Amino accelerators and antioxidants in sediments from the Dong Nai River System, Vietnam: Distribution and influential factors

  • Environ Res. 2023 Jun 15:227:115712. doi: 10.1016/j.envres.2023.115712.
Ruihe Jin  1 ,  Yue Li  2 ,  Yoshiki Saito  3 ,  Zhanghua Wang  4 ,  Thi Kim Oanh Ta  5 ,  Van Lap Nguyen  5 ,  Jing Yang  6 ,  Min Liu  6 ,  Yan Wu  7
Affiliations
  • 1. Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China.
  • 2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China. Electronic address: [email protected].
  • 3. Estuary Research Center, Shimane University, Nishikawatsu-cho 1060, Matsue, 690-8504, Japan; Geological Survey of Japan, AIST. Central 7, Higashi 1-1-1, Tsukuba, 305-8567, Japan.
  • 4. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China.
  • 5. HCMC Institute of Resources Geography, Tay Nguyen Institute of Scientific Research, VAST, Ho Chi Minh City, Viet Nam.
  • 6. Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China; Key Laboratory of Spatial-temporal Big Data Analysis and Application of Natural Resources in Megacities, Ministry of Natural Resources, Shanghai, 200241, China.
  • 7. Key Laboratory of Geographic Information Science (Ministry of Education), School of Geographic Sciences, East China Normal University, Shanghai 200241, China; Key Laboratory of Spatial-temporal Big Data Analysis and Application of Natural Resources in Megacities, Ministry of Natural Resources, Shanghai, 200241, China. Electronic address: [email protected].
PMID: 36933640 DOI: 10.1016/j.envres.2023.115712
Abstract

Amino accelerators and Antioxidants (AAL/Os) have become a suite of contaminants of emerging concern recently due to the accumulating evidence for their environmental occurrence and associated toxic potential. Nevertheless, data on sedimentary deposition of AAL/Os has remained scarce, particularly for regions beyond the North America. In the present study, we elucidated spatial distribution of fifteen AAL/Os and five AAO transformation products (AAOTPs) in seventy-seven sediments from the Dong Nai River System (DNRS), Vietnam. Total concentrations of AAL/Os (∑AAL/Os) ranged from 0.377 to 51.4 ng/g (median: 5.01 ng/g). 1,3-Diphenylguanidine and 4,4'-bis(1,1-dimethylbenzyl) diphenylamine were the two most prevalent congeners, both with detection frequencies >80%. Additionally, AAOTPs were quantifiable in 79% of the DNRS sediments with a median ∑AAOTPs at 2.19 ng/g, dominated by N, N'-diphenylbenzidine and 2-nitrodiphenylamine. Higher sediment-associated levels of AAL/Os and AAOTPs were spotted in downstream and the primary tributary of the DNRS compared to the upstream, implying their cumulative sedimentation towards the estuarine region. The distribution patterns of AAL/Os and AAOTPs across individual transects also demonstrated the influence of human activities (e.g., urbanization and agriculture), hydrodynamics, and decontamination by mangrove reserves. Meanwhile, characteristics of sediments, i.e., total organic carbon (TOC) content and grain sizes, exhibited significant correlations with the burdens of these compounds, indicating their preferential partitioning into the fine and TOC-rich matter. This research sheds light on environmental behavior of AAL/Os and AAOTPs beneath Asian aquatic system, and highlights the need for further evaluation of their impacts on the wildlife and public health.

Keywords
Amino accelerators and antioxidants; Driving factors; Spatial distribution; The Dong Nai River System; Transformation products.
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