中文摘要：

河口地区潮滩是重金属重要的“汇”。测定了灌河口（燕尾港）潮滩高中低滩的33个表面样粒度、重金属数据，研究了4根柱状样的重金属和粒度特征，利用地累积指数法、潜在生态危害指数法及富集指数法等评价指标，对灌河口重金属的污染状况进行了评价，并对其结果进行了相互比较和印证。分析结果显示，灌河口潮滩重金属的分布主要受水动力影响，特别是受粘土分布的控制。Cd与粒径Φ值相关性不显著，相关系数只有0．099，而与粘土含量呈明显正相关关系，Hg的变化趋势恰恰相反，其含量随着距离河口距离的加大反而有增加的趋势；其他元素的变化趋势不明显。重金属元素Zn、Pb、Cu、Hg含量变化走势基本相同，用Ⅱ作归一化标准元素归一化后，所有重金属元素的归一化值变化波动范围均比重金属含量值明显收窄，波峰和波谷有后延的趋势。灌河口滩涂总体重金属环境尚可，但存在一定程度的Hg、Cu污染富集。柱状样Hg、Cu的地累积污染指数总体上均呈现随深度增加而降低的趋势。

英文摘要：

The tidal flat in estuaries is an important ＂sink＂ of heavy metals. The grain sizes and heavy metal contents of 33 surface samples from the inner, middle and outer flats and of 4 core samples in Guanhe Estuary （Yanweigang） are determined. Index of geoaccumulation Igeo, potential ecological risk index R/and sediment enrichment factor KSEF are used to evaluate enrichment and pollution of heavy metals in Guanhe Estuary, and the evaluation results were compared and confirmed. The analytical results show that the distribution of heavy metals in Guanhe Estuary is mainly controlled by the estuarine tidal hydrodynamic system and particularly by the distribution of clay. Cd content has a weak correlation with the Φ value of grain size with a correlation coefficient of only 0. 99, but correlated closely with the clay content. Hg has a contrary distribution trend： its content increases with increasing distances from the estuary. Changes of contents of other elements are not so obvious with increasing distances from the estuary. The vertical distributions of Zn, Pb, Cu and Hg are almost the same on the whole. The vertical Li-normalized patterns of all the heavy metals have much narrower variation ranges than those of the original ones, and have a trend of deferred peaks and valleys with unchanged basic fluctuation trends. The environment in Guanhe Estuary is fairly good, only Hg and Cu reach a certain degree of pollution levels. The Igeo of Hg and Cu of a core sample shows overall decreasing trend with depth, showing an increasing trend of Hg and Cu pollution year after year. s：