【摘要】 在枯水期、丰水期采集黄河口的表底层水样,分析全水样铜、铅、锌、镉、铬、砷、汞浓度。结果表明黄河口水中重金属浓度:丰水期>枯水期,且底层水总重金属浓度要高于表层。在从河入海过程中,总重金属浓度在河海混合过程阶段浓度变化较大,在枯水期整体上是由河向海的总重金属浓度逐渐降低,但部分金属在距离A03站位12.5 km附近有明显低值区,随后又有升高,主要原因为沉积物的再悬浮;在丰水期距离A03站点11.5~15 km,重金属浓度有低谷河段,随后又有一峰值,该位置比枯水期推后了约1.3 km。主成分分析表明,河水流量的大小和咸淡水的混合导致的泥沙的再悬浮和盐度影响到河海混合过程及河口重金属的浓度变化趋势。更多还原

【Abstract】 During high water and low water periods,water samples from the Yellow River delta were gathered,and the concentrations of Cu,Pb,Zn,Cd,Cr,As,and Hg were determined.The concentrations of heavy metals during the high water period were higher than those in the low water period,and the contents of heavy metals near the bottom were higher than those in the surface layer.From river to sea,the variation of heavy metal content is obvious.At low water period,the heavy metal content decreased from river to sea,but at the site 12.5 km from A03,there was an obvious low value area,and after which the content increased.The main reason for this was resuspension.During high water periods,at the places 11.5 to 15 km from A03,the content of heavy metals decreased obviously,and then a peak value appeared,at about 1.3 km from the place for peak content to appear during low water period.The factor analysis showed that the resuspension of mud and sand and salinity caused by river runoff and the mixture of fresh and salt water was the main reason of the variation of heavy metal content in the Huanghe estuary water.更多还原