X射线荧光光谱法在耐火材料成分分析中的应用   总被引：4，自引：1，他引：4       下载免费PDF全文

李国会  徐国令  李晓莉 《岩矿测试》2003,22(3):217-220224

采用熔融法制样,用X射线荧光光谱法对耐火材料中的Na2O、MgO、Al2O3、SiO2、K2O、CaO、TiO2、Cr2O3、MnO、Fe2O3、ZrO2、HfO2组分进行测定,使用康普顿散射线作内标和经验系数法校正基体效应,经标准物质检验与标准值吻合,大部分组分的RSD<5%(n=10)。  相似文献   

悬浮液进样—石墨炉原子吸收光谱法测定琥珀中微量铅   总被引：3，自引：0，他引：3       下载免费PDF全文

陈世忠 《岩矿测试》2003,22(3):228-230

报道了以NH4H2PO4为基体改进剂，采用悬浮体制样石墨炉原子吸收光谱法直接测定琥珀中微量铅的方法。试验了影响测定的主要因素。在优化实验条件下。方法的检出限为0．038μg／g，Pb的质量浓度为0～80μg／L时，工作曲线线性关系良好。对于ω(Pb)=5．71μg／g样品的测定，相对标准偏差(RSD，n=5)为6．83％。  相似文献   

原子吸收光谱法及其应用   总被引：11，自引：0，他引：11       下载免费PDF全文

李雯  杜秀月 《盐湖研究》2003,11(4):67-72

综述了原子吸收光谱法的原理、测定技术、特点、联用、进展及其在各个领域中的应用。  相似文献   

测定微量铬(VI)的新方法--邻氯苯基荧光酮荧光熄灭法     

黄慧萍  陈冬梅  李华清 《地质科技情报》2002,21(1):107-109

基于Cr(Ⅵ）－邻氯苯基荧光酮（O－Cl-PF)-CTMAB体系的荧光熄灭效应，提出了一种测定痕量铬（Ⅵ）的新荧光方法。在pH=8.3的NH4Cl-NH3H2O介质中，该物的最大激发波长和发射波长分别是400nm和 550nm。铬（Ⅵ）量2－48μg/L[0.05-1.2μg/(25mL)]范围内与相对荧光强度ΔF呈线性关系，检出限为1μg/L。该方法可用于电镀废液、湖水、矿石中痕量铬（Ⅵ）的直接测定。  相似文献   

MagiX PRO X射线荧光光谱仪在多目标地球化学调查中的应用     

江冶  侯鹏飞  黄健 《江苏地质》2002,26(3):157-160

X射线荧光光谱分析从20世纪80年代起就成为我国化探扫面分析最有效的手段之一[1]。进入21世纪后，新一轮目标地球化学调查工作全面展开，对分析准确度和检出限提出了更高的要求[2]，使用PHILIPS公司生产的新型MagiX PRO X射线荧光光谱仪进行多目标地球化学调查样品的多元素分析。经对5000多试样分析结果表明，该仪器可分析39个元素，其中内检合格率在96％以上的有23个元素，并首次给出Cl、Br、TI等元素的结果。  相似文献   

A New Method for Clay Mineral Analysis and Its Application in Geology   总被引：3，自引：0，他引：3  

WANG Hejing  LU Anhuai  CHEN TaoThe Key Laboratory of Orogenic Belts  Crustal Evolution  Ministry of Education  Chin  School of Earth  Space Sciences  Peking University  Beijing  China 《《地质学报》英文版》2002,76(4):429-436

X-ray diffraction (XRD) peaks in a low-angle diffraction section of clay minerals, especially those of authigenic origin, have broadening and tailing features in shape. Using the five basic parameters, peak position, peak height, width, shape coefficient and asymmetry, to describe an XRD peak is more accurate, comprehensive and integrated than using only 3 of them, position, height and width. Following the concept of the five basic parameters of an XRD peak, the program Decoform proposed in this study provides more information in mineralogical analyses by fitting actual XRD profiles. In combination with the HW-IR plot, Decoform can be systematically and accurately used in the comprehensive analyses of crystallinity, domain size, lattice strain and quantitative phase. It is also of value for the geological investigations of diagenesis, metamorphism, basin maturity, structural stress field and so on.  相似文献   

