Mercury dynamics in the mangrove-influenced estuary of the Parnaíba Delta, Brazil

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

Chemosphere Pub Date : 2025-03-04 DOI:10.1016/j.chemosphere.2025.144262

Andreia C.M. Rodrigues , Natalia Torres-Rodriguez , Jingjing Yuan , Aurélie Dufour , Luiz Drude de Lacerda , Lars-Eric Heimbürger-Boavida

{"title":"Mercury dynamics in the mangrove-influenced estuary of the Parnaíba Delta, Brazil","authors":"Andreia C.M. Rodrigues , Natalia Torres-Rodriguez , Jingjing Yuan , Aurélie Dufour , Luiz Drude de Lacerda , Lars-Eric Heimbürger-Boavida","doi":"10.1016/j.chemosphere.2025.144262","DOIUrl":null,"url":null,"abstract":"<div><div>The Parnaíba River Delta (PRD), located in northeastern Brazil, is an ecologically crucial estuarine system little impacted by anthropogenic activities. This study aimed to assess mercury (Hg) contamination levels in the water and sediments and their link to changes in the hydrographic parameters across the delta to evaluate spatial distribution patterns and Hg speciation. Water and surface sediment samples were collected from 12 stations throughout the PRD. Results showed that total Hg (tHg) levels ranged from 4.27 to 39.01 pM, with the majority associated with particles (pHg: 16.03 ± 9.95 pM). Dissolved methylmercury concentrations (dMeHg: 0.043 ± 0.015 pM) were low and represented a minor fraction of Hg. Seawater intrusion during flood tide was associated with lower levels of all Hg species. Particulate Hg was sequestered and stored in the fine-grained mangrove sediments (0.14–28.2 ng g<sup>−1</sup> dry weight). Our study provides baseline data on Hg cycling in the PRD, highlighting its pristine condition and function as a buffer between terrestrial and marine environments. Pristine mangrove systems are effectively sequestering carbon and mercury and should, therefore, be considered as blue carbon and blue mercury ecosystems for mitigation strategies.</div></div>","PeriodicalId":276,"journal":{"name":"Chemosphere","volume":"376 ","pages":"Article 144262"},"PeriodicalIF":8.1000,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemosphere","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0045653525002048","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

The Parnaíba River Delta (PRD), located in northeastern Brazil, is an ecologically crucial estuarine system little impacted by anthropogenic activities. This study aimed to assess mercury (Hg) contamination levels in the water and sediments and their link to changes in the hydrographic parameters across the delta to evaluate spatial distribution patterns and Hg speciation. Water and surface sediment samples were collected from 12 stations throughout the PRD. Results showed that total Hg (tHg) levels ranged from 4.27 to 39.01 pM, with the majority associated with particles (pHg: 16.03 ± 9.95 pM). Dissolved methylmercury concentrations (dMeHg: 0.043 ± 0.015 pM) were low and represented a minor fraction of Hg. Seawater intrusion during flood tide was associated with lower levels of all Hg species. Particulate Hg was sequestered and stored in the fine-grained mangrove sediments (0.14–28.2 ng g⁻¹ dry weight). Our study provides baseline data on Hg cycling in the PRD, highlighting its pristine condition and function as a buffer between terrestrial and marine environments. Pristine mangrove systems are effectively sequestering carbon and mercury and should, therefore, be considered as blue carbon and blue mercury ecosystems for mitigation strategies.

Abstract Image

查看原文本刊更多论文

巴西Parnaíba三角洲受红树林影响河口的汞动力学

Parnaíba河三角洲（PRD）位于巴西东北部，是一个受人为活动影响较小的生态关键河口系统。本研究旨在评估水和沉积物中的汞污染水平及其与整个三角洲水文参数变化的联系，以评估汞的空间分布模式和形态。在珠江三角洲的12个监测站收集了水和地表沉积物样本。结果表明：大气中总汞（tHg）含量在4.27 ~ 39.01 pM之间，以颗粒物为主（pHg: 16.03±9.95 pM）；溶解甲基汞浓度（dMeHg: 0.043±0.015 pM）较低，仅占汞的一小部分，涨潮时海水入侵导致所有汞含量降低。颗粒汞在细粒红树林沉积物中被隔离和储存（干重0.14 ~ 28.2 ng g−1）。我们的研究提供了珠江三角洲汞循环的基线数据，强调了其原始状态和作为陆地和海洋环境之间缓冲的功能。原始红树林系统有效地隔离了碳和汞，因此应被视为缓解战略的蓝碳和蓝汞生态系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.