顺序扫描ICP—AES法测定海洋沉积物中九种主要成分   总被引：2，自引：0，他引：2  

张爱滨  金红 《海洋湖沼通报》1998,(3):24-28

用ICP—AES法测定海洋沉积物中铝、铁、钙、镁、钠、钾、钦、锰、磷等九种主要成分,方法简便,省时省力,测量精密度小于4％,可以满足海洋地球化学的要求。  相似文献   

海湾扇贝幼虫变态诱导研究     

洪旭光  杨宇  阚金军  吴宝铃 《海洋科学进展》1998,(3)

本文在实验室条件下研究了海湾扇贝幼虫的诱导变态。研究结果表明肾上腺素、去甲肾上腺素、ｃ－ＡＭＰ、ＧＡＢＡ、赖氨酸和ＫＣｌ等６种诱导剂中,ＫＣｌ对海湾扇贝幼虫的变态诱导效果非常显著。ＫＣｌ对幼虫的诱导效应随ＫＣｌ浓度和作用时间的增加而增大,过高浓度则抑制幼虫的变态。受精１３ｄ后幼虫（２２±１℃）才对ＫＣｌ的作用着重产生明显反应。这为生产上提供了一种方便、价廉、安全的诱导变态方法,在海湾扇贝育苗工作有很大的应用前景。  相似文献   

珠江口表层水中主要常量离子的研究     

张力军  纪红  谢式南  陈国华  王渊 《中国海洋大学学报(自然科学版)》1998,(4)

９９４年９月采集了珠江口表层海水水样,并对其溶解态的Ｋ＋、Ｎａ＋、Ｃａ２＋、Ｍｇ２＋、ＳＯ２－４、Ｃｌ等化学要素进行了测定。结果表明,珠江口调查海域表层水中溶解态的Ｋ＋、Ｎａ＋、Ｃａ２＋、Ｍｇ２＋、ＳＯ２－４主要受陆源淡水与外海水物理混合稀释的影响,与Ｃｌ具有良好的直线正相关;Ｃａ２＋／Ｃｌ、ＳＯ２－４／Ｃｌ明显高于大洋水相应比值,Ｎａ＋／Ｃｌ、Ｍｇ２＋／Ｃｌ略高,而Ｋ＋／Ｃｌ比大洋比值低;在与中国其它各主要河口表层水对应Ｃｌ比较中,珠江口的ＳＯ２－４／Ｃｌ较高,而Ｃａ２＋／Ｃｌ,Ｍｇ２＋／Ｃｌ比值居低;上述各主要常量离子和Ｃｌ的等值线均沿自北向南走向递增。  相似文献   

Dynamics of DOC of euphotic layer in the Taiwan Strait——Diurnal variation of large range     

Peng Xingyue  Hong Huasheng  Shang Shaoling 《海洋学报(英文版)》1998,17(4):483-493

ThisstudywassupportedbytheStateEducationalCommittee(SEC)ofChina.INTRODUCTIONThedissolvedorganiccarbon(DOC),ordissolvedorganicmatter(DOM),isoneofthemostimPortantorganiccarbonreservoiroftheworld,whichmayaffectthecontentofCO2intheatmospherewithatime-scaleof1OOO~1OOOOyears(Hedges,1992).Theratesofproduction,degradationortransPortationofDOCareseveralmaindynamicalparametersofDOCintheeu-photiclayer.Inthispaper,wefocusonthediurnalvariationsofDOCinordertoestimatetheseparameters.METso…  相似文献   

The Kuroshio East of Taiwan and in the East China Sea and the currents East of Ryukyu Islands during early summer of 1996   总被引：6，自引：0，他引：6  

Yaochu Yuan  Arata Kaneko  Jilan Su  Xiaohua Zhu  Yonggang Liu  Noriaki Gohda  Hong Chen 《Journal of Oceanography》1998,54(3):217-226

Using hydrographic data and moored current meter records and the ADCP observed current data during May–June 1996, a modified inverse method is applied to calculate the Kuroshio east of Taiwan and in the East China Sea and the currents east of Ryukyu Islands. There are three branches of the Kuroshio east of Taiwan. The Kuroshio in the East China Sea comes from the main (first) and second branches of the Kuroshio east of Taiwan. The easternmost (third) branch of the Kuroshio flows northeastward to the region east of Ryukyu Islands. The net northward volume transports of the Kuroshio through Section K₂ southeast of Taiwan and Section PN in the East China Sea are 44.4×10⁶ and 27.2×10⁶ m³s⁻¹, respectively. The western boundary current east of Ryukyu Islands comes from the easternmost branch of the Kuroshio east of Taiwan and an anticyclonic recirculating gyre more east, making volume transports of 10 to 15×10⁶ m³s⁻¹. At about 21°N, 127°E southeast of Taiwan, there is a cold eddy which causes branching of the Kuroshio there.  相似文献   

