Otero X L, Vidal-Torrado P, Calvo de Anta R M, Macías F
Departamento de Edafoloxía e Química Agrícola, Escola Politécnica Superior de Lugo, Universidade de Santiago de Compostela, 27002 Lugo, Spain.
Environ Pollut. 2005 Jul;136(1):119-34. doi: 10.1016/j.envpol.2004.11.026.
The trace elements present at highest concentrations were Cr and Zn, which probably originated from the dumping of effluent from a tanning factory. High proportions of these two elements were associated with the residual fraction. Biodeposits and sediments showed high concentrations of Cd and Pb in the reactive fraction, with a high proportion of the concentration in the reactive fraction being associated with carbonates. Nickel showed a higher degree of pyritization than the previous elements, although most of the Ni was associated with the residual and reactive fractions. Arsenic, Hg and Cu showed high degrees of pyritization, particularly below a depth of 5 cm. The results demonstrate that those elements with a high degree of pyritization may be released into the water through oxidation of the metal sulphides that they form when in suspension in oxic sea water, with the subsequent risk of increased bioavailability to benthic fauna.
浓度最高的微量元素是铬和锌，它们可能源自一家制革厂废水的排放。这两种元素的很大一部分与残留部分相关。生物沉积物和沉积物中的反应性部分镉和铅浓度很高，反应性部分中很大比例的浓度与碳酸盐有关。镍的黄铁矿化程度比前几种元素更高，尽管大部分镍与残留部分和反应性部分相关。砷、汞和铜表现出很高的黄铁矿化程度，尤其是在5厘米深度以下。结果表明，那些具有高度黄铁矿化的元素可能会通过它们在含氧海水中悬浮时形成的金属硫化物的氧化而释放到水中，随后存在底栖动物生物可利用性增加的风险。
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