Detection of Glyphosate in DrinkingWater

A Fast and Direct Detection Method without Sample Pretreatment

Jafar Safaa Noori, Maria Dimaki, John Mortensen, Winnie Svensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 M, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a Gly
Metabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.
Original languageEnglish
Article numberE2961
JournalSensors
Volume18
Issue number9
Pages (from-to)2961-2969
Number of pages9
ISSN1424-8220
DOIs
Publication statusPublished - 5 Sep 2018

Keywords

  • electrochemistry
  • glyphosate
  • Pesticide
  • sensors
  • water

Cite this

Safaa Noori, Jafar ; Dimaki, Maria ; Mortensen, John ; Svensen, Winnie. / Detection of Glyphosate in DrinkingWater : A Fast and Direct Detection Method without Sample Pretreatment. In: Sensors. 2018 ; Vol. 18, No. 9. pp. 2961-2969.
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abstract = "Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 M, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a GlyMetabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.",
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Detection of Glyphosate in DrinkingWater : A Fast and Direct Detection Method without Sample Pretreatment. / Safaa Noori, Jafar; Dimaki, Maria; Mortensen, John; Svensen, Winnie.

In: Sensors, Vol. 18, No. 9, E2961, 05.09.2018, p. 2961-2969.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Detection of Glyphosate in DrinkingWater

T2 - A Fast and Direct Detection Method without Sample Pretreatment

AU - Safaa Noori, Jafar

AU - Dimaki, Maria

AU - Mortensen, John

AU - Svensen, Winnie

PY - 2018/9/5

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N2 - Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 M, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a GlyMetabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.

AB - Glyphosate (Gly) is one of the most problematic pesticides that repeatedly appears in drinking water. Continuous on-site detection of Gly in water supplies can provide an early warning in incidents of contamination, before the pesticide reaches the drinking water. Here, we report the first direct detection of Gly in tap water with electrochemical sensing. Gold working electrodes were used to detect the pesticide in spiked tap water without any supporting electrolyte, sample pretreatment or electrode modifications. Amperometric measurements were used to quantify Gly to a limit of detection of 2 M, which is below the regulation limit of permitted contamination of drinking water in the United States. The quantification of Gly was linearly proportional with the measured signal. The selectivity of this method was evaluated by applying the same technique on a GlyMetabolite, AMPA, and on another pesticide, omethoate, with a chemical structure similar to Gly. The testing revealed no interfering electrochemical activity at the potential range used for Gly detection. The simple detection of Gly presented in this work may lead to direct on-site monitoring of Gly contamination at drinking water sources.

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