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, α = 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 Chem 2020;39:2475–2484. © 2020 SETAC

中文翻译：

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评估由于雨水重金属污染沉积物而造成的生物量积累。

在评估沉积物修复工作在减少生物影响方面的长期有效性时，评估雨水排放造成的沉积物再污染非常重要。蛤（Macoma nasuta）中重金属锌，镍，铜，镉，汞和铅和类金属砷的生物积累。）在美国加利福尼亚州帕莱塔克里克（Paleta Creek）于2015年至2016年以及2016年至2017年的雨季期间输入雨水前后的表面沉积物中进行了研究。将生物蓄积与通过薄膜中扩散梯度测量的总体沉积物浓度和孔隙水浓度进行了比较。设备。尽管暴风雨后的总沉积物浓度保持不变或增加，但与暴风雨季节之前相比，暴风雨季节之后收集的样品中的生物群落积累和孔隙水浓度明显降低。显然，这是生物利用度低的雨水污染物沉积的结果。所有被测污染物的生物蓄积与孔隙水浓度呈显着正相关（p <0.1，α= 0.1），并且与总体沉积物浓度的相关性很弱或没有相关性。总之，如果不进行生物利用度评估，就不应假定观察到的因雨水引起的大量沉积物再污染直接导致了更大的生物群落积累。2020年《环境毒理学》； 39：2475–2484。©2020 SETAC