Santos Isaac R, Silva-Filho Emmanoel V, Schaefer Carlos E G R, Albuquerque-Filho Manoel R, Campos Lúcia S
Departamento de Geoquímica, Universidade Federal Fluminense, 24020-007 Niterói-RJ, Brazil.
Mar Pollut Bull. 2005 Feb;50(2):185-94. doi: 10.1016/j.marpolbul.2004.10.009.
This paper investigates the natural and anthropogenic processes controlling sediment chemistry in Admiralty Bay, King George Island, Antarctica, emphasizing the area affected by the Brazilian Antarctic Station Comandante Ferraz (Ferraz). Total and bioavailable concentrations of sixteen elements were determined in 32 sediment and 14 soils samples. Factor analysis allowed us to distinguish three groups of samples: (1) Ferraz sediments, with higher content of total trace metals and organic matter; (2) control sediments, with intermediate characteristics; (3) Ferraz soils, with higher bioavailability of most metals due to its oxidizing condition and low organic matter content. Major elements such as Fe, Al, Ca and Ti presented similar levels in all three groups. Enrichment factor calculations showed that paints, sewage and petroleum contamination enhanced metal concentrations in Ferraz surface sediments as follows: B, Mo, and Pb (>90%); V and Zn (70-80%); Ni, Cu, Mg, and Mn (30-40%). Despite evidence of contamination in these sediments, the low bioavailability, probably caused by iron-sulfide, indicates small environmental risks.
本文研究了控制南极乔治王岛阿德默勒尔蒂湾沉积物化学性质的自然和人为过程，重点关注受巴西南极费拉兹司令站（费拉兹站）影响的区域。测定了32个沉积物样本和14个土壤样本中16种元素的总量和生物可利用浓度。因子分析使我们能够区分出三组样本：（1）费拉兹站沉积物，其总痕量金属和有机质含量较高；（2）对照沉积物，具有中等特征；（3）费拉兹站土壤，由于其氧化条件和低有机质含量，大多数金属的生物可利用性较高。铁、铝、钙和钛等主要元素在所有三组中的含量相似。富集因子计算表明，涂料、污水和石油污染使费拉兹站表层沉积物中的金属浓度增加如下：硼、钼和铅（>90%）；钒和锌（70-80%）；镍、铜、镁和锰（30-40%）。尽管这些沉积物中有污染迹象，但可能由硫化铁导致的低生物可利用性表明环境风险较小。
