Multielement analysis of deep-sea sediments by inductively coupled plasma mass spectrometry     

Ning Xia  Zhaohui Wu  Dongfa Guo  De Yao 《中国海洋大学学报(英文版)》2008,7(2):137-144

Marine sediments were dissolved by HNO3-HF-HCIO4 in a sealed container at low pressure; I-IF was evaporated in an open container and salts were dissolved in HCl by heating, then transferred to 2% HNO3 solution. A total of 45 elements, including Li, Be, So, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Rb, Sr, Y, Zr, Nb, Mo, Cd, In, Sb, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, TI, Pb, Bi, Th and U, were measured by inductively coupled plasma mass spectrometry (ICP-MS). Condi-tions and sample experiments showed that this procedure defines a good experimental method which has the advantages of clear interference, easy operation and reliable results. The concentrations of the 45 elements could be used for resource exploration, envi-ronmental assessment and academic research.  相似文献   

升降式深水网箱控制平台的尺寸设计     

郭根喜  陶启友 《广东海洋大学学报》2005,25(3):52-55

控制平台的宽度l与网箱主构架半径r正相关,设计时必须满足网箱框架外侧与平台的距离k大于零,其中:k=1-2+22r-h42+14l2+12r2-22rl,h4为控制平台高度,其受放置区水深h的制约,高度与水深的关系:h=h1+h2+h3+2h4+12H,h1为网衣缩结高度,h2为网衣底部重力装置高度,h3为重力装置到水底的距离,H为网箱放置区台风期预计最大波高。以“HDPE升降式圆形双浮管深水网箱”为应用实例,h=24 m,H=7 m,r=7.15 m,h1=7.0 m,h2=1.0 m,l=25 m,h4=5.0 m,在浪高5 m,风力10级的情况下,网箱系统工作正常。  相似文献   

华南伊迪卡拉纪"庙河生物群"的属性分析   总被引：4，自引：0，他引：4  

TANG Feng  唐烽  尹崇玉  刘鹏举  段德麟  高林志 《地质学报》2008,82(5):601-614

我国南方伊迪卡拉(震旦)系陡山沱组页岩中,保存了以"庙河生物群"为代表的宏体碳质压膜化石群,以大量底栖固着的多细胞藻类为主,还包含推测的后生动物和海绵动物、可疑的遗迹化石等多门类生物化石,化石类型多样、分异显著,代表着新元古代"雪球"冰期之后和寒武纪早期后生动物大爆发前夕地球早期多细胞生物的一次大规模的进化辐射事件。本文通过比较湖北秭归庙河和贵州江口翁会两个典型产地的宏体化石优势属种的形态特征,以及两地所处的沉积古环境,分析探讨了这些优势类别与现生多细胞生物(包括红藻、褐藻和绿藻三大高级藻类)的亲缘关系。研究表明,寒武纪之前大约35~10Ma间,各门类多细胞藻类广泛发育,与后生动物的先驱分子构成独特的古生态群落。  相似文献   

Biology and abundance of Cancer bellianus (Decapoda, Brachyura) around the Azores     

Pinho  M. R.; Goncalves  J. M.; Martins  H. R. 《ICES Journal of Marine Science》2001,58(4):896-903

  相似文献   

Polychlorobiphenyl and pesticide residues in monkfish Lophius piscatorius and black scabbard Aphanopus carbo from the Rockall Trough     

Mormede  Sophie; Davies  Ian M. 《ICES Journal of Marine Science》2001,58(3):725-736

  相似文献   

Experiments on the resuspension of estuarine sediments containing benthic diatoms     

