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<p>The intertidal zone of mangroves has a significant impact on the ecological environment by serving as a crucial habitat for a wide range of organisms. When assessing heavy metal contamination in sediments within this zone, it is essential to establish a regional geochemical baseline that accounts for natural variations. In this study, regional geochemical baselines of heavy metals were established based on core sediment samples collected from Dongzhai Harbor in November 2015. Linear regression analysis was employed to examine the correlations between heavy metals and potential normalized elements. Subsequently, the sediment quality and intensity of pollutant input in the sediments of a mangrove intertidal zone were evaluated with enrichment factor (EF) and excessive influx of heavy metals. The EF values for Cr, Cd, Pb, Zn, and Ni in the study area were all below 1.5, indicating minimal levels of contamination; however, minor Cu contamination was observed in the high tidal flat area due to potential terrestrial inputs. These findings suggest that the overall environmental quality about heavy metals was good within the intertidal zone of mangroves. Moreover, as for the excess fluxes of heavy metals in intertidal sediments, there was consistency between influence and intervention of human activities on sedimentary environment during the selected period when examining variation trends.</p>

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Regional geochemical baseline establishment, heavy metal pollution assessment and investigation of its variation in response to human activities in mangrove intertidal sediments in Hainan, China

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Fang Lu,
  • Yong Chen,
  • Wenquan Liu,
  • Jichao Yang

摘要

The intertidal zone of mangroves has a significant impact on the ecological environment by serving as a crucial habitat for a wide range of organisms. When assessing heavy metal contamination in sediments within this zone, it is essential to establish a regional geochemical baseline that accounts for natural variations. In this study, regional geochemical baselines of heavy metals were established based on core sediment samples collected from Dongzhai Harbor in November 2015. Linear regression analysis was employed to examine the correlations between heavy metals and potential normalized elements. Subsequently, the sediment quality and intensity of pollutant input in the sediments of a mangrove intertidal zone were evaluated with enrichment factor (EF) and excessive influx of heavy metals. The EF values for Cr, Cd, Pb, Zn, and Ni in the study area were all below 1.5, indicating minimal levels of contamination; however, minor Cu contamination was observed in the high tidal flat area due to potential terrestrial inputs. These findings suggest that the overall environmental quality about heavy metals was good within the intertidal zone of mangroves. Moreover, as for the excess fluxes of heavy metals in intertidal sediments, there was consistency between influence and intervention of human activities on sedimentary environment during the selected period when examining variation trends.