地下水^32硅年龄的测定方法—液体闪烁计数法   总被引：1，自引：0，他引：1  

周炼  刘存富  王佩仪 《岩矿测试》2000,19(2):97-100

用Fe(OH) 3共沉淀从天然水中提取纯化SiO2 ,回收率在 30 %～ 98% ,然后提取32 P ,将H3PO4溶液和PicoflourLLT混合制备计数溶液 ,用液体闪烁计数法测量32 P的放射性 ,计算32 Si的放射性浓度 ,最后确定地下水的年龄。通过对河北平原浅层地下水的32 Si年龄进行测定 ,所得的32 Si年龄为 92 9 89a± 1 7 87a,与1 4 C的校正年龄一致  相似文献   

大水式金矿床稳定同位素、稀土元素地球化学研究   总被引：13，自引：1，他引：12  

闫升好  王安建  高兰  赵彦庆  陈国忠 《矿床地质》2000,19(1):37-45

大水式金太床是近年来在西秦岭地区发现的一个国内外十分罕见的金矿类型,具有极为独特的矿化特征。通过对矿区热液方解石、硅质岩矿石、硅化灰岩及原岩、岩浆岩等地质体碳－氧、硅－氧、碳－氢－氧同位素和稀土元素地球化学特征的系统研究揭示,成矿物质中碳为氧化作用改造的深成岩浆碳,硅具深部岩浆或岩浆热水来源的特点,成矿流体具岩浆水与建造水混合之特点,各种矿石稀土配分曲线和δＥｕ、δＣｅ值均与岩浆岩类似或接近而与地  相似文献   

Thermal equation of state of iron and Fe0.91Si0.09     

J. Zhang  F. Guyot 《Physics and Chemistry of Minerals》1999,26(3):206-211

We have carried out an in situ synchrotron X-ray diffraction study on iron and an iron-silicon alloy Fe_0.91Si_0.09 at simultaneously high pressure and temperature. Unit-cell volumes, measured up to 8.9 GPa and 773 K on the bcc phases of iron and Fe_0.91Si_0.09, are analyzed using the Birch-Murnaghan equation of state and thermal pressure approach of Anderson. Equation of state parameters on iron are found to be in agreement with results of previous studies. For both iron and Fe_0.91Si_0.09, thermal pressures show strong dependence on volume; the (∂K_T/∂T)_V values are considerably larger than those previously reported for other solids. The present results, in combination with our previous results on ɛ-FeSi, suggest a small dependency of the room-temperature bulk modulus upon the silicon content, less than 0.3 GPa for 1 wt.% silicon. We also find that substitution of silicon in iron would not appreciably change the thermoelastic properties of iron-rich Fe−Si alloys. If this behavior persists over large pressure and temperature ranges, the relative density contrast between iron and iron-rich Fe−Si alloys at conditions of the outer core of the Earth could be close to that measured at ambient conditions, i.e., 0.6% for 1 wt.% Si. Received: 13 January 1998 / Revised, accepted: 8 May 1998  相似文献   

高温焙烧对石英砂表面的影响   总被引：3，自引：0，他引：3  

赵中魁  孙清洲  张普庆  荆海鸥  孙益民 《矿物学报》2005,25(4):385-388

采用电子探针和透射电子显微镜研究了石英砂经900℃高温焙烧前后表面元素和杂质相颗粒簧竺竺。磊果表明：石英砂表面的O／Si比偏离si02的化学比例,高温焙烧后其表面的O／Si比接近为2。石英砂表面存在大量纳米尺寸的杂质相,高温焙烧使杂质相脱落,增大了石英的裸露表面积。  相似文献   

Interrelations between Si and P biogeochemical cycles—a new approach to the solution of the eutrophication problem     

V. Krivtsov  E. Bellinger  D. Sigee  J. Corliss 《水文研究》2000,14(2):283-295

Because the biogeochemical cycles of P and Si in temperate lakes are strongly connected by the dynamics of primary producers, it should be possible to influence the former cycle by causing changes in the latter. It is shown using the mathematical model ‘Rostherne’ that winter levels of ambient Si have a major influence both on spring levels of ambient P and on the summer cyanobacterial maxima. Additions of Si to the lakes could be used for the fine regulation of the biogeochemical balance and may prescribe a recipe for improvement of water quality, as well as a new solution to the problem of eutrophication. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

电感耦合等离子体发射光谱法测定水中硅和锶     

王英杰  梁楠  鲁慧文  潘克臣  王国伟 《吉林地质》2004,23(2):58-60

本文提出的等离子体发射光谱法测定水中的硅和锶,具有检出限低、线性范围宽,样品无需处理,可直接进样测量等优点。检出限：硅(以二氧化硅计)为0．5mg／L;锶为0．001mg／L。方法简便、准确,结果令人满意。  相似文献   

珠江口海域营养盐比及与浮游植物的关系   总被引：4，自引：0，他引：4  

董燕红  蔡建东  钱宏林 《海洋通报》2009,28(1)

根据2004-2006年珠江口海域的调查资料,对营养盐含量和比值与浮游植物群落结构的关系进行分析.结果显示,调查海域维持丰富的氮、磷、硅,其中氮、硅以东宝河口最高,磷以深圳湾最高;丰富的氮、磷、硅和较高的N:P均可能是形成调查海域多年来浮游植物群落以硅藻类占优势的主要原因;但是在深圳湾、桂山岛、万山列岛及横琴岛附近海域(主要是4月),营养盐含量及其之间的比例发生变化(深圳湾主要是 N:P,后三个岛屿附近海域主要是Si:N),对浮游植物群落结构变化产生影响;并且近年来珠海高速发展的养殖业造成其海域赤潮的频发.  相似文献