Microplastic contamination in the western Arctic water column: A transition from pristine to polluted

IF 8.1 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Chemosphere Pub Date : 2025-07-22 DOI:10.1016/j.chemosphere.2025.144577

Murugan Sambandam , Pravakar Mishra , Takahito Ikenoue , Ryota Nakajima , Motoyo Itoh , Kuppuswamy Dhineka , Thanamegam Kaviarasan , S.R. Marigoudar

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Abstract

The Arctic Ocean, once regarded as a pristine and untouched icy expanse, now faces an increasing threat from microplastic (MPs, <5 mm) pollution. This study presents quantitative data on MP contamination in the water column of the western Arctic Ocean. A total of 324 replicate water samples were collected using a CTD (Conductivity, Temperature, and Depth) rosette sampler from depths ranging from 9 to 297 m. The isolated MPs were analyzed using micro-Fourier Transform Infrared Spectroscopy (μ-FTIR). The average abundance of MP was 0.06 particles L⁻¹, and the Beaufort Sea station (BFS 26) recorded the highest concentration (0.22 particles L⁻¹). Blue-coloured and fibrous nature, small MPs (<500 μm) primarily composed of polyolefins were dominant. The distribution of MPs in the water column was as follows: Polar Mixed Layer (59 %), Pacific or Atlantic halocline (22 %), and the Intermediate layer of Atlantic water (19 %). This study provides valuable insights into the vertical distribution of MPs, their characteristics, and the probable sources of the influx of MPs into this region.

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北极西部水柱中的微塑料污染：从原始到污染的过渡

北冰洋，曾经被认为是一片原始的、未受影响的冰原，现在正面临着微塑料污染日益严重的威胁。本研究提供了北冰洋西部水柱中多聚氰胺污染的定量数据。使用CTD（电导率、温度和深度）玫瑰花状采样器，从9至297 m的深度共收集了324个重复水样。利用微傅里叶变换红外光谱（μ-FTIR）对分离的MPs进行分析。MP的平均丰度为0.06个粒子L−1，其中波弗特海站（BFS 26）的浓度最高，为0.22个粒子L−1。蓝色和纤维性，主要由聚烯烃组成的小MPs （<500 μm）占主导地位。MPs在水柱中的分布为：极地混合层（59%）、太平洋或大西洋盐跃层（22%）和大西洋水中间层（19%）。这项研究为MPs的垂直分布、它们的特征以及MPs涌入该地区的可能来源提供了有价值的见解。

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来源期刊

Chemosphere 环境科学-环境科学

CiteScore

15.80

自引率

8.00%

发文量

4975

审稿时长

3.4 months

期刊介绍： Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.