共查询到19条相似文献，搜索用时 140 毫秒
1.
实验研究了一个中型水库（黄同水库）中几种主要微量营养元素（Ｆｅ、Ｍｎ、Ｚｎ、Ｃｕ、Ｍｏ）的存在形态、分布及其季节变动。主要结果为：（１）水库中Ｆｅ、Ｍｎ、Ｚｎ和Ｃｕ的平均总浓度分别为３６４．３、１１２．１、９６．０１和３．２４μｇ／Ｌ;Ｍｏ的溶解态平均浓度为３．２６μｇ／Ｌ。Ｆｅ和Ｍｎ以颗粒态为其主要存在形式,而Ｚｎ和Ｃｕ则以溶解态为主。（２）该水库５种微量元素的水平分布呈均匀化特征,但其浓度具有较明显的季节性变化。其垂直分布互有差异,Ｆｅ、Ｍｎ、Ｚｎ随水层深度增加而递减,而Ｃｕ和Ｍｏ的垂直变化甚小。（３）微量元素存在形态与水化学因子存在一定相关性,ＰＦｅ、ＰＺｎ、ＰＣｕ与ＤＯ间具有良好负相关,而ＤＺｎ、ＤＣｕ、ＤＭｏ和ＰＺｎ、ＰＦｅ与叶绿素间均呈紧密正相关。 相似文献
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九龙江口红树植物叶片重金属元素含量及动态 总被引：11，自引：0，他引：11
本文探讨了福建九龙江口潮间带秋茄、木榄、红海榄、白骨壤和桐花树等红树植物叶片重金属元素Ｃｕ、Ｐｂ、Ｚｎ、Ｃｄ、Ｍｎ的含量及动态。结果表明，该河口红树林区表层土壤沉积物元素含量顺序为Ｍｎ〉Ｚｎ〉Ｐｂ〉Ｃｕ〉Ｃｄ；５种红树植物叶片元素含量顺序为Ｍｎ〉Ｚｎ〉Ｃｕ〉Ｐｂ〉Ｃｄ；不同物种叶片元素含量大都有明显差异；叶片对土壤元素富集系数，以Ｍｎ、Ｃｄ较高，Ｐｂ最低；随叶片从幼叶－成熟叶－黄叶的生长发育，Ｍｎ 相似文献
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象山港重金属的环境化学特征 总被引：2，自引：0，他引：2
本文根据１９９０年６月和１１月对象山港海域进行的综合环境（水文、生物、化学）调查资料,分析了水体（包括溶解态、颗粒态）和沉积物的重金属（Ｃｕ、Ｐｂ、Ｚｎ、Ｃｄ、Ｃｒ）含量,运用元素的分布规律,探讨了该区的水动力因素、生物地球化学循环和沉积环境对重金属的影响,初步揭示了象山港重金属的环境化学特征。 相似文献
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珠江口水域微表层中的痕量金属 总被引：2，自引：0，他引：2
采用自制滚筒式自动采样器采样，研究了珠江口水域微表层中Ｆｅ，Ｍｎ，Ｃｕ，Ｐｂ，Ｚｎ，Ｃｄ的含量，分布变化及富集状况。并通过颗粒痕量金属／颗粒Ｆｅ比值计算，探讨了痕量金属的来源。结果表明：Ｃｕ，Ｐｂ，Ｚｎ，Ｃｄ在微表层平均富集系数分别为２．３，１．４，３．０和１．９颗粒态Ｆｅ，Ｍｎ的平均富集系数为１．１和０．９。各种金属有明显的季节和空间变化，有各种不同的来源。 相似文献
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山东近岸双壳类体内重金属的研究(英文) 总被引：3，自引：0，他引：3
１９９３年和１９９４年,分别在山东沿海地区（长岛、烟台、蓬莱、威海、青岛、崂山、黄岛和胶南）采集了一些常见的底栖生物（蛤、扇贝、贻贝、毛蚶和牡蛎等）,用火焰和无火焰原子吸收分光光度计测定了这些生物体中的重金属（Ｃｕ、Ｐｂ、Ｚｎ、Ｃｒ、Ｆｅ、Ｍｎ、Ｃｏ和Ｎｉ）。结果表明重金属的浓度变化较大,取决于生物种类、元素本身和采样点。采用金属污染指数（ＭＰＩ）比较了不同采样点生物体的金属总量,ＭＰＩ的变化顺序为：威海、崂山＜胶南、长岛＜青岛＜蓬莱＜烟台＜黄岛。将双壳类体内重金属的含量与最大允许浓度进行比较,表明在本调查范围内山东沿海地区大多数双壳类可食部分的重金属含量对人类健康还是安全的。 相似文献
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本文主要研究太平洋ＣＣ区多金属结核ＣＣＡ３３，ＣＣＢ２９，ＣＣＣ５０，ＣＣＣ１４生长过程中锰、铁、镍、铜的通量（ＦＭｎ），Ｆｆｅ，Ｆｎｉ，Ｆｃｕ）的变化规律。研究表明：１．结核生长过程中Ｍｎ、Ｆｅ，Ｎｉ和Ｃｕ的通量都是波动性的；２．ＦＭｎ与Ｆｆｅ，Ｆｎｉ，Ｆｃｕ均呈正相关性；３．结核的元素通量与结核的成因类型和生长阶段密切相关，并记录了海底缺氧事件；４．结核的元素通量存在区域性差异，是沉积环境不同 相似文献
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Lutz Brügmann 《Marine Chemistry》1988,23(3-4)
Between 1980 and 1984 extensive studies were carried out in the Baltic Sea on trace metals (Cd, Co, Cu, Fe, Hg, Mn, Ni, Pb and Zn) in water, suspended matter and sediments. The results enabled the influence of different factors on metal distribution patterns to be considered. The vertical profiles of dissolved and particulate metals in waters of the central deep basins reflect influences caused by oxygen deficiency and anoxic conditions in near-bottom water layers. Peculiarities at Station BY15 in the Gotland Deep included high dissolved Fe, Mn and Co concentrations and remarkable enrichment of Zn (0.64%), Cd (51 μg g−1) and Cu (0.15%) in particulate matter from the anoxic zone. Manganese-rich particles were accumulated above this layer.In fine-grained soft sediments below anoxic deep waters, maximum contents of Cd, Cu and Zn were observed, relative to other coring sites, between Bothnian Bay and Lübeck Bight. The Hg content in sediments probably reflects the joint flocculation with organic matter. Land-based sources seem to play the leading part for maximum lead contents. 相似文献
