties can occur with samples such as unknowns containing small amounts of ore materials and samples collected from contaminated sites where trace elemental concentrations can exceed the concentration range for routine analysis. We studied the performance of a commercially available method, based on fundamental parameters (FP) to correct matrix effects. The spectrometer was originally calibrated with elemental or simple compound calibrants. Samples were analysed as pressed powder pellets. Eighteen sediment and soil reference materials, three of them with certified values for some of their constituents, were used to evaluate accuracy, by comparing results with recommended values and their standard deviations (RV ± 2s) or certified values and their confidence intervals (CV ± Cl). When results fell systematically outside these intervals, calibrations were refined with geochemical reference materials. The best agreement of results with recommended and certified values was obtained when the contents of H₂O and C in each sample were included as matrix constituents during calculations. The detection limits of trace elements tended to be relatively high, because the measuring conditions employed were not maximised for sensitivity. The main advantage of the method tested was that it enabled the analysis of samples with high concentrations of trace elements and the determination of elements such as F, Bi, Sb and W, which are not commonly included in quantitative XRF analysis of geological samples.  相似文献   

A Reflection on Mg, Cd, Ca, Li and Si Isotopic Measurements and Related Reference Materials   总被引：6，自引：1，他引：6  

Jean Carignan  Damien Cardinal  Anton Eisenhauer  Albert Galy  Mark Rehkamper  Frank Wombacher  Nathalie Vigier 《Geostandards and Geoanalytical Research》2004,28(1):139-148

This contribution aims to report the reflections we had with the scientific community during two international workshops on reference materials for stable isotopes in Davos (2002) and Nice (2003). After evaluating the isotopic homogeneity of some existing reference materials, based on either certificates, literature data or specific inter-laboratory rounds, we confirm these as primary reference materials or propose new ones relative to which stable isotope compositions should be reported. We propose DSM-3 for Mg, NIST SRM 915a for Ca, L-SVEC for Li and NBS28 for Si. Cadmium does not yet have a well identified delta zero material, although three commercial mono-elemental Cd solutions have yielded the same isotopic composition relative to one another. In order to scale the linearity of any mass spectrometer, some secondary reference materials are also proposed: Cambridge-1 solution for Mg, the "Münster-Cd" and JEPPIM Cd solutions for Cd and the "Big Batch" silicate for Si. The team from Nancy propose to prepare a mixed spike solution for Li isotopes. Well-characterised natural samples such as ocean or continental waters, diatoms, sponges, rocks and minerals are needed to validate the entire analytical procedure, particularly to take into account the effect of sample mineralisation and of chemical manipulations for elemental separation prior to analysis.  相似文献   

Precise/ Small Sample Size Determinations of Lithium Isotopic Compositions of Geological Reference Materials and Modern Seawater by MC-ICP-MS   总被引：6，自引：1，他引：6  

Alistair B. Jeffcoate  Tim Elliott  Alex Thomas  Claudia Bouman 《Geostandards and Geoanalytical Research》2004,28(1):161-172

The Li isotope ratios of four international rock reference materials, USGS BHVO-2, GSJ JB-2, JG-2, JA-1 and modern seawater (Mediterranean, Pacific and North Atlantic) were determined using multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS). These reference materials of natural samples were chosen to span a considerable range in Li isotope ratios and cover several different matrices in order to provide a useful benchmark for future studies. Our new analytical technique achieves significantly higher precision and reproducibility (< ± O.3%o 2s) than previous methods, with the additional advantage of requiring very low sample masses of ca . 2 ng of Li.  相似文献