水分析技术进展   总被引：6，自引：1，他引：5  

王苏明  王亚平 《岩矿测试》1998,17(3):229-237

综述了１９９２年以来水分析技术的进展,内容包括样品预处理技术和测试方法,引用国内文献９７篇。  相似文献   

中国开发区的发展回顾与战略思考   总被引：2，自引：1，他引：2  

王峰玉  朱晓娟 《云南地理环境研究》2006,18(4):95-99

经过20多年的发展，开发区已经成长到了一个新的历史阶段。对开发区的建立发展和相关研究进行简单回顾后，总结出中国开发区的发展历程：摸索阶段、繁荣阶段和调整阶段；探讨了现阶段其面临的四大战略问题：认为开发区应定位为具有相对综合功能的新型城区；外向型和内向型的产业相结合；摆脱“孤岛”状态，逐步与周边地区融合、一体化的发展；同时应该慎重地对待开发区的体制变化，从而适应现阶段国内外的经济环境和实现自身的持续发展。  相似文献   

20年来四川食用蕈菌研究的回顾与展望     

谭伟 《山地学报》2004,(Z1)

四川省内菌物学工作者1970年代末开始对大型食用蕈菌进行研究,有文献资料记载是1983年。20年来, 既有引种、野生菌人工驯化栽培、高产栽培技术,又有病虫害防治的研究,还有应用原生质体融合技术选育新品种工作。其间选育出食用菌新品种12个,获得成果13项,其中获奖成果7项,最高奖项是国家技术发明二等奖。建议今后应加大野生食用菌资源合理开发利用和保护力度,加强新品种和新技术研究,加强精深加工产品开发,研究适宜四川产业化发展经营新模式等。  相似文献   

国外地浸砂岩型铀矿地质发展现状与展望   总被引：20，自引：9，他引：20  

王正邦 《铀矿地质》2002,18(1):9-21

本文首先以地浸砂岩型铀矿为重点，分4个阶段概要回顾了世界铀矿勘查和科研工作发展的历史，总结了基本的历史经验。其次，全面阐述了当前国外地浸砂岩型铀矿地质发展的现状，对砂岩型铀矿在世界铀矿在世界铀资源中的重要战略地位、矿床分类、时空展布特点和规律及地浸砂岩型铀矿的成矿理论和找矿技术方法的发展现状进行全面剖析，重点从构造条件、古气候条件、水文地质条件、岩相古地理和岩性条件及铀源条件等5个方面对地浸砂岩型铀矿的成矿条件进行了深入分析，对3类表生后生渗入型砂岩型铀矿的评价准则进行了概括性总结。以美国和中亚两个砂岩型铀矿主产区为代表，概述了国外地浸砂岩型铀矿勘查技术方法的发展现状。最后，在展望世界铀资源供需发展趋势的前提下，明确指出我国铀矿地质战线所面临的严峻挑战，有针对性地论述了我们应采取4个方面的战略对策。  相似文献   

冶金化探的回顾与展望          下载免费PDF全文

李惠  张国义 《地质找矿论丛》2002,17(4):266-270

回顾了冶金系统化探发展历程和取得的主要成果，对今后冶金化探的发展提出了展望与建议。  相似文献   

Isotope Dilution with Matrix Element Removal: A Key for High-Precision, High-Accuracy Trace Analysis of Geological Samples Using Inductively Coupled Plasma-Mass Spectrometry     

Christian Pin  Brieuc Le Fèvre 《Geostandards and Geoanalytical Research》2002,26(2):135-148

The isotope dilution (ID) method requires only the measurement of mass and isotopic mass ratios. For this reason, ID is considered a primary method of analysis, capable of higher precision and accuracy than comparative methods used in conventional instrumental analysis, that are based on calibration relative to reference materials. Compared to thermal ionisation mass spectrometers, inductively coupled plasma source-mass spectrometers (ICP-MS) benefit from several practical advantages, including direct liquid sampling at atmospheric pressure, a multi-element capability, high ionisation efficiency, fast scanning capability and widespread availability. These features greatly improve sample throughput, thereby allowing the isotope dilution method to be used on a routine basis. In turn, ID alleviates the need for quantitative sample handling, and thus makes separation of the analytes from matrix elements much easier. This allows ICP-MS instruments to be used under optimal conditions, because it is possible to use advanced, high efficiency sample introduction systems without resorting to large dilution factors. Moreover, the cleanliness of the sampling interface and ion optics is preserved, thereby allowing optimum instrumental performance to be maintained for extended periods, so reducing maintenance costs. Examples are given in this review to highlight the potential of isotope dilution combined with analyte separation for achieving high precision in trace element analysis of geochemical samples.  相似文献   

