调水调沙对黄河口颗粒态金属分布的影响

摘要

Suspended particulate matter (SPM) samples were collected in the Huanghe (Yellow River) estuary before,during and after the Water-Sediment Regulation Scheme (WSRS) in June-July 2009.The concentrations of metal elements (Al,Fe,Mn,Cr,Cu,Ni,V,Zn) were determined by ICP-AES after digestion.Multivariate statistical methods were used to discuss the impact of the WSRS on the variability of particulate heavy metal concentrations and the pollution status in the Huanghe estuary.The results indicated that the concentrations of particulate heavy metals increased during the WSRS and decreased with the increase in salinity in the estuary.The variability of particulate metal concentrations reduced significantly after the normalization by Al,indicating the effects of grain size.Enrichment factor (EF) results showed that Cu and Zn were relatively enriched and the pollution was intensified after the WSRS.Concentrations of particulate metals in the study area were mainly controlled by source geology and provenance,as well as affected by human activity.%于2009年6～7月黄河调水调沙前、中、后期对黄河口水体悬浮颗粒物进行采样调查,采用ICP-AES测定Al、Fe、Mn、Cr、Cu、Ni、V、Zn的含量,探讨调水调沙对颗粒态重金属分布的影响,初步分析了调水调沙前、中、后期黄河口颗粒态重金属的污染状况.结果表明,调水调沙期间颗粒态重金属的浓度升高,河口区颗粒态重金属的浓度随盐度的升高而降低.以Al为校正因子归一化消除颗粒粒径影响后,重金属的分布差异变小,表明粒径是影响重金属浓度变化的重要因素.富集因子计算结果显示,黄河口Cu、Zn相对富集,且调水调沙后其污染程度加重.在影响颗粒态重金属组成的因素中,颗粒物来源占主导地位,同时受人为活动的影响.