大别山北缘地质找矿中遥感方法的研究     

赵英时  杨忆  谭海樵  徐贵忠 《遥感学报》1994,(1)

本项工作着重探讨在植被覆盖、地质背景十分复杂的地区，利用遥感信息寻找金矿及其它多金属矿的方法。即从地层岩系、构造及构造交叉部位、蚀变带这三个方面，进行地质找矿专题信息特征提取方法的研究。最后，通过信息提取及影像综合特征，进行遥感地质制图，圈定找矿有希望的地段。  相似文献   

Determination of nitrophenols,diaminotoluenes, and chloroaromatics in ammunition wastewater     

P. Mußmann  R. Eisert  K. Levsen  G. Wünsch 《洁净——土壤、空气、水》1995,23(1):13-19

Methods for the determination of three compound classes, i. e. diaminotoluenes, nitrophenols, and chloroaromatics in groundwater of a former ammunition plant are reported. Diaminotoluenes were extracted by discontinuous liquid/liquid-, nitrophenols by continuous liquid/liquid-extraction using dichloromethane, and chloroaromatics by solid-phase extraction. These compound classes may be analyzed by gas chromatography (GC) or gas chromatography coupled to mass spectrometry (GC/MS) without derivatization or after derivatization with N-methyl-bis(trifluoroacetamide) (MBTFA) or heptafluorobutyric anhydride (HFBA) in the case of diaminotoluenes and HFBA or acetic anhydride in the case of nitrophenols. An atomic emission detector (AED) coupled to a gas chromatograph may be employed for the analysis of chloroaromatics. High selectivity can be achieved using the characteristic wavelengths of chlorine. A variety of these compounds were identified and quantified in a groundwater sample from the former ammunition plant Elsnig (Saxony, Germany). Concentrations were in the lower ppb range. Thus, dichlorobenzenes which may have been used as substituents at the end of World War II could be identified in groundwater samples at this site.  相似文献   

TRPO萃取-固体荧光法测定土壤和空气尘埃中的铀     

王功鹏  赵法  周小民 《铀矿地质》1987,(2)

本文在研究了影响萃取的各种因素后,给出了用TRPO-OK萃取-固体荧光法测定土壤和空气尘埃中铀的方法。土壤和空气尘埃样品全程回收率分别为(89.6±11.8)％和(85.5±5.6)％,方法灵敏对土壤和空气尘埃样品分别为0.03μg·g~(-1)和0.02Pg·1~(-1)。样品中的常量离子对分析不产生明显干扰。操作简便、快速,适用于常规监测和本底调查。  相似文献   

地电提取测量法在北衙寻找隐伏矿的可行性   总被引：4，自引：0，他引：4  

李晓勇 《云南地质》2002,21(1):83-89

地电化学提取测量法是应生产需要而发展起来的一种轻便，快捷的寻找隐伏矿床的方法，在云南鹤庆县北衙地区进行实验研究，取得较好的效果，并在末知矿区圈定了远景规划区，为进一步探矿提供科学依据。  相似文献   

Two Experimental Methods to Determine the Speciation of Cadmium in Sediment from the River Neckar     

