Cited by 69Mercury impact and mitigation studiesHeavy metals in environmentEnvironmental and Analytical Chemistry Studies

Effects of incorporating differently-treated rice straw on phytoavailability of methylmercury in soil

Shu, Rui, Dang, Fei, Zhong, Huan·2016·Chemosphere

Abstract

Differently-treated crops straw is being widely used to fertilize soil, while the potential impacts of straw amendment on the biogeochemistry and phytoavailability of mercury in contaminated soils are largely unknown. In the present study, differently-treated rice straw (dry straw, composted straw, straw biochar, and straw ash) was incorporated into mercury-contaminated soil at an environment relevant level (1/100, w/w), and mercury speciation, methylmercury (MeHg) phytoavailability (using ammonium thiosulfate extraction method, validated elsewhere) and bioaccumulation (in Indian mustard Brassica junceas) were quantified. Our results indicated that incorporating straw biochar or composted straw into soil would decrease phytoavailable MeHg levels, possibly due to the strong binding of MeHg with particulate organic matter in amended straw ('MeHg immobilization effect'). Consequently, MeHg accumulation in aboveground tissue of Indian mustard harvested from straw biochar-amended soil decreased by 20% compared to the control. Differently, incorporation of dry straw resulted in elevated MeHg levels in soil ('Mercury methylation effect'). Decomposition of amended dry straw in soil would evidently increase DOC levels (averagely 40%-195% higher than the control), which may subsequently mobilize MeHg in the soil ('MeHg mobilization effect'). Accordingly, incorporation of dry straw led to increased phytoavailable MeHg levels in the soil and doubled MeHg accumulation in Indian mustard. Our results provided the first evidence that incorporating differently-treated rice straw into soil could have diverse effects on mercury biogeochemistry and phytoavailability, which should be taken into account in risk assessment or soil remediation.

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Crossref · 10.1016/j.chemosphere.2015.11.037

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Authors
Shu, R., Dang, F., & Zhong, H.
Affiliations
  • State Key Laboratory of Pollution Control and Resource Reuse (CN)
  • Chinese Academy of Sciences (CN)
Corresponding author
Zhong, Huan
Venue
Chemosphere
Publisher
Elsevier BV
Published
2016-02
Volume
145
Pages
457-463
ISSN
0045-6535 (ISSN-L)
OpenAlex
W2192414260
Cited by
68
References
61
Citations by year
2025: 6 · 2024: 6 · 2023: 13 · 2022: 8 · 2021: 11 · 2020: 8 · 2019: 8 · 2018: 4 · 2017: 3 · 2016: 1
FWCI
1.54
Type
journal article
Language
en
Open access
closed
Locations
  • Chemosphere (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Natural Science Foundation of Jiangsu Province (BK2012312)
  • National Natural Science Foundation of China (41273087)
  • Ministry of Education of the People's Republic of China (20120091120014)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Mercury impact and mitigation studies
  • Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
  • Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
Keywords
methylmercury, phytoavailability, rice straw, straw biochar, straw ash, mercury-contaminated soil, Brassica juncea, bioaccumulation, mercury speciation, mercury methylation, dissolved organic carbon, particulate organic matter, soil remediation, straw amendment
MeSH terms
Agriculture, Charcoal, Environmental Monitoring, Methylmercury Compounds, Mustard Plant, Oryza, Soil Pollutants, Thiosulfates

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