Water chemical behavior at Yangtze （Changjiang） River estuary     

Sivaji Patra Congqiang LIU Siliang LI Fushun WANG Baoli WANG 《中国地球化学学报》2006,25(B08):269-270

Geochemical cycling has received wide attention due to the need to understand the pathways of pollutants through our present environment. In this regard the Yangtze River plays a significant role in putting those pollutants into the East China SeafWorld Oceans. The Yangtze River is of high sedimentation rate and water discharge. The watershed covers variable climate regions from temperate to subtropical and from semiarid to humid. Twenty three （23） sampling locations at the estuary have been selected for understanding the dynamic relationships. The elements （Cl^-, SO4^2-, Na^＋, K^＋, and Ca^2＋） show conservative behavior during mixing of fresh water with saline water whereas Mg^2＋, Mn^2＋ show a non-conservative pattern . The relationships between Na^＋/SO4^2- and Cl^-/SO4^2- molar ratios show a mixing of more than two water sources.  相似文献   

Water chemistry and water quality variation in the Danjiangkou Reservoir, as a function of water management for the Middle Route of South to North Water Divert Project, China     

Siyue LI Quanfa ZHANG 《中国地球化学学报》2006,25(B08):274-274

As the diversion dike of the Middle Route of the South to North Water Transfer Project （MRSNWTP）, the water quality and water quantity of Danjiangkou Reservoir is critical to the project. At present, the rates of industrial wastewater treatment and sewage discharge, which belongs to Chinese State Standard in the districts near the reservoir except Shiyan city, are less than 60% and 40% respectively. The point source pollutants will be controlled because of the project after some time, but the non-point source pollutants caused by vegetation degradation and water-soil erosion will not be controlled effectively in a long time. Water samples were collected from the Danjiangkou Reservoir during 2004 and 2005 and analyzed for trace metals, i.e., silver （Ag）, aluminum （Al）, arsenic （As）, barium （Ba）, bismuth （Bi）, calcium （Ca）, cadmium （Cd）, cobalt （Co）, chromium （Cr）, copper （Cu）, iron （Fe）, mercury （Hg）, potassium （K）, lithium （Li）, magnesium （Mg）, manganese （Mn）, molybdenum （Mo）, sodium （Na）, nickel （Ni）, lead （Pb）, antimony （Sb）, selenium （Se）, silicon （Si）, strontium （Sr）, vanadium （V）, zinc （Zn）, chemicophysical parameters and nutrients, i.e., temperature （T）, pH, dissolved oxygen （DO）, turbidity, total suspended solid （TSS）, nitrate/ammonia/ammonium-nitrogen （NO3^-/NH3/NH4^＋-N）, total nitrogen （TN）, dissolved inorganic nitrogen （DIN）, total phosphorus （TP）, potassium permanganate index （IMn）, biochemical oxygen demand （BOD）, dissolved inorganic carbon （HCO3^-）. Our results are water quality belongs to Chinese standard level II, trace metals are low, but they are accumulating, and many of which, i.e., As, Pb, will endanger reservoir water security.  相似文献   

Structural Evolvement of Heating Treatment of Mg/AI-LDH and Preparation of Mineral Mesoporous Materials     

CHEN Tianhu XU Huifang WANG Yifeng QING Chengsong FAN Mingde CHEN Gang 《《地质学报》英文版》2006,80(2):170-174

Although hydrotalcite, or layered double hydroxides （LDHs）, is not a common mineral, it is an important material that can be easily synthesized in laboratory. In this study, structural evolvement and BET surface area changes of heat treated Mg/AI-LDH is evaluated by XRD, TEM and N2-BET analyses. The results indicate that the magnesium-aluminum LDH with carbonate as interlayer anion, periclase-like oxides was formed at temperatures of 400-800℃. Meanwhile, 2-3 nanometer mesoporous were formed during decomposition of LDH. However, the heat treated samples still preserve the morphology of the original LDH plates. Periclase-like formed from LDH heat treatment may re-hydrolyze and recover the structure of LDH. However, crystallinity of the recovered LDH is lower than that of the original LDH. This heat treatment will result in formation of （Mg, Al）-oxide nano-crystals and nanopores among the nano-crystals. When heating temperature exceeds 1000, the periclase-like （Mg, Al）-oxide is transformed into a composite with periclase （MgO） and spinel phases. The periclase can be re-hydrolyzed and dissolved in HCl solution. After acid treatment, the sample with a high surface area is composed of spinel nano-crystals and nanopores among them. Our results will provide a new and economic way to synthesize mesoporous materials through pathways of phase transformation of precursor materials with different composition.  相似文献   

