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微塑料在绿色基础设施中的时间和空间分布:雨园

Meghana Parameswarappa Jayalakshmamma¹, Viravid Na Nagara¹, Ashish Borgaonkar²

¹Center for Natural Resources, Department of Civil and Environmental Engineering, New Jersey Institute of Technology, 323 MLK Blvd., Newark, NJ, 07102, USA.

|June 12, 2024

概括

雨园有效地捕获雨水中的微塑料 (MP),商业和高密度住宅区的度更高. 议员在入口附近积累,并随着深度的增加而减少,在土壤中发现的较小颗粒更深.

科学领域:

环境科学环境科学
水质管理水质管理
城市生态城市生态学

背景情况:

像雨园这样的绿色基础设施 (GI) 缓解了城市洪水和水污染.
雨水花园对微塑料 (MPs) 的保留能力,特别是较小的颗粒 (<125μm),尚未得到充分理解.
了解雨园中的MP分布对于评估它们在城市环境中的有效性至关重要.

研究的目的:

为了研究微塑料 (MP) 在新泽西州纽瓦克三个已建立的雨园的空间和时间分布.
确定土地使用,土壤深度和入口距离等因素如何影响MP保留.
描述雨园沉积物中保留的MP类型和大小.

主要方法:

从不同土地用途 (住宅,商业) 的雨园收集的沉积物样本,在不同深度和水平距离.
使用富里埃变换红外光谱 (FTIR) 和拉曼显微镜量化和表征微塑料.
分析了9个月的MP度 (2022年5月 - 2023年2月).

主要成果:

平均MP度因地点而异: 469 ± 89.8 pkg−1 (第1地点),604 ± 91.4 pkg−1 (第2地点),997 ± 64.3 pkg−1 (第3地点).
聚烯是主要的聚合物,其次是尼龙和聚乙烯.
较大的MP (250微米-5毫米) 集中在前5厘米,而较小的MP (1-250微米) 发现更深 (≥10厘米);15厘米以下没有检测到MP.
雨水入口附近的MP度最高,并横向下降.
在9个月的研究期间,在所有地点观察到MP度的显著增加.

结论:

雨水花园显示出从雨水中保留微塑料的能力,其有效性受到土地使用和颗粒大小的影响.
国会议员在雨水花园中的空间分层,较大的粒子保留在上层,较小的粒子迁移到更深处.
结果为优化GI设计和管理策略提供了关键数据,以控制城市流域中的微塑料污染.

关键词:

积累积累是一种积累.生物维护生物维护微塑料是一种微塑料.雨花园雨花园雨花园风暴水的风暴水是什么意思

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