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重金属从港湾沉积物释放到海水中的实验室研究 总被引:6,自引:2,他引:6
在100级洁净实验室中研究了厦门港沉积物中Pb、Cd、Cu、Zr、Ni和Co的释放与去除行为。沉积物加入海水后,Pb、Zn、Cu在8小时内释放达最大值,Co在12小时内达最大值;随后海水中Pb和Co的浓度逐渐下降接近背景值,Zn浓度略低于背景值,Cu的浓度变化不大;海水中Cd、Ni的浓度未见明显的变化。结果表明:弱结合态的重金属可能从沉积物中通过解吸或交换释放到海水中,同时它们又在海水中形成络合物或沉淀物,吸附在胶体或颗粒上被载带下来。这两个过程同时存在,随时间和条件变化而异。 相似文献
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THE CONCENTRATION AND DISTRIBUTION OF TRACE METALS IN THE SURFACE WATERS OF XIAMEN HARBOR 总被引:1,自引:1,他引:1
Dissolved, weakly and strongly bound particulates Cu, Pb, Zn, Cd, Co, Ni and Fe have been measured in the surface water sampled from eleven stations in Xiamen Harbor by clean laboratory methods and GFAAS. The average concentrations found in dissolved fractions are Cu: 0.41±0.12; Pb: 0.014±0.008; Zn: 0.084±0.043; Cd: 0.022±0.004; Co: 0.009±0.004; Ni: 0.15±0.02; and Fe: 0.15± 0.02 μg/kg, which make up 62%, 6%, 12%, 85%, 5%, 25% and <1% of the total metals in the surface water respectively. The results are mucn lower than those reported previously in the coastal waters of China. Industrial sources of trace metal contamination are likely responsible for the distribution of trace metals. 相似文献
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本文应用双硫腙-氯仿萃取质谱同位素稀释法(IDMS)和洁净实验技术相结合,分析了海水中痕量Pb、Cd和Zn,准确度好,精密度优于±3%,Pb、Cd和Zn的检出限分别为6×10-11、6×10-12和2.4×1010g.文中还讨论了过滤、酸化及消解等样品的前处理对海水分析结果的影响. 相似文献
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混合重金属(Cd,Cu,Pb,Zn,Hg)在厦门海洋围隔生态系中的迁移和归宿 总被引:4,自引:1,他引:4
1985年在厦门港海边水池内采用10m3围隔式生态实验装置研究了两组低浓度的混合重金属的迁移和归宿,溶解态金属浓度最初随袋内颗粒沉降呈指数形式下降,其去除速率Pb>Hg>Zn>Cu>Cd,其后由生物活动转为颗粒态,Zn在水华期明显地发生了生物转移,27天后Cd和Cu仍主要以溶解态形式存在,Pb和Hg大部分转移到沉降物中,Zn几乎各占一半,袋壁吸附不超过袋内金属的2%,浮游动物与重金属的结合很不稳定,有机质在重金属的迁移转化过程中起重要作用. 相似文献
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The release and removal behaviour of Cd, Cu, Co, Ni, Pb and Zn from the sediment of Xiamen Harbour to sea water have been studied under ultra-clean laboratory condition within 168 b. Initial rapid increases in dissolved Cu, Pb, Zn and Co were observed in the first six hours and twelve hours respectively after addition of various amounts of sediment. Then Pb and Co decreased to background values, while Zn decreased to less than the background value and Cu remained unchanged. Cd and Ni did not increase during the experiment. The results indicated that the weakly bound heavy metals were released from the sediment through desorption or exchange. Simultaneously, they might form complexes or be adsorbed in colloids or particles. The two processes existed simultaneously, changing with time and conditions. 相似文献
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