桩锚支挡体系在广西寨-任二级公路高边坡治理工程中的应用   总被引：3，自引：0，他引：3  

胡华敏  胡杰刚  俞敏  全洪波  兰高 《中国地质灾害与防治学报》2006,17(3):150-153

(六)寨-(水)任二级公路施工后,滑坡、坍塌、崩塌现象甚多,边坡治理迫在眉睫。桩锚支挡体系是一项主动性加固边坡技术,具结构轻巧、用材合理、施工简单、工期短、费用低等特点。论文通过其在(六)寨-(水)任二级公路K56段高边坡治理工程中的应用,对桩锚支挡体系的设计及施工要点作了介绍。  相似文献   

推进"12319"城建服务热线与城市数字化管理联动努力提高城市综合管理和公共服务水平     

上海市建设和交通委员会 《中国勘察设计》2006,(2):13-14

“12319”城建服务热线和数字化城市管理，是建设部大力倡导和推进加强城市管理的重要抓手，近年来，上海在全力推进“枢纽型，功能性、网络化”基础设施建设，不断增强城市功能，改善城市形象的同时，积极探索“12319”服务热线与数字化管理工作的结合，努力提高城市管理水平。  相似文献   

四川盆地南部志留系碳酸盐泥丘储层发育特征   总被引：1，自引：0，他引：1  

赵文智  杨晓萍  Steve KERSHAW 《地质学报》2006,80(10):1615

灰泥丘主要发育在台缘斜坡及台地内部水体比较安静的缓坡环境中,缓坡环境和较弱的水动力条件是形成灰泥丘的两个重要条件。通常情况下礁、丘不相互共生。灰泥丘主要由微生物(蓝藻及其它微观藻类、细菌等)建造的,或者以微生物为主、并有其它多门类生物(珊瑚、苔藓虫、层孔虫、海绵、棘皮、头足、腕足、多门类钙藻等)参与建造的,是主要由灰泥组成、具有穹形特征的碳酸盐岩建隆。其中,灰泥是指粒径小于0.01mm或0.005mm的碳酸盐矿物,而非陆源粘土矿物,是热带、亚热带静水环境中沉积的特有产物之一,并主要由微生物通过新陈代谢、光合作用胶结固化…  相似文献   

玛纳斯河一级电站引水渠沿线提取地下水进行融冰的可行性研究     

王春得 《地下水》2005,27(5):347-349

通过对向斜洼地含水层水文地质特征的勘探及研究,对研究区的水文地质边界条件进行了概化,并用水均衡法估算了地下水资源量,对拟建一级电站引水渠沿线提取地下水进行融冰的可行性进行了研究,并提出了取水方案.  相似文献   

德国岩溶水勘查技术与开发利用概况   总被引：2，自引：0，他引：2  

王宇  李丽辉 《水文地质工程地质》2005,32(6):91-95

文章介绍了德国南部岩溶区的自然地理地质概况、水文地质特征,引入了德国水文地质学家关于岩溶水文地质垂向分带的概念模型,着重评述了多电极地电探测、地面穿透雷达、地面核磁共振三种先进的地球物理探测方法,并对德国岩溶水开发方式及保护措施进行了具体的分析,介绍了德国民众对地下水、矿泉水的认识,最后进行了德国岩溶水勘查技术与国内现状的对比评价,明确了我们应当学习和引进的先进技术。  相似文献   

从电法勘探资料分析宋楼煤矿主斜井突水因素     

时晗 《物探与化探》2005,29(2):135-137

根据宋楼煤矿主斜井直流电法勘探资料及矿井地质及水文地质条件的分析,煤矿主斜井突水原因应该是来自第四系砂砾石含水层及深层地下岩溶水。通过电法勘探确定裂隙发育带、富水区域、涌水部位,对此处实施钻孔注浆堵水后,恢复生产。  相似文献   

笼状水合物拉曼光谱特征与结构水合数的耦合关系   总被引：3，自引：0，他引：3  

雷怀彦  官宝聪  刘建辉  李震 《现代地质》2005,19(1):83-88

为了探讨不同气体组分和环境介质对形成笼状结构类型水合物和水合数的影响, 开展了一元体系 (CH4、CO2、C3H8 )和二元体系(CH4 +CO2、CH4 +C3H8、CH4 +N2 )的水合物生成结晶充填过程、结晶构型和动力学特性分析, 并对生成的水合物进行了拉曼光谱分析。结果表明单组分甲烷充填小孔穴 512和大孔穴 512 62 形成Ⅰ型笼状结构水合物(SⅠ), 二氧化碳和丙烷只占据大孔穴 512 64 形成Ⅱ型笼状结构水合物 (SⅡ ); 而二元混合组分中小孔穴中只充填有甲烷, 而没有CO2、N2 和C3H8。应用反褶积的ν1 对称谱带测定了CH4 分子在Ⅰ型结构大孔穴和小孔穴中的相对占有率,并根据谱带的面积比(对应于小孔穴与大孔穴)计算了平衡条件下甲烷水合物孔穴占有率及其耦合的水合数, 认为气体分子的大小不仅影响它所充填的孔穴形态和类型, 而且影响水合物生成的结构类型和水合数。  相似文献