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The biogeochemistry of some heavy metals and metalloids in the Ob River estuary-Kara Sea section 总被引：1，自引：0，他引：1
L. L. Demina V. V. Gordeev S. V. Galkin M. D. Kravchishina S. P. Aleksankina 《Oceanology》2010,50(5):729-742
The biogeochemical behavior of the group of heavy metals and metalloids in the water (including their dissolved and suspended
particulate forms), bottom sediments, and zoobenthos was studied in the Ob River estuary-Kara Sea section on the basis of
the data obtained during cruise 54 of the R/V Akademik Mstislav Keldysh in September–October 2007. The changes in the ratios of the dissolved and suspended particulate forms of Fe, Mn, Zn, Cu,
Pb, Cd, and As were shown, as well as the growth of the fraction of adsorbed forms in the near-bottom suspended particulate
matter under the mixing of the riverine and marine waters. The features of the metals’ accumulation in the typical benthic
organisms of the Ob River estuary and the Kara Sea were revealed, and their concentrating factors were calculated based on
the specific conditions of the environment. It was shown that the shells of the bivalves possessing a higher biomass compared
to the other groups of organisms in the Ob River estuary play an important role in the deposition of heavy metals. The mollusks
of the Ob River estuary accumulate Cd and Pb at the background level, whereas the Cu and Zn contents appear to be over the
background level. 相似文献
13.
Concentrations of Cd, Cu, Cr, Co, Ni, Zn, Fe, Mn, Pb, As, and Sb were determined in sediment trap and bottom sediment samples collected seasonally from a station on the eastern Turkish coast of the Black Sea. Cd, Pb and Mn concentrations were highest in the sediment trap samples except during the summer period, whereas Co, Ni, Zn and Fe levels were much lower than corresponding levels found in the surface sediments. Cu, Cr, As and Sb levels showed no definite trend with sediment type. In general, with the exception of Cr, relatively lower metal concentrations in the sediment trap material were determined in the summer period. The highest mass flux, 56.5 g m−2 day−1, was measured during autumn. The highest flux of heavy metals also occurred during autumn and was strongly dependent on particle mass flux. Based on these results, we suggest that the downward vertical transport of particulate heavy metals in this region is related to the high degree of land erosion and the resultant particulate flux dynamics, which occur here. It was noteworthy that the highest concentrations of Cd, Cu, Co, Zn, Fe and Sb in particles were measured during winter a finding which suggests that enhanced fossil fuel combustion, which occurs during this period in adjacent urban and industrial areas plays an important role in the metal composition of sinking particles in nearshore waters. 相似文献
14.
