Organochlorines and dioxin-like compounds in green-lipped mussels Perna viridis from Hong Kong mariculture zones     

So MK  Zhang X  Giesy JP  Fung CN  Fong HW  Zheng J  Kramer MJ  Yoo H  Lam PK 《Marine pollution bulletin》2005,51(8-12):677-687

Concentrations of persistent organic pollutants including polychlorinated biphenyls (PCBs), organochlorine (OC) pesticides and dioxin-like compounds were measured in green-lipped mussels, Perna viridis, collected from seven mariculture zones in Hong Kong between September and October in 2002 in order to evaluate the status, spatial distribution and potential sources of pollution in these areas. Concentrations ranged from 300 to 4400 ng/g lipid weight for total OCs and 170–1000 ng/g lipid weight for total PCBs (based on 28 congeners). Relatively smaller DDT concentrations in mussels compared with previous studies suggest reduced discharges of DDTs from nearby regions into Hong Kong waters. Detection of a mixture of HCH isomers in the mussels indicated that Hong Kong waters were predominantly contaminated by technical HCHs rather than lindane. Mussel samples from all sampling locations elicited significant dioxin-like activity in the H4IIE-luc bioassay. The greatest magnitude of dioxin-like response (39 pg TEQ/g wet wt.) was detected in mussels from Ma Wan in the western waters of Hong Kong, which is strongly influenced by the Pearl River discharge. Human health risk assessment was undertaken to evaluate potential risks associated with the consumption of the green-lipped mussels. Risk quotient (RQ) for dioxin-like compounds was greater than unity suggesting that adverse health effects may be associated with high mussel consumption.  相似文献   

地壳浅部导电性矿物的一种新的压溶机制：应力原电池过程   总被引：3，自引：0，他引：3  

李和平 《矿物学报》1998,18(1):80-83

以黄铁矿为例,通过导电性矿物的力学-电化学相互作用实验,得出：导电性矿物的电极电位与弹性轴压应力是较好的负线性相关关系。以此为基础,通过电化学理论分析,得出：地壳浅部与溶液接触的导电性矿物颗粒内部存在各种各样的应力原电池,通过应力原电池过程,压溶作用得以实现。导电性矿物应力原电池引起压涛作用的发现,无疑对诸如构造地球化学、地电化学甚至湿法冶金等领域的有关研究具有重要意义。  相似文献   

新矿物(19931～199312)     

黄蕴慧  蔡剑辉  曹亚文 《岩石矿物学杂志》1998,(2)

本文以表格形式列举了１９９３年１月至１９９３年１２月经《国际矿物学协会（ＩＭＡ）新矿物与矿物命名委员会（ＣＮＭＭＮ）》批准并在各国矿物学杂志上发表的４２个新矿物的中文英文名称、化学式及其他数据。数据依次为：矿物的晶系、空间群、晶胞参数、主要粉晶数据（Ｉ、ｈｋｌ）、物理性质（晶形、颜色、条痕、光泽、解理、发光、硬度、密度等）、光学性质（一、二轴晶,正、负光性,折光率,反射率,双反射,２Ｖ,色散,吸收性,多色性等）、产状、共生矿物等。  相似文献   

Study on seismic numerical model on the Chinese mainland and its vicinity     

焦明若  张国民  刘杰  车时 《地震学报(英文版)》1999,12(6):632-639

IntroductionSeismicprocessisextremelycomplicatedjustashasbeenprovedbytheeallhquakepredictionpractice.Thecomplexityofseismicprocessmainlydisplaystheinhomogeneityofseismicspace-timedistribution.Therearealotoffactorscausingthecomplexity,includingthemediumofseismicsource,themechanicalprocessofseismicsource,mutualeffectofgroupseismicactivity,andsoon.Studyontheseismicactivitylawstillremainsinalowlevel,especiallyintheaspectofseismicoccurrenceprocess.Manyscholarstrytostudytheseismicactivebehavioringr…  相似文献   

