Fractionation behaviors of Cu, Zn, and S-O isotopes in groundwater contaminated with petroleum and treated by oxidation

Duk Min Kim, Woong Lim Lim, Dae Gyu Im, Jung Woo Hwang, Soonyoung Yu, Seong Taek Yun, Jeong Hee Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Fractionation behaviors of Cu and Zn isotopes have been increasingly studied at the field scale, but those in various redox conditions of groundwater contaminated with petroleum and treated by oxidation have not been assessed. In this study, δ65Cu and δ66Zn as well as δ34SSO4 and Δδ18OSO4-H2O were assessed in wells undergoing contamination by total petroleum hydrocarbons (TPH) and oxidation using H2O2 in 2021 and 2022. High δ34SSO4 and relevant parameters (e.g., dissolved sulfide and HCO3-) indicated the occurrence of sulfate reduction. The plot of δ65Cu versus δ34SSO4 effectively indicated precipitation of Cu sulfides and their reoxidation at oxidation wells. Although the plot of δ66Zn versus δ34SSO4 could also indicate reoxidation of Zn sulfides, the Zn isotopic fingerprint of sulfide precipitation may have been masked by fractionation by sorption. The advantage of using δ65Cu in the redox reactions resulted from the wider range of δ65Cu owing to the redox behavior of Cu. The plot combining isotopic fractionations of Cu and S can assist in assessing sulfide precipitation and oxidative treatment in TPH-contaminated groundwater.

Original languageEnglish
Article number131901
JournalJournal of hazardous materials
Volume458
DOIs
Publication statusPublished - 2023 Sept 15

Bibliographical note

Funding Information:
This research was partly supported by the Korea Environmental Industry and Technology Institute (KEITI) through a project (Integrated environmental forensic approaches to trace sources and pathways of subsurface contaminants) funded by the Korea Ministry of Environment (MOE) (2021002440003). This research was also partly supported by the Development of Source Identification and Apportionment Methods for Toxic Substances in Marine Environments Program of the Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries (KIMST-20220534). The authors gratefully acknowledge the contributions of Ms. Hye-Lim Kwon at Sangji University in conducting pretreatments and analyses. Special thanks go to anonymous reviewers for providing constructive comments that helped to improve the manuscript.

Funding Information:
This research was partly supported by the Korea Environmental Industry and Technology Institute ( KEITI ) through a project (Integrated environmental forensic approaches to trace sources and pathways of subsurface contaminants) funded by the Korea Ministry of Environment ( MOE ) ( 2021002440003 ). This research was also partly supported by the Development of Source Identification and Apportionment Methods for Toxic Substances in Marine Environments Program of the Korea Institute of Marine Science & Technology Promotion ( KIMST ) funded by the Ministry of Oceans and Fisheries ( KIMST-20220534 ). The authors gratefully acknowledge the contributions of Ms. Hye-Lim Kwon at Sangji University in conducting pretreatments and analyses. Special thanks go to anonymous reviewers for providing constructive comments that helped to improve the manuscript.

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Oxidative treatment
  • Sulfate reduction
  • Sulfide oxidation
  • Sulfide precipitation
  • TPH

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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