Files and links (2)
Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
A diffusive gradients in thin-films (DGT) methodology for in situ measurement of imazamox and imazapyr herbicide residues
Talanta (Oxford), Vol.295, pp.1-11
01/12/2025
PMID: 40398039
Metrics
1 Record Views
Abstract
Imidazolinones (IMIs) are a group of commonly used chiral herbicides. However, because of their persistence and mobility, IMI herbicides pose a toxicity risk to non-target aquatic organisms and sensitive crop varieties. Conventional grab sampling and the subsequent solvent extraction of IMI herbicides from environmental samples do not provide information on their bioavailability. The current study focuses on development of an in situ technique based on the diffusive gradients in thin-films (DGT), to measure labile imazamox (IMX) and imazapyr (IMPy) herbicide residues in soil and water systems. Eleven different materials were tested to select an efficient binding phase for the DGT. Of them, SepraZT-WAX and bioactive carbon (BAC) showed high adsorption and elution efficiency when incorporated into a polyacrylamide binding gel after extensive testing of the gel incorporation and elution procedures. The SepraZT-WAX binding gels yielded a stable elution efficiency (∼85%) at different preloaded herbicide concentrations (0.01–5.0 μM) where the elution efficiency increased with increased preloaded herbicide concentration. This highlights the need to investigate a concentration-dependent elution factor when testing novel DGTs. Compared to SepraZT-WAX DGT, BAC-DGT showed a higher binding capacity and faster adsorption rate, and its performance was independent of the solution pH (4.0–9.1), electrical conductivity (1–50 mS cm-1), and bicarbonate (0–1800 mg HCO3- L-1) and sulfate (0–600 mg SO42- L-1) concentrations for both herbicides. This study demonstrates the reliability and accuracy of this DGT device for measuring IMI herbicides and other anionic contaminants frequently detected in water and soil systems.
Details
- Title
- A diffusive gradients in thin-films (DGT) methodology for in situ measurement of imazamox and imazapyr herbicide residues
- Creators
- Vijay Kumar Aralappanavar - University of South AustraliaBinoy Sarkar - University of South AustraliaCasey L. Doolette - University of South AustraliaMichael Rose - Cooperative Research Centre for High Performance Soils (Australia)Leigh Donnellan - University of South AustraliaEuan Smith - University of South AustraliaSean Mason - Agronomy Solutions (South Australia)Peter Hoffmann - University of South AustraliaEnzo Lombi - University of South Australia
- Publication Details
- Talanta (Oxford), Vol.295, pp.1-11
- Publisher
- Elsevier B.V
- Grant note
- Authors acknowledge the South Australian Grain Industry Trust for co-funding this work (SAGIT Project No. USA121). This work has been supported by the Cooperative Research Centre for High Performance Soils whose activities are funded by the Australian Government’s Cooperative Research Centre Program (Project No. 4.S.006). The authors acknowledge Bioplatforms Australia, and the State and Federal Governments, which co-fund the NCRIS-enabled Mass Spectrometry and Proteomics Facility at the University of South Australia.
- Identifiers
- 991013285421602368
- Copyright
- © 2025 The Authors
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article