贵州梅树村期多金属矿沉积地质特征   总被引：1，自引：1，他引：0  

谢海  王天华  曾湘贵 《贵州地质》2008,25(4)

贵州早寒世武梅树村期黑色岩系黑色岩系中的Mo、Ni、V等多金属矿与沉积环境的关系密切,形成不同的多金属组合,可分为粘土岩型钼钒矿和黄铁矿型镍钼矿和粘土岩型钒矿三种组合,分布于不同的沉积相区,可能为深源物质封闭海域沉积作用的产物。  相似文献   

浙江西沪港重金属铜的配位容量和形态分析   总被引：3，自引：2，他引：3       下载免费PDF全文

吕海燕  王正方  傅和芳  冯旭文 《海洋学报》2003,25(3):47-52

根据2000年6月10～14日在浙江省西沪港采集的海水样品,利用AA-800石墨炉原子吸收分光光度技术和阳极溶出伏安法测定样品中重金属铜的含量,获得铜在海水中受不同的有机配体控制.不同粒级的铜表观配位容量表明西沪港海水过孔径1.00μm微孔膜的(ACuCC)较高,为144.4nmol/dm3;过0.40和0.20μm滤膜的(ACuCC)分别为103.0和102nmol/dm3;铜的有机配体条件稳定常数的对数值在7.25～9.14之间.铜的总量为21.72nmol/dm3.铜全部为稳定溶解态,其中pH2酸溶态占95.0%,强有机结合态占5.0%.溶解态铜中有机结合态占过滤海水中总铜的61.6%.  相似文献   

Sensitivity to stress of the estuarine bivalve Macoma balthica from areas between the Netherlands and its southern limits (Gironde)     

H. Hummel  C. Amiard-Triquet  G. Bachelet  M. Desprez  J. Marchand  B. Sylvand  J.C. Amiard  H. Rybarczyk  R.H. Bogaards  J. Sinke  Y. De Wit  L. De Wolf 《Journal of Sea Research》1996,35(4):315-321

Variation in the sensitivity to stress of Macoma balthica was measured in several French and Dutch estuaries. For adult and juvenile Macoma balthica exposed to copper under conditions of starvation, differences in mortality rate, condition, glycogen, burrowing rate and copper content were assessed. No significant differences were observed between adults and juveniles; the influence of treatment and origin was always evident. Animals from the most southern estuaries, Loire and Gironde, near to the species's southern limit of distribution, showed, in the field, the strongest deviations for the ecophysiological traits measured, and were in the experiments the most sensitive to stress.  相似文献   

珠江口水体中铜与悬浮颗粒物相互作用的研究     

丘耀文  王肇鼎  张正斌  刘莲生 《热带海洋学报》1995,(4)

使用无机离子交换法研究珠江口水体中铜与悬浮颗粒物的相互作用，测出钢与悬浮颗粒物相互作用的ｐＨ曲线呈Ｓ形，其分级离子交换等温线是一种新的“台阶”型；从分级离子交换理论求得分级平衡常数Ｋ１为５．０，Ｋ２为７８．１，珠江口水体中铜的表观络合容量为０．９２μｍ及其条件稳定常数为３．５×１０７。  相似文献   

中国明对虾(Fenneropenaeus chinensis)血细胞中一氧化氮合成酶的鉴定及其在白斑综合症病毒感染过程中的变化   总被引：11，自引：0，他引：11  

姜国建  于仁诚  王云峰  颜天  周名江 《海洋与湖沼》2004,35(4):342-350

诱导型一氧化氮合成酶(iNOS)在生物机体免疫，特别在无脊椎动物免疫中的作用近来得到了广泛的关注，由其催化产生的一氧化氯(NO)除具有已知的神经传导、松弛平滑肌等功能外，还具有抗菌、抗病毒、抗寄生虫等作用。作者通过硝基四氯唑蓝(NBT)法和血细胞形态观察等方法，对中国明对虾(Fenneropenaeus chinensis)血细胞中存在的诱导型一氧化氮合成酶进行了初步鉴定。在此基础上，通过亚硝酸盐法和L-瓜氨酸法对比，研究了感染白斑综合症病毒(WSSV)后中国明对虾血细胞中一氧化氯合成酶的变化情况。结果显示，中国明对虾在感染WSSV后，iNOS活性在12h内有上升趋势，实验36h后酶活性显著下降，至60h后酶活性降至对照组的一半左右。同时，被脂多糖(LPS)诱导的一氧化氮合成酶活性与对照相比也有显著下降。与此对应的是，核酸探针斑点杂交法检测病毒的结果显示：实验36h后在对虾体内能够检测到白斑综合症病毒。对照组中国明对虾血细胞的iNOS在实验过程中基本保持稳定。这说明WSSV在感染中国明对虾初期可以诱导血细胞产生iNOS，但随着WSSV在中国明对虾体内的大量增殖及其对血细胞的破坏，使得iNOS活性显著降低，对虾也趋于死亡。因此，iNOS能够作为反映对虾在病毒感染过程中健康状况的有效指标。  相似文献   

