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Assessing Biota Accumulation Due to Contamination of Sediments by Storm Water Heavy Metals

机译：由于雨水重金属污染沉积物而评估Biota积累

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Evaluating sediment recontamination due to storm water discharges is important when evaluating the long-term effectiveness of sediment remediation efforts at reducing biological impacts. The bioaccumulation of the heavy metals zinc, nickel, copper, cadmium, mercury, and lead and the metalloid arsenic in a clam (Macoma nasuta) was studied in surficial sediments before and after storm water inputs from Paleta Creek, California, USA, during wet seasons in 2015 to 2016 and 2016 to 2017. The bioaccumulation was compared with bulk sediment concentrations and porewater concentrations measured by diffusion gradient in thin film devices. Significant reductions in biota accumulation and porewater concentrations were observed in samples collected after storm seasons compared with before storm seasons despite bulk sediment concentrations remaining the same or increasing. This was apparently the result of the deposition of storm water contaminants in low bioavailable forms. The bioaccumulation of all the measured contaminants showed a positive significant correlation with porewater concentrations (p 0.1, alpha = 0.1) and weak or no correlations with bulk sediment concentration. In conclusion, observed bulk sediment recontamination due to storm water should not be assumed to lead directly to greater biota accumulation without bioavailability assessment.Environ Toxicol Chem2020;00:1-10. (c) 2020 SETAC
机译：评估由于雨水排放引起的沉积物再污染在评估沉积物修复在减少生物撞击时的长期有效性时非常重要。在Paleta Creek，Caleta Carek，美国在潮湿的情况下，研究了蛤蜊沉积物中的重金属锌，镍，铜，镉，汞和汞和铅和铅砷的生物累积和金属砷，在潮湿的情况下，在潮湿2015年至2016年至2016年至2016年至2017年季节。将生物累积与薄膜装置中扩散梯度测量的散装沉积物浓度和孔水浓度进行了比较。在暴风季比较后，在暴风季收集的样品中观察到Biota积累和孔水浓度的显着降低，尽管散装沉积物浓度仍然相同或增加，但是在风暴季节。这显然是在低生物可利用形式中沉积雨水污染物的结果。所有测量的污染物的生物累计显示与孔水浓度（P <0.1，α= 0.1）和与散装沉积物浓度的弱或无相关性显示出正显着的相关性。总之，不应假设观察到由于雨水引起的散装沉积物再污染，直接导致没有生物利用度评估的更大的生物群积累.Environoxicol Chem2020202020; 00：1-10。 （c）2020 Setac

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