固体聚合膜电解浓集法测量天然水中低含量氚的化学淬灭效应研究     

蓝高勇  王华  俞建国  应启和  唐伟  杨会 《岩矿测试》2016,35(4):415-419

固体聚合膜电解浓集法是浓缩氚含量较低(1 Bq/m~3)的天然水样的常用方法,但因水样自身含有杂质离子或电解装置聚合膜带入杂质进入浓集液,使浓集液偏酸性,在测量过程中易产生化学淬灭效应,导致氚的测量值偏低。本文研究了水样自身存在的杂质离子和聚合膜上残留的杂质离子、样品溶液的pH值及其电导率所产生的化学淬灭效应的影响,实验表明,为减少化学淬灭效应,提高测量低含量氚的准确性,需保证水样溶液呈中性,电导率≤1μS/cm,同时避免杂质沉积在聚合膜上。如果水样溶液的pH值偏酸性、电导率大于1μS/cm,可采用酸碱混合型离子交换树脂去除水样中自身的杂质;对于聚合膜引入的杂质,可在电解后的水样中加入微量氨水将其pH值调节至中性。  相似文献   

序贯高斯模拟在矿石品位估计中的应用研究          下载免费PDF全文

刘占宁  宋宇辰  孟海东  于晓燕 《地质找矿论丛》2018,33(1):149-155

随机模拟是地质统计方法的重要内容。在矿石品位估计方法中克里格方法作为一种无偏估计方法,常被用于矿石品位的估计。但克里格法估值存在平滑效应。作者在分析序贯高斯模拟和普通克里格法基本原理的基础上,运用序贯高斯模拟方法和普通克里格方法对某铁矿体内全铁(TFe)品位进行估计,给出了品位估计结果模型。研究从勘探线方向、垂直勘探线方向和竖直方向分别计算变差函数,对球状模型、指数模型、高斯模型的变差函数拟合效果进行了优选,结果表明球型模型拟合效果最好。针对序贯模拟和克里格品位估值效果进行了分析,结果显示:序贯高斯模拟结果在品位分布形态上更接近样品品位分布形态,其平滑效应更小;克里格方法估计与序贯高斯模拟方法相比仅在品位均值方面更接近样本品位均值。因此,认为序贯高斯模拟方法可以更好地刻画矿体内品位分布状态。  相似文献   

鄂尔多斯盆地北部铀矿区砂岩型铀矿地浸水文地质条件初步分析评价   总被引：1，自引：0，他引：1  

陈法正  赵金锋  常宝成  高俊义 《铀矿地质》2006,22(3):163-167

本文对鄂尔多斯盆地北部砂岩型铀矿的水文地质条件、含矿含水层的岩性、水文地质结构、水动力条件、水文地球化学特征进行了系统分析和评价,认为地浸水文地质条件良好,可满足地浸采矿要求。针对该地区承压水头小、涌水量偏低的实际情况,结合抽注水连通试验涌水量显著增大的试验结果,提出了加压注水的技术方案,以人工方法提高地下水承压水头,增大涌水量,使之满足地浸采矿要求。  相似文献   

Cooling history and tectonic exhumation stages of the south-central Tibetan Plateau (China): Constrained by 40Ar/39Ar and apatite fission track thermochronology     

《Journal of Asian Earth Sciences》2007,29(2-3):266-282

Between the Qiangtang Block and Yalung-Zangpo Suture Zone in the south-central Tibetan Plateau, the following geological units and suture zones have been identified from south to north: the Gangdese Granitic Belt, the Lhasa Block, the Nyainqentanghla Shear Zone, the Dangxiong–Sangxiong Tectono-granitic Belt and the Bangong–Nujiang Suture Zone. To better constrain the tectonic evolution and cooling histories of these units, ⁴⁰Ar/³⁹Ar muscovite, biotite and K-feldspar, as well as apatite fission track dating and thermochronological analysis have been carried out. The analytical results indicate that the south-central Tibetan Plateau, with the exception of the Nyainqentanghla Shear Zone, provides a record of three cooling stages at 165–150, 130–110 and ∼45–35 Ma. Fission-track data modelling also indicates that the stages of cooling were different in the different tectonic belts or blocks. Very different cooling phases occurred in the south-central Tibetan Plateau, compared with southern Tibet, as well as along the Yalung–Zangpo Suture Zone. There is no thermochronological evidence to indicate that the south-central part of Tibetan Plateau was influenced by the underthrusting of Indian Plate.The three-stage cooling history and the stages of tectonic exhumation were controlled completely by the closure of the Bangong–Nujiang Suture Zone along its eastern segment during Middle–Late Jurassic (165–150 Ma) and its western segment in the Early–Late Cretaceous (130–110 Ma), as well as by the collision between the Indian and Asian plates in the Paleogene (45–35 Ma).  相似文献   

白云鄂博矿区周围火成碳酸岩岩墙地质特征   总被引：19，自引：0，他引：19       下载免费PDF全文

陶克捷  王文志 《地质科学》1998,33(1):73-83

首次填出白云鄂博矿区周围火成碳酸岩岩墙的分布图,深入系统地研究了岩墙的地质产状、主矿物类型、岩石结构、人工重砂矿物组成、稀土元素含量等特征。反映了白云鄂博矿区周围火成碳酸岩岩墙的岩浆演化分异过程存在差异。对于研究白云鄂博矿区铁与稀土的矿化提供了物质来源的证据。  相似文献   

