Abstract James WF, Bischoff JM. 2019. Aluminum:phosphorus binding ratios and internal phosphorus loading characteristics 12 years after aluminum sulfate application to Lake McCarrons, Minnesota. Lake Reserv Manage. 36:1–13. Lake McCarrons, Minnesota, an urban eutrophic system (mean depth = 7.6 m, maximum depth = 17.4 m) located in the St. Paul metropolitan area, was treated in 2004 with ∼77 g Al/m2 uniformly over depths >1.5 m to reduce internal phosphorus (P) loading. Sediment cores were collected at various depths and areas in the lake in 2016, 12 yr after the Al treatment, to examine concentrations and vertical distribution of Al, Al-bound P, the aluminum:Al-bound P (Al:P) binding ratio, and current anaerobic diffusive P flux. The Al floc became redistributed after application and varied with respect to the northwest–southeast (NW-SE) maximum fetch. Added Al was maximal in the SE area, exceeding nearly 180% of the target Al dose, and buried with up to 5 cm of sediment. In the NW, added Al was lower (14% to 34% of target Al dose) to not detected and dispersed in the upper 3 cm with little burial. Al-bound P increased with increasing added Al concentration over all stations. The molar Al:P binding ratio approached 10:1 in conjunction with lowest added Al concentrations found in the NW, suggesting P saturation and inefficient control of newly deposited redox P and corresponding diffusive P flux. Although SE areas had the greatest added Al, the molar Al:P binding ratio was > 30:1, suggesting poor binding efficiency and crystallization. This Al floc has become buried, and redox P in surface sediment now represents an important internal P load to the lake to be managed in the future.

中文翻译：

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在明尼苏达州麦卡伦湖施用硫酸铝 12 年后沉积物铝：磷结合率和内部磷负荷特征

摘要 James WF，Bischoff JM。2019. 明尼苏达州麦卡伦湖硫酸铝应用 12 年后铝：磷结合率和内部磷负载特性。湖泊保护区管理。36:1-13。明尼苏达州麦卡伦湖是位于圣保罗大都市区的城市富营养化系统（平均深度 = 7.6 m，最大深度 = 17.4 m），在 2004 年用 ~77 g Al/m2 均匀地处理 >1.5 m，以减少内部磷 (P) 负载。2016 年，在 Al 处理后 12 年，在湖中不同深度和区域收集沉积物核心，以检查 Al、Al 结合 P、Al:Al 结合 P (Al:P) 结合比的浓度和垂直分布，以及当前的厌氧扩散 P 通量。铝絮状物在应用后重新分布，并随着西北-东南 (NW-SE) 的最大提取量而变化。添加的铝在 SE 区域最大，超过了目标铝剂量的近 180%，并被高达 5 厘米的沉积物掩埋。在 NW 中，添加的铝较低（目标铝剂量的 14% 至 34%）至未被检测到并分散在上部 3 cm 中，几乎没有埋藏。在所有站点上，Al 结合 P 随着添加的 Al 浓度的增加而增加。Al:P 的摩尔结合比接近 10:1，同时在 NW 中发现的最低添加的 Al 浓度，表明 P 饱和和对新沉积的氧化还原 P 和相应的扩散 P 通量的低效控制。尽管 SE 区域添加了最大的 Al，但 Al:P 的摩尔结合比 > 30:1，表明结合效率和结晶较差。这铝絮已被掩埋，