微塑料无处不在,并且在一个庞大的城市地区的土壤中增加,城 (亚利桑那州)
Kanchana Chandrakanthan1, Matthew P Fraser2, Pierre Herckes1
1School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, United States.
The Science of the total environment
|October 7, 2023
概括
微塑料在沙漠土壤中普遍存在,从2005年到2015年,它们的数量增加,大小减少. 聚乙烯是这些陆地环境中最常见的聚合物.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 地质科学是地球科学.
背景情况:
- 微塑料是普遍存在的环境污染物.
- 尽管陆地生态系统是微塑料的主要来源和沉积点,但它们的研究重视程度低于海洋环境.
- 沙漠大都市地区对微塑料污染的研究不足.
研究的目的:
- 在亚利桑那州中部和城长期生态研究 (CAP-LTER) 区域调查微塑料的空间和时间土壤度.
- 在沙漠大都市环境中分析微塑料的分布和随时间的变化.
- 为了确定索诺拉沙漠土壤中存在的微塑料类型.
主要方法:
- 使用了来自中央亚利桑那州生态调查 (ESCA) 调查 (2005年和2015年) 的土壤样本.
- 补充了一年 (2020-2021) 的微塑料沉积流量测量时间数据.
- 使用光学显微镜量化微塑料和使用微拉曼光谱学识别的聚合物类型.
主要成果:
- 在2015年的土壤样本中,微塑料无处不在和丰富 (122-1299微塑料/公斤),没有明确的空间趋势.
- 观察到每天显著的微塑料沉积 (平均178个微塑料/m2/day).
- 土壤中微塑料的丰富度增加,平均尺寸在2005年至2015年间下降. 聚乙烯是最常见的聚合物 (75%的地点).
结论:
- 沙漠土壤受到微塑料的严重污染,随着时间的推移,它们的数量越来越多.
- 尘暴可能会影响微塑料的再分配,并隐藏空间趋势.
- 聚乙烯是研究的沙漠土壤中占主导地位的微塑料聚合物,突出了潜在的来源和环境命运.
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