Abstract Child AW, Moore BC. 2019. Total phosphorus analyses: is the convenience of automated inline-UV digestion robust enough for freshwater nutrient monitoring? Lake Reserve Manage. 35:140–147 Phosphorus (P) is an essential and often growth-limiting nutrient in aquatic ecosystems. Excessive P in aquatic ecosystems can result in accelerated eutrophication and is a prime cause of “impaired” water quality listing under the Clean Water Act. Total phosphorus (TP) is a commonly used metric for predicting productivity and assessing nutrient enrichment in aquatic ecosystems. Accurate and precise TP data are essential for aquatic resource managers and scientists. Inline-ultraviolet (inline-UV) and persulfate digestions are both approved methods for estimating TP within water samples, and literature on their relative digestion efficiencies is available. However, the available literature to date has only evaluated relatively high TP concentrations, >90 µg P/L, considerably higher than critical trophic concentrations for natural lakes and streams. We compared inline-UV digestion with the more common autoclave persulfate digestion, analyzing TP from 32 freshwater sites in northern Idaho and eastern Washington. Sites were chosen to represent common ranges of TP (5 to 350 µg P/L) found in surface waters throughout the world. Both digestions performed adequately on third-party reference materials used for laboratory accreditation requirements. The linear model comparing logarithmic transformations of TP estimates from both digestion methods were correlated (p < 0.001, R2 = 0.8110), and suggested inline-UV digestion may not accurately estimate low-level TP concentrations in natural waters. Our results indicate that inline-UV digestion results are overall not comparable to autoclave digestion (absolute mean difference 16 µg/L or 22%, p < 0.001); lake managers should be aware that TP method selection can significantly alter data interpretation for nutrient monitoring plans.

中文翻译：

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总磷分析：自动化在线紫外线消解的便利性是否足以用于淡水营养监测？

摘要儿童 AW，摩尔 BC。2019. 总磷分析：自动在线紫外线消解的便利性是否足以用于淡水营养监测？湖泊保护区管理。35:140–147 磷 (P) 是水生生态系统中必不可少且通常会限制生长的营养素。水生生态系统中过量的 P 会导致加速富营养化，并且是《清洁水法》所列水质“受损”的主要原因。总磷 (TP) 是预测生产力和评估水生生态系统营养丰富度的常用指标。准确和精确的 TP 数据对于水生资源管理者和科学家来说至关重要。内联紫外线 (inline-UV) 和过硫酸盐消解都是经批准的用于估算水样中 TP 的方法，并且有关于它们的相对消解效率的文献。然而，迄今为止可用的文献仅评估了相对较高的 TP 浓度，>90 µg P/L，远高于天然湖泊和溪流的临界营养浓度。我们将在线紫外线消解与更常见的高压釜过硫酸盐消解进行了比较，分析了来自爱达荷州北部和华盛顿东部 32 个淡水地点的总磷。选择的地点代表世界各地地表水中发现的常见总磷范围（5 至 350 µg P/L）。两种消解都对用于实验室认证要求的第三方参考材料进行了充分的分析。比较来自两种消化方法的 TP 估计值的对数变换的线性模型是相关的（p < 0.001，R2 = 0.8110），并且建议的在线紫外线消化可能无法准确估计天然水中的低水平 TP 浓度。我们的结果表明，在线紫外消解结果总体上与高压灭菌器消解不具有可比性（绝对平均差异 16 µg/L 或 22%，p < 0.001）；湖泊管理者应该意识到 TP 方法的选择可以显着改变营养监测计划的数据解释。