January 10, 2020

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Leah MacKinnon and Neal Durant Co-authored Paper on Surfactant-Enhanced Alkaline Hydrolysis of Organophosphorus Pesticide DNAPL in the Journal Environmental Science Pollution Research

Leah MacKinnon, P.Eng. (Ontario) and Neal Durant, Ph.D. (Washington, D.C.) coauthored a paper entitled "Solubility and reactivity of surfactant-enhanced alkaline hydrolysis of organophosphorus pesticide DNAPL" that was published in the journal Environmental Science Pollution Research (ESPR) on December 16, 2019.

Leah and Neal's coauthors were Jens Muff, Lars Frausing Bennedsen, Kirsten Rügge, Morten Bondgaard, and Kurt D. Pennell.     

Leah is a Principal Engineer with more than 20 years of professional experience in the United States, Canada, and Europe focusing on remediation of groundwater containing recalcitrant and emerging compounds using innovative in situ technologies.

Neal is a Senior Principal Consultant based in Washington, D.C. with more than 28 years of experience investigating, remediating, and managing complex contaminated sites.

ESPR serves the international community in all areas of Environmental Science and related subjects with emphasis on chemical compounds. It reports from a broad interdisciplinary outlook. Apart from the strictly scientific contributions as research articles (short and full papers) and reviews, ESPR publishes news & views from research and technology, legislation and regulation, hardware and software, education, literature, institutions, organizations, conferences.


The study presented in this paper evaluated the effectiveness of surfactants in enhancing mass removal of organophosphorus pesticides (OPPs) from soil under highly alkaline conditions and potential for enhancing in situ alkaline hydrolysis for treatment of OPPs, particularly parathion (EP3) and methyl parathion (MP3). In control and surfactant experiments, hydrolysis products EP2 acid, MP2 acid, and PNP were formed in non-stoichiometric amounts indicating instability of these compounds. MP3 and malathion were found to have faster hydrolysis rates than EP3 under the conditions studied. All surfactants evaluated increased solubility of OPPs under alkaline conditions with four nonionic alcohol ethoxylate products providing the greater affect over the polyglucosides, sulfonate, and propionate surfactants evaluated. The alcohol ethoxylates were shown to provide substantial mass removal of OPPs from soil. Hydrolysis rates were typically slower in the presence of surfactant, despite the relatively higher aqueous concentrations of OPPs; this was likely due to micellar solubilization of the OPPs which were therefore less accessible for hydrolysis. The results of this study support the use of surfactants for contaminant mass removal from soil, particularly under alkaline conditions, and may have implications for use of some surfactants in combination with other technologies for treatment of OPPs.

More Information

Learn more about the article: https://link.springer.com/article/10.1007/s11356-019-07152-0
Learn more about the journal: https://link.springer.com/journal/11356
For consultation regarding Surfactant-Enhanced Alkaline Hydrolysis of Organophosphorus Pesticide DNAPL, contact Leah at This email address is being protected from spambots. You need JavaScript enabled to view it. or  Neal Durant at This email address is being protected from spambots. You need JavaScript enabled to view it..
Learn more about Leah at: https://www.geosyntec.com/people/leah-mackinnon
Learn more about Neal at: https://www.geosyntec.com/people/neal-durant