【摘要】 沉积物中不同成分的稳定性对重金属的迁移转化有重要影响。按照在自然条件下不同成分的稳定性将沉积物分为3个组分(轻组(LF)、腐殖质(HS)、去除HS的重组(HFRHS))。研究了铜在沉积物及其不同组分上的吸附动力学、吸附等温线以及pH对吸附的影响。结果表明,在沉积物中,LF与HS对吸附铜的速率起控制作用,而HFRHS是主要的吸附组分,pH对铜的吸附有较大影响。在自然环境中,控制LF和HS的迁移转化,可以有效降低铜的迁移能力,减小对环境的影响。更多还原

【Abstract】 The stability of different component of sediments has an important impact on migration and transformation of heavy metals.Sediment sampled in Shenzhen Longgang River is divided into three groups of Light Fraction(LF),Humic Substance(HS) and Heavy Fraction of Remove Humic Substances(HFRHS) according to their stability under natural conditions.The characteristic of copper adsorption on these three components is investigated from adsorption kinetics and adsorption isotherms,and the effects of pH on copper adsorption are studied.The results showed that the adsorption rate of copper was controlled by LF and HS,while stabled HFRHS was dominant component for copper adsorption.pH had a great influence on copper adsorption on LF and HFRHS,and maximum adsorption capacity was found when pH was 7.Therefore,in natural environment,the transferability and environmental toxicity of copper could be reduced by controlling the migration and transformation of LF and HS.更多还原