Institut National des Sciences et Technologies de la Mer, Salammbô, Tunis, Tunisia.
Universidade do Estado do Rio de Janeiro - UERJ, Faculdade de Geologia, Av. São Francisco Xavier, 524, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil.
Environ Pollut. 2015 Dec;207:226-37. doi: 10.1016/j.envpol.2015.09.033. Epub 2015 Sep 25.
The authors investigated sediment quality in Bizerte Lagoon (Tunisia) focusing on geochemical characteristics, metal sediment fractionation and elutriate toxicity assessment. Nickel, Cu, Zn, Pb, Cr and Cd partitioning in sediments was studied; accumulation and bioavailability were elucidated using enrichment factors, sequential extractions, redox potential, acid volatile sulfide and biotest procedures in toxicity evaluation. Results revealed an accumulation for Pb and Zn, reaching 99 and 460 mg kg(-1) respectively. In addition, the acid volatile sulfide values were high in both eastern and western lagoon areas, thus affecting metal availability. Mean enrichment factor values for Pb and Zn were 4.8 and 4.9, respectively, with these elements as the main contributors to the lagoon's moderate enrichment level. Toxicity levels were influenced by accumulation of Zn in different surface sediment areas. Core sediments were investigated in areas with the highest metal concentrations; metal fractionation and biotest confirmed that Zn contributes to sediment toxicity.
作者研究了突尼斯比塞大泻湖的沉积物质量，重点关注地球化学特征、金属沉积物分馏和洗脱毒性评估。研究了沉积物中镍、铜、锌、铅、铬和镉的分配情况；利用富集因子、顺序提取、氧化还原电位、酸可挥发性硫化物和生物测试程序，在毒性评估中阐明了积累和生物利用度。结果表明，铅和锌的积累量达到了 99 和 460mg/kg。此外，东部和西部泻湖地区的酸可挥发性硫化物值都很高，从而影响了金属的可用性。铅和锌的平均富集因子值分别为 4.8 和 4.9，表明这些元素是导致泻湖中度富集的主要因素。毒性水平受到不同表层沉积物中锌积累的影响。在金属浓度最高的区域调查了岩芯沉积物；金属分馏和生物测试证实，锌是导致沉积物毒性的原因。