Toxicity identification in metal plating effluent: Implications in establishing effluent discharge limits using bioassays in Korea     

《Marine pollution bulletin》2009,58(6-12):637-644

Because of complexity and diversity of toxicants in effluent, chemical analysis alone gives very limited information on identifying toxic chemicals to test organisms. Toxicity identification evaluation (TIE) techniques have been widely used to identify toxicants in various samples including industrial wastewater as well as natural waters. In response to new regulation for effluent discharge in Korea, which will be effective from 2011, a necessity of studies emerges that investigates toxicity levels in industrial effluents. This work was a preliminary study examining toxicity levels in effluent from one metal plating factory using Daphnia magna (48 h immobility) and identifying toxicity-causing substances. Toxicity tests showed variability on different sampling occasions and the results of TIE methods indicated that both organic compounds and metals contributed to the observed toxicity in metal plating effluent. Further studies are necessary to help reduce effluent toxicity especially from direct dischargers, who will have to comply with the new regulation.  相似文献   

中国北方6种新的砂岩型铀矿对铀资源潜力的提示   总被引：11，自引：6，他引：5       下载免费PDF全文

张金带徐高中  林锦荣彭云彪 王 果 《中国地质》2010,37(5):1434-1449

经过近10多年的努力,在中国北方中新生代沉积盆地发现和探明了6种新的大型、特大型砂岩型铀矿,暂时定名为伊犁式、吐哈式、东胜式、乌兰察布式、马尼特式、通辽式砂岩型铀矿。各种式样的铀矿产于不同构造背景的沉积盆地,矿床地质、矿体地质和控矿因素也有明显的差异性特征。成矿演化基本特点是:伊犁式、吐哈式都是典型的层间氧化-还原作用成矿,但前者在单斜整体抬升和差异升降构造活动背景下的不断叠加富集为重要特征,后者则在斜坡带隆升加断层及小型背斜构造活动的背景下在断裂南北两侧分带成矿;东胜式主要受古层间氧化带控制并接受后期还原改造再富集;乌兰察布式最新研究认为是重要的沉积成岩型铀矿,与湖泛事件演变密切相关;马尼特式是潜水氧化-还原作用与层间氧化-还原作用交替转化形成的古河谷型铀矿床;通辽式是"构造剥蚀天窗+断裂活动+深部还原物质"控矿,也可能还与基性岩脉(热源)有关。上述6种式样铀矿的另一规律是从西部向东部,西部(前三种)均产于中下侏罗统含煤碎屑岩系,东部(后三种)均产于上白垩统泥质砂岩和细砂岩。笔者指出,6种新的砂岩型铀矿的意义不仅仅在于发现和探明的本身增强了中国铀资源保障能力,更重要的意义还在于对中国铀资源潜力及今后找矿方针、勘查部署等多方面的重要提示。  相似文献   

The application of cluster analysis in geophysical data interpretation   总被引：1，自引：0，他引：1  

Yu-Chen Song  Hai-Dong Meng  Michael J. O’Grady  Gregory M. P. O’Hare 《Computational Geosciences》2010,14(2):263-271

A clustering algorithm that is based on density and is adaptive density-reachable is developed and presented for arbitrary data point distributions in some real-world applications, especially in geophysical data interpretation. Through comparisons of the new algorithm and other algorithms, it is shown that the new algorithm can reduce the dependency of domain knowledge and the sensitivity of abnormal data points, that it can improve the effectiveness of clustering results in which data are distributed in different shapes and different densities, and that it can get a better clustering efficiency. The application of the new clustering algorithm demonstrates that data mining techniques can be used in geophysical data interpretation and can get meaningful and useful results, and that the new clustering algorithm can be used in other real-world applications.  相似文献   

烃气测量法在辽宁白云金矿找矿潜力评价中的应用     

吴二  陈远荣  刘巍 《物探与化探》2014,(2):248-254

通过对辽宁白云金矿区典型的Ⅰ-1号金矿体11线的地表及井下不同标高进行系统采样,分析各指标异常在空间上与金矿体之间的对应关系,弄清白云地区地表土壤次生晕与坑道原生晕的关联性,发现烃气测量法在辽宁景观条件下完全适用,总结出了本区进行找矿预测的地质和地球化学找矿标志。通过对姚家岭北部地区进行烃类组分及部分微量元素异常展布特征分析,并结合异常分布区的地质条件进行了综合找矿潜力评价,圈定了相关找矿有利区。  相似文献   

Study on Deformation and Supporting Measures of Mining Roadway with Compound Roof     

Dong  Hongjuan  Zhang  Jinshan  Zhang  Feng 《Geotechnical and Geological Engineering》2022,40(3):1449-1462

Geotechnical and Geological Engineering - The No. 3 coal seam is one of the primary mineable coal seams in Du’erping coal mine of Shanxi Coking Coal Group Co., Ltd. The direct roof of No. 3...  相似文献