相同污染浓度条件下，粗颗粒沉积物中重金属具有较高的初期释放量和释放强度；平衡释放浓度随粒度减小略有增大。考虑到沉积物吸附重金属的粒度效应，重金属释放的粒度效应会更加明显。渭河沉积物中构成重金属释放的结合形态主要为离子可交换态和碳酸盐结合态。重金属结合形态相互转化的结果是以水相中重金属释放浓度变化的动力学过程来体现的。 Under the same pollution concentration, the heavy metals in the coarse-grained sediments had higher initial release and release strength; the equilibrium release concentration slightly increased with the decrease of the grain size. Taking into account the sediment adsorption of heavy metals particle size effect, the particle size effect of heavy metal release will be more pronounced. The binding forms of heavy metals in the sediments of Weihe River are ion-exchangeable and carbonate-bound. The result of mutual transformation of heavy metal binding forms is reflected by the kinetic process of the change of heavy metal released concentration in aqueous phase.