Copper-based aquatic algaecides have been widely used in the management of aquatic macrophyte and harmful algal blooms for decades due to their effectiveness and low cost. However, repeated treatment of freshwater lakes results in the accumulation of copper in the sediment, which may adversely affect the ecosystem of the lakes through toxicity to benthic invertebrates and other organisms. Consequently, copper-based aquatic herbicides and algaecides have been frequently subjected to regulations aimed at preventing further ecological deterioration in treated waterbodies. Many states in the US are taking or considering taking an approach that limits or prohibits copper treatment in waterbodies. Freshwater lakes with extensive historical copper treatments typically have significantly higher concentrations of copper in the sediment than untreated lakes. However, the correlation between the extent of the treatments and level of copper accumulation in the sediment has not been quantitatively characterized. In the present study, between 2006 and 2017, copper concentrations were measured in the sediment from selected lakes in New York State with different histories of copper-based aquatic algaecide treatment. Analysis of these data confirmed findings from earlier studies conducted by New York State that lakes with histories of copper treatment have significantly higher copper concentrations in the sediment. It also demonstrated that sediment copper concentrations were significantly higher in the sublittoral zone than the littoral zone in treated lakes. Moreover, a positive correlation was detected between sediment copper concentrations and the total number of treatments with copper-based aquatic algaecide for both littoral and sublittoral zones (p-value = 7.94 × 10⁻⁸ and 3.1 × 10⁻¹³, respectively). This relationship can be used as a screening tool for regulatory agencies to identify lakes with sediment copper levels possibly higher than the toxicity threshold for aquatic life. Consequently, additional ecological risk assessment may be required before allowing future treatment with copper-based aquatic algaecides. Integr Environ Assess Manag 2024;00:1–12. © 2024 SETAC

中文翻译：

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根据铜基水生除藻剂处理历史预测淡水湖泊沉积物质量分类

几十年来，铜基水生除藻剂因其有效性和低成本而被广泛用于水生植物和有害藻华的管理。然而，淡水湖泊的反复处理会导致沉积物中铜的积累，这可能会对底栖无脊椎动物和其他生物产生毒性，从而对湖泊生态系统产生不利影响。因此，铜基水生除草剂和除藻剂经常受到旨在防止处理水体进一步生态恶化的监管。美国许多州正在采取或考虑采取限制或禁止水体中铜处理的方法。历史上经过广泛铜处理的淡水湖沉积物中的铜浓度通常比未经处理的湖泊高得多。然而，处理程度与沉积物中铜积累水平之间的相关性尚未得到定量表征。在本研究中，2006 年至 2017 年间，测量了纽约州选定湖泊沉积物中的铜浓度，这些湖泊具有不同的铜基水生除藻剂处理历史。对这些数据的分析证实了纽约州早期研究的结果，即有铜处理历史的湖泊沉积物中的铜浓度明显较高。它还表明，在处理过的湖泊中，亚滨海带沉积物铜浓度明显高于滨海带。此外，在滨海和亚滨海区域沉积物铜浓度与铜基水生除藻剂处理总数之间检测到正相关（p值分别= 7.94 × 10 ^-8和3.1 × 10 ^-13）。这种关系可以用作监管机构的筛选工具，以识别沉积物铜含量可能高于水生生物毒性阈值的湖泊。因此，在允许未来使用铜基水生除藻剂进行处理之前，可能需要进行额外的生态风险评估。整体环境评估管理2024；00:1–12。 © 2024 SETAC 版权所有