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901.
Zhu Xiaobin Xu Weihai Wang Xinting Huang Xinping Deng Liping Kang Xinglun Jiang Zhigang Ma Xuli 《中国海洋湖沼学报》2005,23(1):39-42
Heavy metals pollution in Jiaozhou Bay was studied inRuditapes. philippinarum, a bioindicator of seawater pollution. Heavy metals in soda industry wastes “white mud” were also studied. Comparison of
microwave digestion method with general digestion method revealed that microwave digestion is superior to general digestion
in precision, recovery, digestion speed and efficiency, etc. Cd concentration in HongdaoR. philippinarum samples exceeded the national standard by 0.046 mg/kg, that of Yinghai sample by 0.02 mg/kg, and that of Hongshiya sample
by 0.22 mg/kg. Sample Pb concentration in Hongshiya was found to exceed the national standard by 0.02 mg/kg. However the heavy
metals concentration inR. philippinarum near the Qingdao Alkaline Factory was complied with the standard. This was proved byPenaeus chinensis culture experiment. Therefore, the possible contamination source may come from other land areas.
This study is supported by Project 973 (NO.2002CB 412402), and key project of the Chinese Academy of Sciences (Grant NO.KJCX315W-215). 相似文献
902.
�İ�������������ǰ�ױ仯�������� 总被引:2,自引:2,他引:0
????????????£??????????????????????仯????????????????????????????????仯?????????????????????????????????????????????????±仯??????????????????????塣???????????????????仯?????????????????????????????????????о???????? 相似文献
903.
904.
尖紫蛤分布于我国东南沿海,在广东鉴江它的栖息密度为3.5~7.0个/m~2。生活在比重1.0006~1.0007,水温19.2~30.8℃,pH 值6.9~7.2.流速0.243~0.704m/s,透明度为0.38~0.60m 的咸淡水交汇处,从低潮区至水深3m 的沙滩均有分布,栖息深度一般为0.30~0.50m,最深可达0.70m。食料以底栖硅藻和有机碎屑为主。雌雄异体,繁殖期在9~10月,一周龄个体平均大小为37.5mm×16.5mm×8.2mm。在鉴江尖紫蛤的年产量约5万kg。 相似文献
905.
Heavy metal research in lacustrine sediment: a review 总被引:2,自引:0,他引:2
Heavy metals are released into environment from a wide range of natural and anthropogenic sources. Aquatic ecosystems are normally at the receiving end and in many cases, with lakes as intermediaries. Lacustrine sediments are important sinks for heavy metals and play a significant role in enrichment and remobilization of heavy metals in aquatic systems. Therefore, characteristics of heavy metal in lacustrine sediments become one of the important issues in environmental sciences. Progress in heavy metal research of lake sediments since late 1980s is reviewed comprehensively in this paper from over 100. The Highlights are placed on the establishment of aquatic sediment quality guidelines, references chemical speciation of heavy metals, heavy metal transport mechanisms in lakes, and high-resolution study of lake borehole cores. Meanwhile, suggestions for heavy metal research in lacustrine sediment in the future are proposed, including such issues as using integrated approaches to assess aquatic ecosystem, modem lake dynamic process, high-resolution evolutionary sequence and spatial differentiation of environments and international lake database, which should be referential to the promotion of research on heavy metal in aquatic system. 相似文献
906.
塔里木盆地塔中-巴楚地区早二叠世岩浆岩的LA-ICP-MS锆石U-Pb年龄 总被引:2,自引:6,他引:2
运用阴极发光和LA-ICP-MS U-Pb法对塔里木盆地塔中-巴楚地区岩浆岩中的锆石年龄进行了测试。结果显示,玄武岩年龄275±13Ma,凝灰岩年龄291±10Ma,辉长岩年龄274±15Ma,辉绿岩年龄272±6Ma,正长岩年龄282±3Ma,英安斑岩年龄286±4Ma,均属于早二叠世。 相似文献
907.
Based on our previous study of the intermolecular potential for pure H2O and the strict evaluation of the competitive potential models for pure CH4 and the ab initio fitting potential surface across CH4-H2O molecules in this study, we carried out more than two thousand molecular dynamics simulations for the PVTx properties of pure CH4 and the CH4-H2O mixtures up to 2573 K and 10 GPa. Comparison of 1941 simulations with experimental PVT data for pure CH4 shows an average deviation of 0.96% and a maximum deviation of 2.82%. The comparison of the results of 519 simulations of the mixtures with the experimental measurements reveals that the PVTx properties of the CH4-H2O mixtures generally agree with the extensive experimental data with an average deviation of 0.83% and 4% in maximum, which is equivalent to the experimental uncertainty. Moreover, the maximum deviation between the experimental data and the simulation results decreases to about 2% as temperature and pressure increase, indicating that the high accuracy of the simulation is well retained in the high temperature and pressure region.After the validation of the simulation method and the intermolecular potential models, we systematically simulated the PVTx properties of this binary system from 673 K and 0.05 GPa to 2573 K and 10 GPa. In order to integrate all the simulation results and the experimental data for the calculation of thermodynamic properties, an equation of state (EOS) is developed for the CH4-H2O system covering 673-2573 K and 0.01-10 GPa. Isochores for compositions <4 mol% CH4 up to 773 K and 600 MPa are also determined in this paper. The program for the EOS can be downloaded from www.geochem-model.org/programs.htm. 相似文献
908.
Dispersal pattern of suspended sediment in the shear frontal zone off the Huanghe (Yellow River) mouth 总被引:1,自引:0,他引:1
Houjie Wang Zuosheng Yang Yunhai Li Zhigang Guo Xiaoxia Sun Yan Wang 《Continental Shelf Research》2007
The in situ records of a cruise in September 1995 off the Huanghe mouth and laboratory measurements indicate that the shear front off the river mouth results from the phase difference between the nearshore and offshore tides and plays significant role in the river-laden sediment dispersal. Two types of shear front, identified from the behaviors of currents inside and outside the shear front, alternate over tidal cycle, each of which lasts for ∼2–3 h. The dispersal patterns of suspended sediment at the stations inside and outside the shear front are distinctly different from each other. In addition, the gravity-driven hyperpycnal flow generated near the mouth is terminated within shallow water due to the barrier effect of shear front. A dispersal pattern of river-laden suspended sediment in the shear frontal zone is proposed to interpret the difference of sediment transport inside and outside the shear front. The fresh and highly turbid river effluents discharge to the sea during ebb tides and are transported northwestwards inside the shear front under the combined impacts of northward ebb currents, down-slope transport of hyperpycnal flow and confining action of shear front; after partially mixing with the ambient seawater the river effluents are then transported southeastwards outside the shear front along the flood currents, causing the intermittent increase in suspended sediment concentration and corresponding decrease in salinity outside the shear front. Over annual time scale the subaqueous slope has a geomorphological response to the ephemeral shear front. Most of the river-laden sediment deposit inside the shear front with a high accumulation rate, while erosion is dominant outside the shear front due to the lack of sediment supply. 相似文献
909.
910.