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1.
多元素有效态浸提方法的研究 总被引：1，自引：0，他引：1
多元素有效态分析目前仍处于探索研究阶段。采用正交试验法进行浸提试验，优化了多元素有效态浸提剂AB—DTPA的浸提条件。采用所选条件，对标准样品及土壤样品进行了浸提试验，结果表明K、Mn、Fe、Cu、Zn、P、Co、Ni、Pb、Cd、As、Se的浸提量与标准法均有很高的相关性。 相似文献
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本文以浙江省北部地区205件碱性土壤采用两种浸提方法取得的重金属可浸提量数据为依据,研究了不同浸提方法元素浸提量差异性及其关系,为农业地质环境研究中土壤元素浸提方法的选择及不同浸提方法取得的数据资料的处理与对比提供了技术方法.以105件典型土壤样的土壤类型、土壤理化指标及全量、有效量资料为依据,研究了土壤元素有效量、有效度的影响因素.其成果是环境评价、地球化学灾害预测与防治、合理肥施的科学依据. 相似文献
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《矿产与地质》2019,(5)
通过试验建立了一种超声加热浸提技术结合电感耦合等离子体质谱法测定土壤样品中有效硼的分析方法。实验对浸提温度、浸提时间、试液过滤方式以及测定干扰进行了研究,确定了土壤有效硼的超声浸提最适宜温度为70℃,浸提时间为20min,采用离心加滤膜过滤方式得到待测溶液。在最佳仪器工作条件下,采用103 Rh作为内标元素,选择11B作为测定同位素消除了测定干扰。实验结果表明:本方法检出限为0.009μg/L,测定结果的相对标准偏差(RSD)在0.92%～3.10%之间,样品加标回收率为98%～101%。应用本方法对土壤有效态成分分析标准物质GBW07416a、GBW07417和GBW07460进行了分析,测定值与认定值相符。与传统的沸水浸提标准方法相比,操作更为简便快速,无污染,准确度和精密度高,并且具有更低的检出下限,可用于大批量农田区土壤、森林土壤、离子型稀土矿区土壤以及重金属矿区土壤样品中有效硼的测定。 相似文献
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在铁观音茶叶主产区福建省安溪县27个茶园采集了表层(0~20 cm)和亚表层(20~40 cm)土壤,风干过2 mm筛后,采用超声振动筛进行筛分,并测定了粒级样品元素含量。结果表明:(1)2000~840μm和840~250μm的大团聚体颗粒占土壤样品重量的73%左右,而250~125μm、125~63μm和63μm 3种微团聚体约占27%;(2)大团聚体与微团聚体量的比值与土壤Si O2呈反比,与Al2O3、Fe2O3呈正相关,说明富含黏土矿物和铁铝氧化物有利于大团聚体颗粒的形成。土壤大团聚体与微团聚体中Cd、Cr、Hg、Ni、P、Al等多数元素指标的浓度差异明显,除了Si O2、Mn外,其他指标均不同程度地自粗粒级向细粒级逐渐增加,以P、Zn、Zr、Corg最为明显;(3)浸提实验表明,水提取态元素浓度最低,As、Cu、Pb、Zn浸提量由水提取—NH4NO3提取—稀盐酸提取—DTPA提取逐步增加;对于其他元素,稀盐酸提取态Cd、Se较高,NH4NO3提取态Mn、Ni较高,Hg则以NH4NO3提取态和DTPA浸提态较高。表层土壤中多数元素浸提浓度高于亚表层土壤,推断与表层土壤有机碳较高有关。 相似文献
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酸性条件下红壤中铝的活化及环境意义 总被引：8，自引：4，他引：8
利用动态反复浸提模拟实验研究了4种红壤中固相铝的活化过程。结果表明，红壤酸化程度与土壤表面变换性铝呈正相关关系。当高强度外源H^ 输入土壤后，有机铝和无机铝均可活化。浸提初期以弱键合的有机铝活化为主，当浸提到一定程度时，弱键合有机铝亏损，无机铝活化的相对重要性显示出来。20次浸提后，宁海红壤，嵊县红壤及永春红壤的铝总活化量中无机铝占主要部分。当土壤酸化到一定程度时（如屯溪红壤）有机铝和无机铝均亏损，铝的活化量很低。酸性条件下弱键合有机铝的快速活化产生高浓度的可溶性铝以及随后的快速亏损都将对生态环境产生重要影响。 相似文献
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湖南香花岭矿区是南岭地区东西向构造-岩浆-成矿带的重要组成部分,矿区内成矿地质条件非常优越,以矿床类型多、矿产种类复杂而著称,其中锡铅锌矿床是该矿区南岭成矿带非常重要的多金属矿床,赋存的矿石类型主要以锡石-硫化物型锡矿石、锡铅锌矿石、硫化物型铅锌矿石为主,为了进一步研究区域成矿条件、矿床地质特征、元素赋存状态及有色金属矿产综合利用,准确测定锡、铅、锌有色金属元素的含量非常必要。湖南香花岭矿区锡铅锌矿床中锡、铅、锌元素的平均品位都为百分含量,且锡本身是一种难分解元素,因此,常规的酸溶很难将高含量的锡、铅、锌元素分解完全。针对香花岭矿区锡铅锌矿床样品的特殊性,本文建立了碱熔-电感耦合等离子体发射光谱同时测定湖南香花岭矿区锡铅锌矿床中锡铅锌的分析方法：(1)优化了碱熔试剂选择、试剂用量、碱熔温度、碱熔时间等实验前处理及等离子体激发条件、元素谱线、扣背景位置等仪器测定条件,在比较氢氧化钠、无水碳酸钠和过氧化钠3种熔剂对分析结果影响的基础上,选择以4.0g过氧化钠作为熔剂,在750℃下恒温熔融试样20min,约30mL沸水浸提后加入20mL浓盐酸酸化,保证样品分解完全;(2)以空白碱熔酸化溶液为... 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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Inter-regional correlation of transgressions and regressions in the Cretaceous period 总被引：1，自引：0，他引：1
T. Matsumoto 《Cretaceous Research》1980,1(4):359-373
Well investigated platforms have been selected in each continent, and the history of Cretaceous transgressions and regressions there is concisely reviewed from the available evidence. The factual records have been summarized into a diagram and the timing of the events correlated between distant as well as adjoining areas.On a global scale, major transgressions were stepwise enlarged in space and time from the Neocomian, via Aptian-Albian, to the Late Cretaceous, and the post-Cretaceous regression was very remarkable. Minor cycles of transgression-regression were not always synchronous between different areas. Some of them were, however, nearly synchronous between the areas facing the same ocean.Tectono-eustasy may have been the main cause of the phenomena of transgression-regression, but certain kinds of other tectonic movements which affected even the so-called stable platforms were also responsible for the phenomena. The combined effects of various causes may have been unusual in the Cretaceous, since it was a period of global tectonic activity. The slowing down of this activity followed by readjustments may have been the cause of the global regression at the end of the Cretaceous. 相似文献
