APDC－MIBK萃取石墨炉原子吸收法测定地质样品中痕量钯          下载免费PDF全文

伊丽莹  张海政 《地质科学》1995,(2)

ＡＰＤＣ－ＭＩＢＫ萃取石墨炉原子吸收法测定地质样品中痕量钯伊丽莹，张海政（中国科学院地质研究所北京１０００２９）关键词钯，ＡＰＤＣ－ＭＩＢＫ，萃取，石墨炉原子吸收法《中图法》分类号Ｐ６１８．５Ｏ６５７．３１近年来金矿源岩研究引起国内外地质学家的极大关...  相似文献   

用正交设计法提取马尾藻高活性膳食纤维     

李来好  杨贤庆  吴燕燕  陈培基  刁石强 《广东海洋大学学报》1998,(2)

采用正交设计法,研究了马尾藻高活性膳食纤维的提取工艺条件,筛选出马尾藻碱溶性和不溶性膳食纤维的提取与漂白的最佳工艺条件,并将提取到的两种膳食纤维组分重新组合。结果表明,马尾藻高活性膳食纤维的总产率达27．9％,颜色较白,总膳食纤维干基含量达81．08％,钙含量6．82％,磷含量0．23％,膨胀力为22mL／g,持水力为1250％,质量和功能性指标远远超过西方国家标准。  相似文献   

溶剂萃取法制取硫酸钾中试及其新进展          下载免费PDF全文

李纪泽  王华安 《盐湖研究》1998,6(4):63-68

描述了用工业硫酸和氯化钾为原料,萃取法制取硫酸钾新工艺及其工程化的新进展。研究了该工艺三相萃取过程的基本原理,列出了试验数据及经济技术评价。  相似文献   

Determination of Antibiotic Residues in Manure,Soil, and Surface Waters     

Thorsten Christian  Rudolf J. Schneider  Harald A. Frber  Dirk Skutlarek  Michael T. Meyer  Heiner E. Goldbach 《洁净——土壤、空气、水》2003,31(1):36-44

In the last years more and more often detections of antimicrobially active compounds (“antibiotics”) in surface waters have been reported. As a possible input pathway in most cases municipal sewage has been discussed. But as an input from the realm of agriculture is conceivable as well, in this study it should be investigated if an input can occur via the pathway application of liquid manure on fields with the subsequent mechanisms surface run‐off/interflow, leaching, and drift. For this purpose a series of surface waters, soils, and liquid manures from North Rhine‐Westphalia (Northwestern Germany) were sampled and analyzed for up to 29 compounds by HPLC‐MS/MS. In each of the surface waters antibiotics could be detected. The highest concentrations were found in samples from spring (300 ng/L of erythromycin). Some of the substances detected (e.g., tylosin), as well as characteristics in the landscape suggest an input from agriculture in some particular cases. In the investigation of different liquid manure samples by a fast immunoassay method sulfadimidine could be detected in the range of 1…2 mg/kg. Soil that had been fertilized with this liquid manure showed a content of sulfadimidine extractable by accelerated solvent extraction (ASE) of 15 μg/kg dry weight even 7 months after the application. This indicates the high stability of some antibiotics in manure and soil.  相似文献   

超临界流体萃取技术及其应用   总被引：6，自引：0，他引：6  

尹卫萍  陈素兰 《江苏地质》2002,26(3):150-153

超临界流体萃取是近20年发展起来的新分离技术，应用范围广泛，已越来越多地受到人们的重视。简单介绍了该技术的原理及在食品、医药、环保等领域的应用和发展趋势。  相似文献   

分时窗提取地震子波及在合成地震记录中的应用   总被引：3，自引：6，他引：3  

冯晅  刘财  杨宝俊  崔凤林  李勤学 《地球物理学进展》2002,17(1):71-77

提出了利用地震和测井资料精确提取井旁地震子波的分时窗提取地震子波方法，将此方法用于合成地震记录的制作，提高了合成地震记录与地震剖面的吻合度和分辨率，文中详细介绍了该方法的具体实现步骤，并给出了模型处理分析和实例分析。  相似文献   

Trace metal occurrence in a mineralised and a non-mineralised spodosol in northern Sweden     

Magnus Land  Jonas Thunberg  Bjrn hlander 《Journal of Geochemical Exploration》2002,75(1-3)

