中国某高校土壤中微塑料的丰度与特征

K. Tang, Yuxin Luo
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引用次数: 1

摘要

虽然在环境的各个领域都检测到微塑料,但很少有研究调查高等教育机构中微塑料的含量,学生和工作人员接触到微塑料可能会引起关注。本研究旨在量化和表征中国一所高等教育机构土壤中的微塑料。表层土壤样本一式三份,从均匀分布在校园教学、娱乐和居住区域的9个采样点采集。土壤样品用5mm筛网筛过,通过筛网的馏分用30%过氧化氢消化。从消化后的土壤中密度分离微塑料,并在显微镜下观察。用ATR-FTIR测定其成分。该研究显示,教学区和居民区的微塑料丰度(分别为150-700件/公斤和50-650件/公斤)高于娱乐区(0-450件/公斤),其中住宅区的平均丰度最高(516.7件/公斤)。纤维状和碎片状微塑料在土壤样品中最常见(分别为31.5%和33.3%),前者在居民区更为普遍。黑色微塑料(36.4%)和白色微塑料(29.1%)比其他颜色的微塑料多。0.5 mm的微塑料占回收微塑料总量的最大比例(64.3%),聚乙烯微塑料含量最多(35.2%)。该研究有助于更好地了解高等教育机构化合物中的微塑料污染,这可能与这些机构内的人类活动呈正相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Abundance and Characteristics of Microplastics in the Soil of a Higher Education Institution in China
While microplastics have been detected in various spheres of the environment, there are few studies examining their abundance in higher education institutions, where their exposure to students and staff could raise concern. This study aims to quantify and characterise the microplastics in the soil of a higher education institution in China. Surface soil samples were collected in triplicate from nine sampling sites distributed evenly across teaching, recreational, and residential areas on campus. The soil samples were sieved with a 5 mm screen, and the fractions passing through the sieve were digested with 30% hydrogen peroxide. Microplastics were density-separated from the digested soil and observed under the microscope. ATR-FTIR was used to determine their compositions. This study reveals a higher abundance of microplastics in teaching and residential areas (150–700 items/kg and 50–650 items/kg, respectively) as compared to recreational areas (0–450 items/kg), with the highest mean abundance (516.7 items/kg) recorded for residential areas. Fibrous and fragment microplastics (31.5% and 33.3%, respectively) were most common in the soil samples, with the former more prevalent in residential areas. There were more black microplastics (36.4%) and white microplastics (29.1%) than those of other colors. Microplastics £ 0.5 mm constituted the largest fraction (64.3%) of total microplastics recovered and polyethylene microplastics were most abundant (35.2%). This study contributes to a better understanding of microplastic pollution in the compounds of higher education institutions, which could be positively linked to the human activities within those institutions.
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