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The Afyon stratovolcano exhibits lamprophyric rocks, emplaced as hydrovolcanic products, aphanitic lava flows and dyke intrusions, during the final stages of volcanic activity. Most of the Afyon volcanics belong to the silica-saturated alkaline suite, as potassic trachyandesites and trachytes, while the products of the latest activity are lamproitic lamprophyres (jumillite, orendite, verite, fitztroyite) and alkaline lamprophyres (campto-sannaite, sannaite, hyalo-monchiquite, analcime–monchiquite). Afyon lamprophyres exhibit LILE and Zr enrichments, related to mantle metasomatism. 相似文献
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正20140751 Guo Xincheng(Geological Party,BGMRED of Xinjiang,Changji 831100,China);Zheng Yuzhuang Determination and Geological Significance of the Mesoarchean Craton in Western Kunlun Mountains,Xinjiang,China(Geological Review,ISSN0371-5736,CN11-1952/P,59(3),2013,p.401-412,8 相似文献
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正20141058 Chen Ling(Key Laboratory of Mathematical Geology of Sichuan Province,Chengdu University of Technology,Chengdu610059,China);Guo Ke Study of Geochemical Ore-Forming Anomaly Identification Based on the Theory of Blind Source Separation(Geosci- 相似文献
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正20141334 Chen Kun(Institute of Geophysics,China Earthquake Administration,Beijing100081,China);Yu Yanxiang Shakemap of Peak Ground Acceleration with Bias Correction for the Lushan,Sichuan Earthquake on April20,2013(Seismology and Geology,ISSN0253-4967,CN11-2192/P,35(3),2013,p.627-633,2 illus.,1 table,9 refs.)Key words:great earthquakes,Sichuan Province 相似文献
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正20141624 Cai Xiongfei(Key Laboratory of Geobiology and Environmental Geology,Ministry of Education,China University of Geosciences,Wuhan 430074,China);Yang Jie A Restudy of the Upper Sinian Zhengmuguan and Tuerkeng Formations in the Helan Mountains(Journal of Stratigraphy,ISSN0253-4959CN32-1187/P,37(3),2013,p.377-386,5 illus.,2 tables,10 refs.) 相似文献
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正20142263Lü Shaojun(Geological Survey of Jiangxi Province,Nanchang 330030,China)Early-Middle Permian Biostratigraphical Characteristics in Qiangduo Area,Tibet(Resources SurveyEnvironment,ISSN1671-4814,CN32-1640/N,34(4),2013,p.221-227,2illus.,2tables,22refs.)Key words:biostratigraphy,Lower Permian,Middle Permian,Tibet 相似文献
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正20142560Hu Hongxia(Regional Geological and Mineral Resources Survey of Jilin Province,Changchun 130022,China);Dai Lixia Application of GIS Map Projection Transformation in Geological Work(Jilin Geology,ISSN1001-2427,CN22-1099/P,32(4),2013,p.160-163,4illus.,2refs.) 相似文献
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正20140692 Duo Tianhui(No.402 Geological Team,Exploration of Geology and Mineral Resources of Sichuan Authority,Chengdu611730,China);Wang Yongli Computer Simulation of Neptunium Existing Forms in the Groundwater(Computing Techniques for Geophysical and Geochemical Exploration,ISSN1001-1749,CN51-1242/P,35(3), 相似文献