Study on copper complexing ligand concentrations in several China’s coastal waters     

GONG Haidong  ZHANG Zhengbin  LIU Chunying  LIU Liansheng 《海洋学报(英文版)》2006,25(1):64-77

Copper complexing ligand concentrations in the Daya Bay, Qingdao coast, Jiaozhou Bay, South China Sea and Huanghe Estuary waters were determined by the anodic stripping voltammetry technique. The distribution regularity and the relationship with other parameters were discussed. The results were as follows: Copper complexing ligand concentrations of the South China Sea were a little higher than those of other sea areas, and they were apparently higher than those of the ocean. Compared with the subsurface layer (SSL) in the sea surface microlayer copper complexing ligand concentrations showed an enrichment phenomenon, of which the mechanism is similar to dissolved organic matter. The metal complexing ligand concentration profiles of the South China Sea showed that the value in the sea surface was the highest, then it decreased with depth accruing, and a higher value appeared at the bottom. Copper complexing ligand concentrations were higher than those of cadmium and lead. Ligands in each sea area exhibited a complicated property. In short, the distribution regularity of copper complexing ligand concentrations in China' s coastal waters was consistent with that of other regions in the world. Meanwhile, the positive relationship between the copper complexing ligand concentrations and biological oxygen demand, chemical oxygen demand, dissolved organic carbon, and viscosity were found clearly.  相似文献   

海上矿石运输最优船队的组建     

董胜 《中国海洋大学学报(自然科学版)》1997,(2)

针对海上矿石运输，介绍了一种完成定量任务并能使投资费用最少为目标的最优船队组建方法，同时对易变参数进行了灵敏度分析，使决策更加科学化  相似文献   

Distribution of dissolved species and suspended particulate copper in an intertidal ecosystem affected by copper mine tailings in Northern Chile   总被引：1，自引：0，他引：1  

Santiago Andrade  James Moffett  Juan A. Correa   《Marine Chemistry》2006,101(3-4):203-212

The coastline near Chañaral in Northern Chile is one of the most highly Cu-contaminated zones in the world due to discharges from mining activities for more than 60 years. The speciation of Cu has been studied to determine the importance of organic complexation in highly contaminated areas, and to assess the likely physiological impacts of Cu on marine organisms. Dissolved Cu concentrations of up to 500 nM were measured, completely saturating organic ligands and leading to free Cu²⁺ concentrations in excess of 10^− 8 M. These values are higher than those reported in any other marine environment, and because they occur over an extensive area, provide a unique opportunity to study the effects of Cu on marine ecosystems and to see how Cu behaves when its speciation is predominantly inorganic. We found strong gradients in free Cu²⁺ between Chañaral and adjacent areas with lower Cu, where speciation is dominated by organic complexation. There is also a significant increase in the partitioning of Cu onto suspended particles in the contaminated areas, consistent with previous studies that showed that organic ligands stabilize Cu in the dissolved phase, whilst “excess” Cu is rapidly scavenged. Those high dissolved Cu concentrations persist in spite of solid phase partitioning and advective processes along this open-ocean coastline, suggesting that Cu inputs into the system are still very large. Measurements were made using anodic stripping voltammetry with a thin mercury film coated with Nafion, which previous workers have shown can mitigate ambiguity in the data arising from inadvertent reduction of organic complexes. Our findings suggest that this is a useful methodology for contaminated systems.  相似文献   

盐酸羟胺-盐酸体系提取黄土中游离氧化铁     

孙玉兵  谢巧勤  陈天虎 《海洋地质与第四纪地质》2007,27(3):133-136

黄土中游离氧化铁是指示夏季风的替代性气候指标之一。使用经典的CBD法提取游离氧化铁实验过程烦琐,而且实验条件不同对浸提结果影响很大。本实验采用盐酸羟胺-盐酸体系在不同的温度下浸提黄土中的游离氧化铁。实验结果表明:温度对实验结果影响最大,盐酸浓度次之。与经典的CBD法进行对比,在一定的条件下可以代替CBD法,从而简化试验。  相似文献   

南黄海陆架中部沉积物反射率光谱的影响因素分析     

王昆山  石学法  程振波  王国庆  葛淑兰 《海洋科学进展》2007,25(1):46-53

利用Minolta CM-2002光谱光度计对南黄海陆架136个短柱样品20~25cm段的沉积物进行了颜色反射率数据测量,通过化学元素、粒度、磁化率等来确定影响沉积物颜色反射率变化的成分和因素,介绍了反射率光谱的一阶导数和因子分析的方法。分析结果表明,南黄海陆架沉积物颜色反射率受控于沉积物中的铁氧化物、有机质以及粘土矿物和钙质生物碎屑含量。主因子F1指示氧化环境,并与陆源物质相关,F2指示弱氧化环境,F3指示弱还原环境,主因子的波长范围分别是405~445 nm和495~595 nm,605~695 nm,445~485 nm。  相似文献