Aggravating Pollution of Emerging Aryl Organophosphate Esters in Urban Estuarine Sediments of South China,Environmental Science & Technology

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Aggravating Pollution of Emerging Aryl Organophosphate Esters in Urban Estuarine Sediments of South China
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-17 , DOI: 10.1021/acs.est.4c01646
Jia-Yong Lao ₁ , Guangling Huang _{2,

3} , Rongben Wu ₁ , Wenzhao Liang ₄ , Shaopeng Xu ₁ , Qiong Luo ₁ , Kai Zhang _{3,

5} , Le Jing ₁ , Linjie Jin ₁ , Yuefei Ruan _{1,

3,

6} , Kenneth M Y Leung _{1,

3} , Paul K S Lam _{1,

3,

7}

Affiliation

Emerging aryl organophosphate esters (aryl-OPEs) have been employed as substitutes for organohalogen flame retardants in recent years; however, their environmental occurrence and associated impacts in urban estuarine sediments have not been adequately investigated, impeding regulatory decision-making. Herein, field-based investigations and modeling based on surface sediment and sediment core analysis were employed to uncover the historical pollution and current environmental impacts of aryl-OPEs in the Pearl River Estuary, South China. Our results revealed a substantial increase in aryl-OPE emission, particularly emerging aryl-OPEs, through sediment transport to the estuary since the 2000s. The emerging aryl-OPEs comprised 83% of the total annual input in the past decade, with an average annual input of 155,000 g. Additionally, the emerging-to-traditional aryl-OPE concentration ratios increased with decreasing distance from the shore, peaking in the highly urbanized riverine outlets. These findings indicate that inventories of emerging aryl-OPEs are likely increasing in estuarine sediments and their emissions are surpassing those of traditional aryl-OPEs. Our risk-based priority screening approach indicates that some emerging aryl-OPEs, particularly bisphenol A bis(diphenyl phosphate), can pose a higher environmental risk than traditional aryl-OPEs in estuarine sediments. Overall, our study highlights the importance of recognizing the environmental impacts of emerging aryl-OPEs.

中文翻译：

华南城市河口沉积物中新出现的芳基有机磷酸酯污染加剧

近年来新兴的芳基有机磷酸酯（aryl-OPEs）已被用作有机卤素阻燃剂的替代品；然而，它们的环境发生情况和对城市河口沉积物的相关影响尚未得到充分调查，阻碍了监管决策。本文采用基于表层沉积物和沉积物核心分析的实地调查和建模来揭示华南珠江口芳基OPEs的历史污染和当前环境影响。我们的结果显示，自 2000 年代以来，通过沉积物输送到河口，芳基-OPE 排放量大幅增加，特别是新兴的芳基-OPE。新兴芳基OPE占过去十年年投入总量的83%，年均投入量为15.5万克。此外，新兴芳基-OPE与传统芳基-OPE的浓度比随着距海岸距离的减小而增加，在高度城市化的河流出海口达到峰值。这些发现表明，河口沉积物中新兴芳基OPE的库存可能会增加，并且其排放量将超过传统芳基OPE。我们基于风险的优先筛选方法表明，一些新兴的芳基OPE，特别是双酚A双（磷酸二苯酯），可能比河口沉积物中的传统芳基OPE造成更高的环境风险。总的来说，我们的研究强调了认识新兴芳基OPE对环境影响的重要性。

更新日期：2024-07-17

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