Glyphosate in waters and soils from genetically modified canola cultivation in Parkes, NSW, Australia

Paper


Nahar, Kamrun, Niven, Robert K., Pearson, Stuart, Badek, Kate, Riesen, Hans and Rahman, A. F. Mokhlesur. 2013. "Glyphosate in waters and soils from genetically modified canola cultivation in Parkes, NSW, Australia." SEAg 2013: Innovative Agricultural Technologies for a Sustainable Future. Barton, Australia 22 - 25 Sep 2013 Barton, ACT, Australia.
Paper/Presentation Title

Glyphosate in waters and soils from genetically modified canola cultivation in Parkes, NSW, Australia

Presentation TypePaper
AuthorsNahar, Kamrun (Author), Niven, Robert K. (Author), Pearson, Stuart (Author), Badek, Kate (Author), Riesen, Hans (Author) and Rahman, A. F. Mokhlesur (Author)
Journal or Proceedings TitleProceedings of the 2013 Conference of the Australian Society for Engineering in Agriculture (SEAg 2013)
Number of Pages16
Year2013
Place of PublicationBarton, ACT, Australia
ISBN9781922107114
Web Address (URL) of Paperhttps://www.researchgate.net/publication/339069807_Glyphosate_in_Waters_and_Soils_from_Genetically_Modified_Canola_Cultivation_in_Parkes_NSW_Australia#fullTextFileContent
Conference/EventSEAg 2013: Innovative Agricultural Technologies for a Sustainable Future
Event Details
SEAg 2013: Innovative Agricultural Technologies for a Sustainable Future
Event Date
22 to end of 25 Sep 2013
Event Location
Barton, Australia
Abstract

Investigations were conducted of farmland from the Parkes region of New South Wales, Australia, cultivated with genetically modified canola, involving the determination of glyphosate (N-(phosphonomethyl)glycine) concentrations in water and soils, and its sorption. The soils are classified as loam under the USDA system (clay 13.8-15.8%, silt 39-43%, sand 41.2-47.2%). Firstly, a low-cost fluorometric method was developed for the analysis of glyphosate in waters and soils, calibrated against analytical standards and spectrophotometric and enzyme-linked immunosorbent assay (ELISA) methods. Soil and water samples were then collected using the NEPM sampling protocol into glass containers, chilled and analysed within two weeks. The samples were collected in multiple episodes, taking account of glyphosate and pesticide crop applications. The soil and water physical and chemical properties were characterised, and glyphosate levels were determined. Field concentrations of glyphosate ranged between 0.01 - 0.067 mg/L in water and 0.10 - 0.575 mg/kg in soil. The aqueous levels lie below Australian and international drinking water guidelines, but reach a Canadian freshwater guideline. Glyphosate levels varied with time of application and rainfall events. Glyphosate sorption isotherms were also constructed by batch tests on several soils, and were fitted with Freundlich and Langmuir isotherms. Desorption tests indicated 25% to 58% of soil glyphosate is extractable by 0.1M KH2PO4.

Keywordsglyphosate, water, soil, fluorometric, spectrophotometric, ELISA, sorption isotherm
ANZSRC Field of Research 2020400499. Chemical engineering not elsewhere classified
Public Notes

© 2013 Engineers Australia.

Byline AffiliationsUniversity of New South Wales
Institution of OriginUniversity of Southern Queensland
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