Duke University Wetland Center, Nicholas School of the Environment, Durham, NC, 27708, USA.
Ambio. 2018 Jan;47(Suppl 1):124-133. doi: 10.1007/s13280-017-0981-z.
Particulate phosphorus (PP) is often the largest component of the total phosphorus (P) load in stormwater. Fine-resolution measurement of particle sizes allows us to investigate the mechanisms behind the removal of PP in stormwater wetlands, since the diameter of particles influences the settling velocity and the amount of sorbed P on a particle. In this paper, we present a novel method to estimate PP, where we measure and count individual particles in stormwater and use the total surface area as a proxy for PP. Our results show a strong relationship between total particle surface area and PP, which we use to put forth a simple mechanistic model of PP removal via gravitational settling of individual mineral particles, based on a continuous particle size distribution. This information can help improve the design of stormwater Best management practices to reduce PP loading in both urban and agricultural watersheds.
颗粒态磷（PP）通常是雨水总磷（P）负荷的最大组成部分。对颗粒大小进行精细分辨率测量可以帮助我们研究雨水湿地中去除 PP 的机制，因为颗粒的直径会影响沉淀速度和颗粒上吸附的 P 量。在本文中，我们提出了一种估计 PP 的新方法，即测量和计数雨水中的单个颗粒，并将总表面积用作 PP 的替代物。我们的结果表明，总颗粒表面积与 PP 之间存在很强的关系，我们利用这一关系提出了一个简单的机制模型，用于通过单个矿物颗粒的重力沉降去除 PP，该模型基于连续的颗粒尺寸分布。这些信息可以帮助改进城市和农业流域中减少 PP 负荷的雨水最佳管理实践的设计。
