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<p>Reservoirs, as regulated components of global water systems with diverse hydrological regimes, have emerged as major sinks for polycyclic aromatic hydrocarbons (PAHs), threatening aquatic ecosystems via sediment accumulation. However, the influence of hydrological characteristics on PAH distribution remains uncertain. This study addressed this gap through the first comprehensive analysis of 21 PAHs in sediments from 15 representative reservoirs across the Wujiang, Pearl, and Qiantangjiang river basins in southern China. Sampling during dry and wet seasons was combined with gas chromatography–mass spectrometry analysis. Total PAH contents ranged from 110 to 1,900 ng/g, with spatial patterns of Wujiang river (WJR,710 ± 330 ng/g) &gt; Pearl river (PR, 460 ± 370 ng/g) &gt; Qiantangjiang river (QTJR, 400 ± 170 ng/g), linked to catchment industrialization and hydraulic retention times (HRT). Temporally, PAH accumulation was significantly higher in the dry season (<i>P</i> &lt; 0.001), attributed to reduced dilution and enhanced sedimentation. Multivariate analysis showed that prolonged HRT, aged reservoir, and elevated organic matter promoted PAH transformation. A multiple linear regression model (r<sup>2</sup> = 0.75, <i>P</i> &lt; 0.001) integrating GDP, HRT, reservoir age (RA), TOC, and TN provides a robust framework for predicting PAH distribution, enabling proactive water quality management. Findings emphasize the need to integrate hydrological, sedimentary, and socioeconomic factors in reservoir pollution assessment for sustainable water resource management.</p>

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Anthropogenic and hydrology impact on accumulation of polycyclic aromatic hydrocarbons in sediments from different regulation of reservoirs

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Li Xiaoying,
  • Wang Fushun,
  • Li Tong,
  • Chen Xueping,
  • Qin Yong,
  • Chu Yongsheng,
  • Zhang Zi-Feng,
  • Ma Jing

摘要

Reservoirs, as regulated components of global water systems with diverse hydrological regimes, have emerged as major sinks for polycyclic aromatic hydrocarbons (PAHs), threatening aquatic ecosystems via sediment accumulation. However, the influence of hydrological characteristics on PAH distribution remains uncertain. This study addressed this gap through the first comprehensive analysis of 21 PAHs in sediments from 15 representative reservoirs across the Wujiang, Pearl, and Qiantangjiang river basins in southern China. Sampling during dry and wet seasons was combined with gas chromatography–mass spectrometry analysis. Total PAH contents ranged from 110 to 1,900 ng/g, with spatial patterns of Wujiang river (WJR,710 ± 330 ng/g) > Pearl river (PR, 460 ± 370 ng/g) > Qiantangjiang river (QTJR, 400 ± 170 ng/g), linked to catchment industrialization and hydraulic retention times (HRT). Temporally, PAH accumulation was significantly higher in the dry season (P < 0.001), attributed to reduced dilution and enhanced sedimentation. Multivariate analysis showed that prolonged HRT, aged reservoir, and elevated organic matter promoted PAH transformation. A multiple linear regression model (r2 = 0.75, P < 0.001) integrating GDP, HRT, reservoir age (RA), TOC, and TN provides a robust framework for predicting PAH distribution, enabling proactive water quality management. Findings emphasize the need to integrate hydrological, sedimentary, and socioeconomic factors in reservoir pollution assessment for sustainable water resource management.