Traceability in Geochemical Analysis   总被引：2，自引：0，他引：2  

Jean S. Kane  Philip J. Potts 《Geostandards and Geoanalytical Research》2002,26(2):171-180

A review is presented of "traceability" and the way this concept can be demonstrated in the analysis of geochemical samples. It is suggested that the two practical methods are (i) by the analysis of appropriate certified reference materials with an evaluation of the agreement between analysed and certified values, and (ii) by the appropriate use of definitive, reference and standard methods of analysis. The differences between these two methods of demonstrating traceability are considered and the difficulties in applying them are discussed.  相似文献   

碘分析方法研究进展   总被引：5，自引：0，他引：5  

刘崴  杨红霞  李冰 《岩矿测试》2008,27(2):127-136

对国内外碘测定的样品前处理方法作了简要回顾,重点介绍了近10年来有关碘的测定方法及碘形态分析的最新研究进展。碘测定方法主要包括容量法、光度法、电化学法、中子活化法、色谱法、原子光谱法以及质谱法等。对测定碘形态的联用技术进行了简要介绍。引用文献113篇。  相似文献   

Neutron Activation Analysis,Atomic Absorption and X‐Ray Fluorescence Spectrometry Review for 2006–2007     

L. Paul Bédard 《Geostandards and Geoanalytical Research》2008,32(4):399-403

These mature analytical techniques do not show any change in publication level from the previous two years and AAS remains dominant in terms of the number of publications. The last two years have seen fewer technical improvements than in the previous review period. Some interesting papers dealing with uncertainty and quality assurance in INAA were published during 2006–2007. It is suggested that photon activation should be reconsidered because the source of electron accelerators has recently improved. A technique to preconcentrate Se for INAA determination has also been proposed. In the case of AAS, papers on analyte preconcentration continue to be more abundant than those relating to instrumental modification. Sample preparation for AAS is also active and ultrasound‐assisted leaching shows some promising applications. There were an unusual number of reviews concerned with AAS and those important to geological samples are cited here. A technique to preconcentrate Cr in water is presented and a new device to determine As and Se is showing some potential uses. Confocal X‐ray mapping continues to show interesting developments. One group developed a technique to perform XRF inside an oyster and an interesting application of μ‐XRF mapping of sediments is presented. Determination of platinum‐group elements (at μg g¹ concentrations) can be carried out very quickly with an improved XRF technique.  相似文献   

LA‐(MC)‐ICP‐MS Trends in 2006 and 2007 with Particular Emphasis on Measurement Uncertainties     

Paul J. Sylvester 《Geostandards and Geoanalytical Research》2008,32(4):469-488

Research in 2006 and 2007 dealing with laser ablation‐(multicollector)‐inductively coupled plasma‐mass spectrometry, LA‐(MC)‐ICP‐MS, involved studies concerned with optimising the technique itself, as well as applying the method to a variety of problems in the Earth sciences. The causes of elemental and isotopic fractionation produced during laser ablation continues to be of considerable interest, with evidence mounting that processes occurring both at the ablation site and in the argon plasma of the ICP are culpable. There is growing excitement in the use of femtosecond lasers for LA‐(MC)‐ICP‐MS, with the hope that they reduce or eliminate melting and non‐congruent volatilisation at the ablation site and thus approach stoichiometric sampling. Ablation chamber design emerged as a serious concern, particularly with respect to achieving the rapid washout needed for fine‐scale compositional mapping of geological objects. LA‐MC‐ICP‐MS provided data for a wide range of isotopic systems, especially hafnium, but also B, S, Mg, Cu, Fe, Sr, Nd, Pb and U. Measurement uncertainties in LA‐ICP‐MS were discussed by several researchers, and are critically reviewed here ‐ total uncertainties for trace element concentration measurements of silicates including errors on the calibration values of common reference materials are ～10% (95% confidence limits), though the precision of individual spot measurements (50 to 100 μm) is much better, ～1% RSD, using a 193 nm laser and a sector field‐ICP‐MS. LA‐ICP‐MS U‐Pb ages for zircon and other U‐rich accessory phases are claimed by most geoanalysts to have 2s uncertainties of ～0.7 and 1.3% respectively but the actual accuracy of the method is probably only as good as ～2% (2s), when uncertainties associated with laser‐induced Pb/U fractionation are included.  相似文献