V. N. de Jonge  J. van den Bergs 《Estuarine, Coastal and Shelf Science》1987,24(6)

A laboratory system was used to test the effect of water flow on the resuspension of mud and sand sediments and, specifically, benthic diatoms from the Ems estuary, The Netherlands. Current velocities generated by two rotating cylinders in a cylindrical tank were determined by a small float and a laser Doppler velocimeter. At low angular velocities, the amount of suspended matter increased linearly with angular velocity and the float current velocity. However, at higher angular velocities, the increase in current velocity was less because of the strong turbulence: concomitantly, the current velocity boundary layer (δ) became thinner and the suspended matter concentration increased rapidly. The dominant diatom species from the sandy sediment were suspended in two distinct groups, one of which consisted of the species Navicula aequorea, Navicula salinicola, Ophephora martyi and Opephora pacifica, and was more exclusively bound to sand grains than the other. The benthic diatom species inhabiting the silty sediment did not show this difference. The most important shortcoming in the experiments was the inability to determine the radial and vertical velocity components. This precluded reliable calculations of the shear stress. The data presented emphasize the importance of finding a method to determine the shear stress under experiments and field conditions so that direct comparisons can be made. Despite this it is assumed that, just as under the experimental conditions discussed, under natural conditions in shallow waters resuspension starts at current velocities as low as ca. 10 cm s⁻¹.  相似文献   

Impact of small-scale biogenic sediment structures on bacterial distribution and activity in Arctic deep-sea sediments   总被引：1，自引：0，他引：1  

Nadia V. Quéric  & Thomas Soltwedel 《Marine Ecology》2007,28(S1):66-74

  相似文献   

Gene cloning and sequence analysis of the cold-adapted chaperones DnaK and DnaJ from deep-sea psychrotrophic bacterium Pseudoalteromonas sp.SM9913     

ZHAO Dianli  CHEN Xiulan  HE Hailun  SHI Mei  ZHANG Yuzhong 《海洋学报(英文版)》2007,26(6):91-100

Pseudoalteromonas sp.SM9913 is a phychrotrophic bacterium isolated from the deep-sea sediment.The genes encoding chaperones DnaJ and DnaK of P.sp.SM9913 were cloned by normal PCR and TAIL-PCR(GenBank accession Nos DQ640312,DQ504163).The chaperones DnaJ and DnaK from the strain SM9913 contain such conserved domains as those of many other bacteria,and show some cold-adapted characteristics in their structures when compared with those from psychro-,meso-and themophilic bacteria.It is indicated that chaperones DnaJ and DnaK of P.sp.SM9913 may be adapted to low temperature in deep-sea and function well in assisting folding,assembling and translocation of proteins at low temperature.This research lays a foundation for the further study on the cold-adapted mechanism of chaperones DnaJ and DnaK of cold-adapted microorganisms.  相似文献   

基于长基线系统深海采矿ROV精确定位   总被引：1，自引：0，他引：1  

杨放琼  谭青  彭高明 《海洋工程》2006,24(3):95-99

对于深海采矿集矿机ROV的定位,采用传统的长基线水声定位系统通常存在较大误差。对此提出了一种新的算法模型,首先通过比较集矿机测量位置与前一次修正位置的几何关系,对当前集矿机的位置进行修正,然后利用新的集矿机位置修正声速的数值,并得出重新修正后的集矿机测量位置。这样反复的多重迭代使得在某一时刻集矿机ROV的测量位置逐步趋近其理想位置,实现长基线系统的水声精确的三维立体定位。通过数值仿真分析,结果显示与传统的长基线水声定位方法相比,通过该方法获得的集矿机行驶轨迹能更好地趋近其理想行驶曲线,表明该算法的有效性。  相似文献   

大鹏湾盐田水域反曲原甲藻数量的时空变化特点     

林永水  周近明  林秋艳 《热带海洋学报》1995,(4)

对１９９０年３月３０日－５月５日广东大鹏湾盐田水域反曲原甲藻Ｐｒｏｒｏｃｅｎｔｒｕｉｎｓｉｇ－ｍｏｉｄｅｓＢｏｈｍ进行研究。详细分析了反曲原甲藻数量的时空变化及分布特点。多元回归分析表明：影响反曲原甲藻数量变化的环境因子，表层主要是亚硝酸氮，而底层仅与盐度相关。４月２０日盐田水域发生赤潮，经水样分析，发现表层水体中反由原甲藻数量很高（大于３００个·ｍｌ（－１）），占浮游植物数量的８６％以上。由此说明，反曲原甲藻是此次赤潮的原因种之一。本种通过扫描电子显微镜观察和分析所确认，并作了形态特征描述。  相似文献