胶州湾水体中的二氧化碳体系   总被引：1，自引：0，他引：1  

刘辉  姬泓巍  辛梅 《海洋科学》1998,22(6):44-47

采用库仑滴定法测定了胶州湾海域４个航次的总二氧化碳,根据测定的总二氧化碳的数据计算了二氧化碳各分量的含量及二氧化碳分压,得到了胶州湾水体中二氧化碳体系的平面分布、垂直分布及周日变化规律,并对结果进行了初步探讨 。  相似文献   

老挝爬立山铁矿二长花岗斑岩地球化学特征及其成矿意义          下载免费PDF全文

高建华  范文玉  吴振波  王宏 《沉积与特提斯地质》2015,35(3):102-108

老挝爬立山铁矿位于长山褶皱带北西端,为一个大型矽卡岩型铁矿床。铁矿化产于二长花岗斑岩的内、外接触带。二长花岗斑岩具有富碱,硅、铝过饱和的特征,属钙碱性岩。微量元素配分模式与正常大陆弧花岗岩类似,稀土配分模式为右倾轻稀土富集型,正铕异常,轻重稀土分馏明显,属下地壳重熔被动侵位形成的"S"型花岗岩。岩体U-Pb年龄为283±2.9Ma,侵位时间为早二叠世。爬立山铁矿床潜在资源量巨大,外围地区具有相同类型铁矿床的找矿远景。  相似文献   

黔北普宜地区晚三叠世二桥组砂岩碎屑锆石U-Pb年龄、重矿物分析及地质意义     

孙建勋  吴亮  肖长源  李鸿  李致伟  李辰 《地质学报》2022,96(3):824-839

普宜地区位于上扬子腹地——四川盆地东南缘,区内晚三叠世碎屑岩记录了上扬子前陆盆地演化信息,是研究盆地东缘盆山耦合的理想对象.二桥组主要由三角洲平原-三角洲前缘相砂岩组成,交错层理恢复的物源主要来自东侧,砂岩岩屑主要由岩浆岩岩屑和变质岩岩屑组成,碎屑重矿物主要由锆石、电气石、金红石、白钛石、黄铁矿、锐钛矿、石榴子石、铬铁...  相似文献   

Alkaline Phosphatase Activity and Utilization of Dissolved Organic Phosphorus by Algae in Subtropical Coastal Waters   总被引：7，自引：0，他引：7  

Bangqin Huang  Huasheng Hong 《Marine pollution bulletin》1999,39(1-12):205-211

Alkaline phosphatase activity (APA) and the availability of dissolved organic phosphorus (DOP) to marine algae were determined in Xiamen Bay and in algal batch culture systems. Results showed that APA changed with seasons, increasing to the highest value in summer and decreasing to the lowest in autumn and spring in Xiamen Bay. Tests on natural populations of planktonic algae and bacteria community showed that algae were mostly responsible for DOP utilization, while bacteria could not take up DOP compounds. Results from algal batch cultures also supported the above conclusion. Relationships between APA and environmental factors indicated that APA was negatively correlated with phosphorus level such as phosphate and small molecular DOP, and APA played an important role in utilization of DOP by algae. All the results emphasized the ecological significance of DOP in subtropical coastal waters.  相似文献   

深层搅拌桩在基坑支护中的应用     

曾宪荣  黄洪 《广东地质》1999,14(4):47-55

深层搅拌桩较适用于地下水含量大的软土地区,尤其适用于淤泥,粘土,粉土及松散砂等地区的基坑支护。在采用深层搅拌桩进行基坑支护时,其各种设计参数应按重力式挡土墙的设计方法进行计算,对挡土墙受力过大的长边,需加强档土墙结构;桩与桩间的搭接仅需１５ｃｍ,,即可起到护坡防渗效果;基坑开挖时必须进行变形监测和总结,以便发现问题肽时采取补救措施。  相似文献