High Precision Hf-W Isotopic Measurements in Meteoritic Material Using Negative Thermal Ionisation Mass Spectrometry (NTIMS)   总被引：1，自引：0，他引：1  

Ghylaine Quitté  Jean-Louis Birck  Françoise Capmas  Claude J. Allègre 《Geostandards and Geoanalytical Research》2002,26(2):149-160

This paper presents a two-stage anion-exchange procedure for tungsten extraction, an improved mass spectrometric procedure for tungsten analysis and a simplified chemical separation and TIMS procedure for the determination of Hf concentrations. The chemical separation of tungsten is based on its complexing properties with HF and H₂O₂. The blank level for a sample size of 300 mg is about 80 pg for tungsten. The procedure is designed for the high sensitivity of negative thermal ionisation mass spectrometry (NTIMS) provided by the use of Mg oxide as an emitter on Ir filaments. Tungsten can be readily measured with a high precision in various meteoritical material and especially in small W-poor silicate fractions. Samples containing as little as a few ng g^-1 tungsten can be analysed reliably with this method.  相似文献   

Towards a more ecologically relevant assessment of the impact of heavy metals on the photosynthesis of the seagrass, Zostera capricorni     

Catriona M. O. Macinnis-Ng  Peter J. Ralph 《Marine pollution bulletin》2002,45(1-12)

This in situ study used photosynthetic activity (measured as chlorophyll a fluorescence) and photosynthetic pigment concentrations to assess the effect of copper, cadmium, lead and zinc on the seagrass Zostera capricorni. Custom-made portable in situ exposure (PIE) chambers were developed so seagrasses could be dosed within the meadow. Z. capricorni was exposed to 0.1 and 1 mg l⁻¹ of metal solutions for 10 h. During this time and for the subsequent four-day recovery period, the effective quantum yield of photosystem II (PS II) (ΔF/Fm^′) was measured. While the results were variable, copper and zinc exposed samples had a depressed ΔF/Fm^′ during the exposure period. Samples exposed to zinc recovered to pre-exposure levels but those exposed to copper did not. Cadmium and lead did not impact on the chlorophyll a fluorescence and the chlorophyll pigment data supported these findings. This study presents an innovative new application of chlorophyll a fluorescence stress assessment.  相似文献   

In‐situ gamma‐ray spectrometric study of weathered volcanic rocks in Hong Kong     

Margie Q. F. Chen  Lung S. Chan 《地球表面变化过程与地形》2002,27(6):613-625

In‐situ gamma‐ray spectrometry (GRS) measurements were conducted at 35 sites in Hong Kong where volcanic rocks with varying extent of weathering were exposed. Elemental analyses using X‐ray fluorescence spectrometry and inductively coupled plasma–mass spectrometry were carried out on samples collected from these 35 plus 22 other locations to assess the feasibility of using the GRS method to quantify the extent of weathering. The Parker weathering index, varying within a range of 0·0–0·8 for the samples studied, was used as a geochemically based reference scheme for correlating the gamma‐ray spectrometric results with the extent of weathering. For the former 35 sites, the concentrations of the three major radioelements, K, U and Th, determined by in‐situ GRS were compared to laboratory‐determined values from the samples. The study reveals that no significant change occurs to the contents of the three radioelements during the initial state of weathering. But once the rocks become highly weathered, further progression of weathering is accompanied by a systematic removal of K and an increased dispersion of U and Th. The results show that K content, which is indicative of the extent of weathering, can be retrieved reliably with the gamma‐ray spectrometry technique. The study has given support to the potential use of the downhole spectral gamma method for evaluation of weathering grade and the detection of subsurface clay‐rich levels. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

西藏罗布莎铬铁矿床中的金刚石包体X更线衍射研究     

施倪承  白文吉  马喆生  方青松  熊明  颜秉刚  代明泉  杨经绥 《地质学报》2002,76(4):496-500

在西藏罗布莎蛇绿岩的豆荚状铬铁矿石及橄榄岩中找到了金刚石,少数金刚石存在有硅酸盐包体。本研究采用X射线衍射中的CCD(电子藕合)探测技术,测得了粒度仅为20 μm左右的包体矿物的粉晶X衍射数据,数据表明该硅酸盐包体有两种,为滑石和蛇纹石。从而说明了西藏罗布莎产于蛇绿岩中的金刚石是天然金刚石,并非“人工合成物”。  相似文献