Rob F. Nolting Wim Helder Hein J. W. de Baar Loes J. A. Gerringa 《Journal of Sea Research》1999,42(4):2393
Dissolved and particulate trace metals (Cu, Cd, Pb, Zn, Ni, Fe and Mn) measured at six stations along the Scheldt estuary in October/November 1978 are compared with more recent data. Based on Ca content in the suspended matter, three distinct geochemical regions could be distinguished: the upper estuary (salinity 1–7) dominated by fluvial mud, mid-estuary (salinity 7–17) where the composition of the suspended matter remained relatively constant, and the lower estuary where marine mud prevailed. Re-suspension of sediments is the major factor controlling the composition of the particles in the upstream region. Anoxic conditions prevailed in the upper part of the estuary extending to a salinity of 15 in 1978, while at present the seaward boundary of the anoxic water body is located at less saline waters. Furthermore, the present-day metal load is much lower than in 1978. As a consequence of the changed situation, maxima in dissolved concentrations of redox-sensitive metals in the mid/lower estuary have moved as well, which affects the trace metal re-distribution pattern. In the anoxic zone, exchange processes between dissolved and particulate metal fractions were strongly redox regulated, with Fe and Mn as excellent examples. Iron was removed from the dissolved phase in the early stages of mixing resulting in an increase in the suspended particulate matter of the leachable ‘non-residual' Fe fraction from 2 to 3.5%. Due to its slower kinetics, removal of Mn from solution occurred in mid-estuary where oxygen concentrations increased. Cu, Cd and Zn on the contrary were mobilised from the suspended particles during estuarine mixing. External inputs of Pb, and to a lesser extent of Cu, in the lower estuary resulted in the increase of their particulate and the dissolved concentrations. Calculated Kd (distribution coefficient) values were used to assess the redistribution between the dissolved and particulate phase of the investigated metals. Due to the existence of the anoxic water body in the upper estuary, the importance of redox processes in determining the Kd values could be demonstrated. The sequence of Kd values in the upper estuary (Fe, Cd, Zn, Pb > Cu > Ni, Mn) is significantly different from that in the lower estuary (Fe > Mn > Pb, Ni, Zn, Cu, Cd). Thus, in such a dynamic estuary single metal-specific Kd values cannot be used to describe redistribution processes. 相似文献
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van der Sloot Hans A Dirk Hoede Gert Hamburg Joost R.W Woittiez van der Weijden Cornelis H 《Marine Chemistry》1990,31(1-3)
In the anoxic hypersaline Tyro and Bannock Basins of the eastern Mediterranean, extremely high concentrations of Co (0.015%), Cu (1.35%) and Zn (0.28%) were found in suspended matter collected at the sharp interface between seawater and the anoxic brine. The high particulate Co, Cu and Zn concentrations can be explained by the sharp increase in dissolved sulphide at these interfaces, and the resultant precipitation of metal sulphides. The particulate As, Sb and Mo concentrations also showed a sharp maximum at or close to the interface. However, the contributions of As, Sb and Mo contents in suspended matter to the total concentrations in the water column are small. Scanning electron microscopy-energy-dispersive X-ray analysis (SEM-EDAX) of suspended particulate matter from the Tyro Basin revealed spherical particles strongly enriched in Fe, Cu and Zn at the seawater-brine interface. 相似文献
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厦门西海域沉积物中重金属的赋存状态及潜在迁移性 总被引：1，自引：0，他引：1
以厦门西海域沉积物为研究对象,利用改良BCR连续提取法分析了沉积物样品中Zn、Mn、Cr、Cu、Cd和Pb的赋存状态,并通过潜在迁移指数（PMI）探讨了沉积物中重金属的潜在迁移风险.结果表明：6种重金属总量在厦门西海域沉积物中由大到小的顺序为：Mn〉Zn〉Cr〉Pb〉Cu〉Cd,其中Mn和Zn的含量达到了1 471 mg/kg和231 mg/kg.与沉积物质量标准对比,沉积物样品中Zn、Cr、Cu和Pb的含量较高.改良BCR连续提取表明6种金属中Zn、Cr和Cu主要以残渣态存在,Mn和Cd主要以酸溶态存在,Pb则以可还原态为主.厦门西海域沉积物中6种重金属的潜在迁移指数大到小的顺序为：Mn〉Cd〉Zn〉Cu〉Pb〉Cr,其中Mn和Cd的潜在迁移危险最大. 相似文献
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Masahiro Sakata Masaki Yamada Satoshi Mitsunobu Yasuhiro Senga 《Journal of Oceanography》2012,68(5):807-813
The contribution of abiogenic and biogenic particles to trace-metal (As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, Sb, Ti, V, and Zn) composition was investigated for phytoplankton (primarily diatoms) collected in Shimizu Port, a coastal seawater region. Except for Cd, the trace metals occurred predominantly in lithogenic or nonlithogenic abiogenic particles associated with plankton. In contrast, it is likely that Cd in seawater is taken up intracellularly, and not adsorbed extracellularly by phytoplankton. The lower P-normalized quotas of Cd in Shimizu Port than in offshore regions may be because plankton are dominated by diatoms. 相似文献
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S. E. Fitzwater K. S. Johnson R. M. Gordon K. H. Coale W. O. Smith Jr. 《Deep Sea Research Part II: Topical Studies in Oceanography》2000,47(15-16)
Dissolved and particulate trace metal concentrations (dissolved Fe, Zn, Cd, Co, Cu and Ni; particulate Fe, Mn and Al) were measured along two transects in the Ross Sea during austral summer of 1990. Total Fe concentrations in southern Ross Sea and inshore waters were elevated >3.5 times that of northern waters. Dissolved Zn, Cd and Co concentrations were lower by factors of 4.5, 3.5 and 1.6 in southern surface waters relative to northern waters. Dissolved Cu and Ni concentrations were similar in both areas. Elevated Fe concentrations coincided with areas of increased productivity, phytoplankton biomass and nutrient drawdown, indicating that Fe is an important factor controlling the location of phytoplankton blooms in the Ross Sea. Particulate concentrations of Fe, Mn and Al indicate two possible sources of iron to the Ross Sea, resuspension of continental shelf sediments and iron incorporated in annual sea ice and released with meltwaters. 相似文献