In order to measure the contamination of dredged and beach sediments and the applicability of sediment quality guidelines in a wet subtropical region of southern Brazil, the areas surrounding both the Paranaguá and Babitonga estuaries were studied, including their harbour zones and adjacent beaches. Investigation of the sampled sediments comprised optical and electron microscopy, energy-dispersive X-ray spectroscopy, inductively coupled plasma mass spectrometry, and physicochemical and toxicological analyses. Additionally, data provided by the harbours administrations on dredged volumes, sedimentology, and coastal dynamics were compared. It was determined that the studied sediments, especially the ones from both tidal deltas, have similar characteristics, including physical and chemical parameters. It was also confirmed that tidal deltas are depositional areas with low potential to accumulate pollutants. Therefore, the current disposal of this scarce sandy material during dredging might not be beneficial, considering the significant sand removal amount from the coastal depositional system.

为了测量疏浚和海滩沉积物的污染以及沉积物质量准则在巴西南部潮湿的亚热带地区的适用性，研究了巴拉那瓜和巴比通加河口周围的地区，包括它们的港口区和相邻的海滩。对采样沉积物的研究包括光学和电子显微镜、能量色散 X 射线光谱、电感耦合等离子体质谱以及物理化学和毒理学分析。此外，还比较了港口管理部门提供的有关疏浚量、沉积学和海岸动态的数据。确定研究的沉积物，尤其是来自两个潮汐三角洲的沉积物，具有相似的特征，包括物理和化学参数。潮汐三角洲也是污染物积累潜力低的沉积区。因此，考虑到从沿海沉积系统中去除大量的沙子，目前在疏浚过程中处理这种稀有的沙子材料可能没有好处。