N. Martin  I. Schuster  St. Peiffer 《洁净——土壤、空气、水》1996,24(2):68-76

The binding forms of Cd to an anaerobic sediment of low sulfide content from Lauffen reservoir (River Neckar, Germany) were studied using two different approaches, i. e. sequential extraction (modified from published protocols) and titrimetric study of the pH-dependent Cd release. Thermodynamic equilibrium calculations were applied to calculate both the release pattern of Cd during the titrations and the speciation of Cd within the single fractions of the extraction protocol. The calculations were based on measured sediment parameters such as hydrous ferric oxide (HFO), acid volatile sulfide, carbonate content and total Cd content, and the extractants (oxalate, acid etc.) used. The results of the two independent approaches coincided well in that they both assigned more than two thirds of the total Cd content to be adsorbed to organic matter. Cd bound as CdS is of little importance. Sequential extraction after a 3-month oxidation period at pH 7 revealed a shift of Cd from being mainly bound in stronger surface complexes with organic matter to being mainly bound in weaker surface complexes with organic matter and HFO, and thus becoming more bioavailable. This study suggests that the use of sequential extraction although being frequently criticized due to its operational character can be used to determine binding forms of metal ions if they are accompanied by 1) careful supporting experiments, 2) analysis of important sediment parameters, and 3) the use of thermodynamic equlibrium models which can help to understand Cd speciation within the extraction fractions.  相似文献   

花岗岩中痕量钍同位素的液—液萃取分离法     

涂国荣  张利兴 《铀矿地质》1992,8(2):123-127

  相似文献   

APDC-MIBK萃取石墨炉原子吸收法测定地质样品中痕量钯   总被引：1，自引：0，他引：1       下载免费PDF全文

伊丽莹  张海政 《地质科学》1995,30(2):190-194

近年来金矿源岩研究引起国内外地质学家的极大关注。贵金属元素把具有双重特性,在超镁铁质岩浆结晶过程中性状与金相近,表现出强烈亲硫的特点,新鲜的没有发生过任何金流失的岩石,二者比值近似为一常数。把在成岩乃至于变质作用过程中呈惰性,保持其原始含量不变而又与金性状完全不同,这种双重性特征有可能借助于常数K=Au(原)/Pd(原),推算出没有发生过任何金流失时的岩石原始金含量(王建安,1986)。即通过样品中把的分析值求得原始金含量,借此对金矿源岩进行研究与判定。  相似文献   

Matlab对基于HDF格式的MODIS 1B数据的提取方法与实现   总被引：4，自引：1，他引：4  

陈林  牛生杰  仲凌志 《气象科学》2006,26(6):676-681

基于HDF文件格式的MODIS数据的应用越来越广泛,MODIS数据开发应用的前提是对MODIS 1B数据的提取。本文详细介绍了利用Matlab对HDF文件进行读写操作的过程,在此基础上给出了提取MODIS 1B数据的流程图,实现了对MODIS 1B数据的提取,为MODIS二级产品的开发打下了基础。  相似文献   

基于SVM遥感矿化蚀变信息提取研究   总被引：1，自引：0，他引：1  

傅文杰  洪金益  朱谷昌 《国土资源遥感》2006,(2):16-19,i0002

提出一种基于支持向量机(SVM)遥感数据矿化蚀变信息提取的新方法。该方法首先根据蚀变岩及矿体围岩的实测光谱数据,利用光谱角度制图法(SAM)提取训练样本,应用交叉比对(cross-validation)算法确定最优SVM模型参数,选择径向基(RBF)核函数,训练SVM分类器模型;然后,用训练好的SVM模型进行遥感矿化蚀变信息提取;最后,选择青海芒崖地区的ETM数据进行遥感矿化蚀变信息提取试验。试验结果经野外检查和验证,效果良好。  相似文献   

Influence of alcohols on the extraction of cerium(IV) by Aliquat-336 in kerosene     

Y.A. El-Nadi 《International Journal of Mineral Processing》2007

Tricaprylmethylammonium chloride (Aliquat-336) diluted with kerosene was used to extract cerium(IV) from nitric acid medium. Various alcohols were used as modifiers to overcome the third phase problem. The different parameters affecting the extraction process including nitric, nitrate, hydrogen ion, extractant and metal concentrations as well as the temperature were separately investigated. The effect of the investigated alcohols on the extraction process was also studied in detail at two different concentrations and correlated to their physical constants. Based on the obtained results, the extraction equilibrium was deduced and the optimum conditions for the extraction of cerium(IV) were proposed. The method was tested and applied to the separation of cerium from the hydrous oxide cake resulting from monazite sand.  相似文献