Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland--a case study of the Yellow River Delta Natural Reserve.

摘要: Coastal and estuarine areas are often polluted by heavy metals that result from industrial production agricultural activities. In this study, we investigated the concentration trait vertical pattern of trace elements, such as As, Cd, Ni, Zn, Pb, Cu, Cr, relationship between those elements soil properties in coastal wetlands using 28 profiles were surveyed across Diaokouhe Nature Reserve (DKHNR). The goal study is to investigate profile distribution characteristics different wetland types their variations with depth assess metal pollution indices identify sources multivariate analysis sediment quality guidelines. Principal component analysis, cluster level applied evaluate contamination conditions due degradation. findings indicated decreased depth, while Cd increases depth. As concentrations reed swamps Suaeda heteroptera surface layers slightly higher than other land use types. All six metals, i.e., strongly associated PC1 (positive loading) could reflect contribution natural geological into sediments. PC2 highly represent anthropogenic pollution. Most exhibited significant positive correlations total concentrations; however, no observed them salt organic carbon. Soil carbon a linear Zn first layer (0-20 cm); second (20-40 third (40-60 cm). only negative correlation (P < 0.05), layers. lower geoaccumulation index values (I (geo) values), which averaged less 0 three layers, finding indicates soils have remained unpolluted these metals. mean Class I criteria. degradation restoration suggestions also been provided way restore reserved flow path Yellow River. results element would be helpful providing scientific directions world.