气候系统可预报性的全局研究   总被引：15，自引：4，他引：11       下载免费PDF全文

范新岗  张红亮  丑纪范 《气象学报》1999,57(2):190-197

胞映射方法是对非线性系统进行全局分析的强有力工具。文中基于一个最大简化的地－气耦合模式,引入胞映射全局分析方法,对气候系统的可预报性进行了全局的研究。气候系统存在最大可预报期限,对于超过逐日预报可预报期限后的预报,用胞映射思想证明了平均值的可预报性,并得到了定量的结果。研究表明,耦合机制具有延长可预报期限的作用,观测精度的提高亦可延长可预报期限  相似文献   

矿物粉尘表面活性位及其变化分析   总被引：6，自引：3，他引：3       下载免费PDF全文

董发勤  万朴  冯启明  宋功保  彭同江  李平  李国武 《岩石矿物学杂志》1999,18(3):264-272

本文通过酸碱蚀,强机械力和极性分子等表面作用,利用红外吸收光谱手段分析了７放物粉尘的表面基团裸露,转化过程,总结了矿物粉尘表面存在的基团类型及其表面活性位的分布及在不同环境条件下的转化,对讨论粉尘生物活性及矿物表面／细胞物理化学作用过程有重要意义。  相似文献   

新疆萨尔布拉克金矿找矿矿物学标型特征研究   总被引：2，自引：1，他引：2  

吕瑞英 《地球科学》1990,15(6):657-665

  相似文献   

陕西金堆城花岗岩类主要造岩矿物特征及其岩石学意义          下载免费PDF全文

聂凤军 《岩石矿物学杂志》1988,7(4):337-347

本文依据大量测试数据,对金堆城地区花岗岩类主要造岩矿物学特征同钼迁移富集成矿关系进行了探讨。研究结果表明:异常晶胞条纹长石和正长石以及富重稀土和具明显负铕异常的黑云母是含钼花岗岩类标型矿物,并且可作为花岗岩类岩石发育地区寻找隐伏钼矿体的指示性矿物。钾钠长石和斜长石的结构状态和成分不仅可以提供有关花岗岩类成因演化的信息,其矿物本身亦可成为钼的载体矿物。岩浆期后,强烈的热液蚀变作用可造成钾钠长石和斜长石分解,并且引起钼的释放,从而形成高品位钼矿石。  相似文献   

BP网络在位场解释中的应用     

朱晓军  申宁华 《吉林大学学报(地球科学版)》1995,(1)

介绍了ＢＰ网络的特点，阐述了它在位场资料解释中应用的方法、特点和可行性。通过模型计算证实了该方法在位场异常识别中的效果，正确率达９７％。此外，通过修改网络单元的激发函数，增强网络的稳定性和内插功能，使ＢＰ网络在多层密度界面反演中得到满意的结果，模型和实例计算证明了该方法的有效性。  相似文献   

Bioelectricity generation and remediation of sulfide contaminated tidal flat sediment     

《国际泥沙研究》2020,35(1):91-96

A dramatic decrease in the catch of shellfish has been observed due to the high amount of Acid Volatile Sulfide(AVS) in the tidal flats in Japan.In the current study,an evaluation of simultaneous bioelectricity generation and remediation of sulfide contaminated tidal flat sediment has been done.The sediment samples collected from Tokyo Bay and Yamaguchi Bay,Japan,have been used in the laboratory test.A 2 L cylindrical shaped Sediment Microbial Fuel Cell(SMFC) has been used to evaluate the remediation of both sediment samples in the laboratory.Three different electrode materials carbon felt,carbon fiber and bamboo charcoal were used in the experiments to compare their efficiency to reduce the AVS from the sediment and generate bioelectricity.It was observed that the AVS reduction was higher at 5 cm depths for the Tokyo Bay sediment(100%) compared to the Yamaguchi Bay sediment(60%).The larger grain size for the Tokyo Bay sediment was the probable reason for this.The maximum voltage was around 100 and80 mV for Tokyo Bay and Yamaguchi Bay,respectively.  相似文献