In order to determine the metal-bearing phases with special emphasis on Cu, a sequential extraction has been carried out on seven soil samples from a sulphide-bearing spodosol profile in Liikavaara Östra, close to the Aitik Copper Mine in northern Sweden. A reference spodosol profile with very low abundances of sulphides located far from anthropogenic emissions was also studied. Five fractions were selected for the extraction: (I) CH₃COONa-extractable (exchangeable/adsorbed/carbonate); (II) Na₄P₂O₇-extractable (labile organics); (III) 0.25 M NH₂OH·HCl-extractable (amorphous Fe oxyhydroxides/Mn oxides); (IV) 1 M NH₂OH·HCl-extractable (crystalline Fe oxides); and (V) KClO₃/HCl-extractable (organics and sulphides). The distribution of trace elements (Co, Cr, Cu, Ni, Pb and Zn) in the profile in Liikavaara Östra is different from that in the reference profile. Possible explanations for these differences are (i) the presence of sulphides in the soil, (ii) atmospheric deposition of dust derived from mining activities at the Aitik Copper Mine, and (iii) mineralogical heterogeneities inherited from the deposition of the till. There is no straightforward correlation between the amount of the extracted phases and the metal extractability in the soils. This fact indicates that other factors are important for the retention of trace metals as well. The data presented in this study suggest that Co, Cr and Ni, to a fairly large extent, are associated with the organic matter in the B-horizon in both profiles, while in the C-horizon in Liikavaara Östra, sulphides are probably the more important carriers of these elements. For Co and Ni, Fe oxyhydroxides seem to be important. Most of the Cr occurred in the residual remaining after the leaching procedure. Copper and Zn seem to be associated with the organic matter to some extent in the B-horizon. The concentration of Cu in the C-horizon in Liikavaara Östra is high (2310 ppm), but only a very small fraction is likely to be hosted by sulphides. It is concluded that the major part of Cu in the C-horizon and a prominent fraction in the B-horizon in Liikavaara Östra are associated with some secondary phase that is extractable during extractions III and IV. Possible candidates for this phase are goethite and inclusions of native Cu in weathered biotite.  相似文献   

用天然斜发沸石从西藏地热水中分离提取K+,Rb+,Cs+的研究          下载免费PDF全文

王雪静  高世扬  周建国  卢雁 《盐湖研究》2002,10(3):31-37

根据天然斜发沸石对K+、Rb+、Cs+等无机离子的交换性能 ,研究采用天然斜发沸石从西藏地热水中提取分离K+、Rb+、Cs+的可行性。  相似文献   

自动赋初值的LSB-Snake模型的道路半自动提取方法研究   总被引：1，自引：0，他引：1  

张海涛  董明  祝晓坤 《北京测绘》2008,(2):1-4

LSB-Snake模型是一个半自动提取线状地物的有效方法,但是在提取道路时需要人工输入道路特征（与背景相比道路的亮暗、宽度）作为初始值,在初始种子点稀少的时候不够稳健,且降低了LSB-Snake模型的效率。因此,本文提出了自动赋初值的LSB-Snake模型,采用自适应模板匹配方法为LSB-Snake模型提供初始特征,同时在初始种子点的基础上自动生成可靠、密集的点,共同作为LSB-Snake模型的种子点参与道路提取。对IKONOS和QuickBird进行道路提取的试验证明：在给定同样数目的初始种子点的情况下,提出的自动赋初值LSB-Snake模型比LSB-Snake模型更加稳健;由于无需人工输入道路特征,自动化程度更高;在道路附近地物阴影、遮挡较多的情况下,抗干扰能力更强。  相似文献   

Research on extracting method of micro-scale remote sensing information combination and application in coastal zone     

YANGXiaomei  ZHOUChenghu  GONGJianming  GAOZhenyu 《海洋学报(英文版)》2009,28(5):30-38

Due to the need of rapid and sustainable development in China’s coastal zones, the high-resolution information theory using data mining technology becomes an urgent research focus. However, the traditional pixel-based image analysis methods cannot meet the needs of this development trend. The paper attempts to present an information extraction approach in terms of image segmentation based on an object-oriented algorithm for high-resolution remote sensing images. An aim of the author’ research is to establis...  相似文献