Among the anthropogenic sources releasing metallic species into the marine environment, the galvanic anode cathodic protection system (GACP) is widely used to protect submerged metallic structures from corrosion. Galvanic anodes are an alloy of metals of which the main component is aluminum or zinc. Very few studies were performed to study their potential biological effects. We investigated the chronic toxicity of an aluminum-based galvanic anode on the Pacific oyster, Crassostrea gigas. Oysters were exposed for 84 days to three concentrations of aluminum (50, 100 and 300 µg L⁻¹) obtained with an electrochemical experimental device simulating the dissolution of a galvanic anode. At different exposure times, we studied a battery of biomarkers of the immune system, reproductive parameters and the metabolic state of the oysters. Results demonstrated a sensitivity of oysters at the highest concentration and some biological effects were observed especially for the malondialdehyde content in the digestive gland after 84 days of exposure. In addition to these biomarkers, the bioaccumulation of the different metals composing the anode was measured in oysters’ tissues. Bivalves bioaccumulated more zinc than aluminum, even if aluminium was present in greater concentrations during exposures. Moreover, exposure time did not influence the bioaccumulation of aluminum in contrast to zinc.

在将金属物质释放到海洋环境中的人为来源中，阳极阴极保护系统 (GACP) 被广泛用于保护水下金属结构免受腐蚀。电镀阳极是一种金属合金，其主要成分是铝或锌。很少有研究来研究它们的潜在生物学效应。我们研究了铝基电阳极对太平洋牡蛎 (Crassostrea gigas) 的慢性毒性。牡蛎在三种浓度的铝（50、100 和 300 µg L ^-1) 用模拟原电池溶解的电化学实验装置获得。在不同的暴露时间，我们研究了一组免疫系统的生物标志物、生殖参数和牡蛎的代谢状态。结果表明牡蛎在最高浓度下具有敏感性，并观察到一些生物效应，特别是在接触 84 天后消化腺中的丙二醛含量。除了这些生物标志物外，还测量了构成阳极的不同金属在牡蛎组织中的生物积累。双壳贝类比铝生物积累更多的锌，即使铝在暴露期间以更高的浓度存在。此外，与锌相比，暴露时间不影响铝的生物累积。