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Assessment of Envi-Carb as a passive sampler binding phase for acid herbicides without pH adjustment


Seen, A and Bizeau, O and Sadler, L and Jordan, T and Nichols, D, Assessment of Envi-Carb as a passive sampler binding phase for acid herbicides without pH adjustment, Chemosphere, 103, (5) pp. 306-312. ISSN 0045-6535 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier Ltd.

DOI: doi:10.1016/j.chemosphere.2013.11.075


The graphitised carbon solid phase extraction (SPE) sorbent Envi-Carb has been used to fabricate glass fibre filter- Envi-Carb "sandwich" disks for use as a passive sampler for acid herbicides. Passive sampler uptake of a suite of herbicides, including the phenoxyacetic acid herbicides 4-chloro-o-tolyloxyacetic acid (MCPA), 2,4-dichlorophenoxyacetic acid (2,4-D) and 3,6-dichloro-2-methoxybenzoic acid (Dicamba), was achieved without pH adjustment, demonstrating for the first time a suitable binding phase for passive sampling of acid herbicides at neutral pH. Passive sampling experiments with Duck River (Tasmania, Australia) water spiked at 0.5 μg L−1 herbicide concentration over a 7 d deployment period showed that sampling rates in Duck River water decreased for seven out of eight herbicides, and in the cases of 3,6-dichloro-2-pyridinecarboxylic acid (Clopyralid) and Dicamba no accumulation of the herbicides occurred in the Envi-Carb over the deployment period. Sampling rates for 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid (Picloram), 2,4-D and MCPA decreased to approximately 30% of the sampling rates in ultrapure water, whilst sampling rates for 2-(4,6-dimethylpyrimidin-2-ylcarbamoylsulfamoyl) benzoic acid, methyl ester (Sulfometuron-methyl) and 3,5,6-Trichloro-2-pyridinyloxyacetic acid (Triclopyr) were approximately 60% of the ultrapure water sampling rate. For methyl N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-D-alaninate (Metalaxyl-M) there was little variation in sampling rate between passive sampling experiments in ultrapure water and Duck River water. SPE experiments undertaken with Envi-Carb disks using ultrapure water and filtered and unfiltered Duck River water showed that not only is adsorption onto particulate matter in Duck River water responsible for a reduction in herbicide sampling rate, but interactions of herbicides with dissolved or colloidal matter (matter able to pass through a 0.2 μm membrane filter) also reduces the herbicide sampling rate.

Item Details

Item Type:Refereed Article
Keywords:passive sampling, herbicides, phenoxyacid herbicides, Envi-Carb.
Research Division:Earth Sciences
Research Group:Atmospheric sciences
Research Field:Atmospheric composition, chemistry and processes
Objective Division:Environmental Management
Objective Group:Fresh, ground and surface water systems and management
Objective Field:Measurement and assessment of freshwater quality (incl. physical and chemical conditions of water)
UTAS Author:Seen, A (Associate Professor Andrew Seen)
UTAS Author:Bizeau, O (Miss Oceane Bizeau)
UTAS Author:Sadler, L (Mr Sadler)
UTAS Author:Jordan, T (Dr Timothy Jordan)
UTAS Author:Nichols, D (Dr David Nichols)
ID Code:91485
Year Published:2014
Web of Science® Times Cited:6
Deposited By:Central Science Laboratory
Deposited On:2014-05-20
Last Modified:2017-11-02

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