重金属从港湾沉积物释放到海水中的实验室研究
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摘要: 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。
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