Compound specific isotope analysis of organophosphorus pesticides

Wu, Langping; Yao, Jun; Trebše, Polonca; Zhang, Ning; Richnow, Hans H.

doi:10.1016/j.chemosphere.2014.04.037

Cited by 38 publications

(25 citation statements)

References 30 publications

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“…Laboratory-derived carbon enrichment factors of pesticides are subject to uncertainty ranges typically between ±0.1 ‰ and ±1.0 ‰ (Elsayed et al, 2014;Meyer and Elsner, 2013;Wu et al, 2014). In order to assess the uncertainty in Rayleigh equation estimates, we considered an uncertainty range of ±0.5 ‰ for ε C around the best-fit value (i.e.…”

Section: Degradation Assessment With the Rayleigh Equation And The Modelmentioning

confidence: 99%

“…In the context of diffuse agricultural pollution, CSIA has mainly been used to distinguish natural from anthropogenic nitrate sources and discern denitrification (Divers et al, 2014;Johannsen et al, 2008;Kellman and HillaireMarcel, 2003;Voss et al, 2006;Wexler et al, 2014). Although CSIA may provide evidence of pesticide degradation (Fenner et al, 2013), CSIA data of pesticides remain restricted to the analysis of isotope fractionation under laboratory conditions (Hartenbach et al, 2008;Meyer and Elsner, 2013;Meyer et al, 2009;Penning et al, 2010;Reinnicke et al, 2011;Wu et al, 2014) and grab samples of groundwater and streamwater (Milosevic et al, 2013;Schreglmann et al, 2013). Degradation of chloroacetanilide herbicides and associated isotope fractionation have been recently studied in lab-scale wetlands (Elsayed et al, 2014), but CSIA of herbicides has not yet been applied on catchment scale to evaluate in situ degradation of pesticides.…”

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confidence: 99%

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Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Lutz

Velde

Elsayed

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Compound-specific stable isotope analysis (CSIA) has proven beneficial in the characterization of contaminant degradation in groundwater, but it has never been used to assess pesticide transformation on catchment scale. This study presents concentration and carbon CSIA data of the herbicides S-metolachlor and acetochlor from three locations (plot, drain, and catchment outlets) in a 47 ha agricultural catchment (Bas-Rhin, France). Herbicide concentrations at the catchment outlet were highest (62 µg L −1 ) in response to an intense rainfall event following herbicide application. Increasing δ 13 C values of S-metolachlor and acetochlor by more than 2 ‰ during the study period indicated herbicide degradation. To assist the interpretation of these data, discharge, concentrations, and δ 13 C values of S-metolachlor were modelled with a conceptual mathematical model using the transport formulation by travel-time distributions. Testing of different model setups supported the assumption that degradation half-lives (DT50) increase with increasing soil depth, which can be straightforwardly implemented in conceptual models using travel-time distributions. Moreover, model calibration yielded an estimate of a field-integrated isotopic enrichment factor as opposed to laboratory-based assessments of enrichment factors in closed systems. Thirdly, the Rayleigh equation commonly applied in groundwater studies was tested by our model for its potential to quantify degradation on catchment scale. It provided conservative estimates on the extent of degradation as occurred in stream samples. However, largely exceeding the simulated degradation within the entire catchment, these estimates were not representative of overall degradation on catchment scale. The conceptual modelling approach thus enabled us to upscale sample-based CSIA information on degradation to the catchment scale. Overall, this study demonstrates the benefit of combining monitoring and conceptual modelling of concentration and CSIA data and advocates the use of traveltime distributions for assessing pesticide fate and transport on catchment scale.

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Section: Degradation Assessment With the Rayleigh Equation And The Modelmentioning

confidence: 99%

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confidence: 99%

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Lutz

Velde

Elsayed

et al. 2017

Hydrol. Earth Syst. Sci.

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“…With the development of analytical techniques that can separate mixtures of organic pesticides and precisely measure the stable isotope ratios of individual elements, it is possible to determine a source of origin of the synthesized product . Thus, forensic isotope ratio analysis can be applied to the unique carbon and nitrogen stable isotopic ratios that are preserved in organophosphorus pesticides such as malathion, methamidophos, dichlorvos, omethoate and dimethoate manufactured in different countries, where these ratios depend on the origin of the materials, the synthetic route, and the chemical reaction conditions . In recent forensic cases evidence collected from food contaminants was matched to a crime scene sample through nitrogen isotope analysis of the malathion used at the crime scene and carbon isotope analysis of the frozen food used as a agrochemical product …”

Section: Introductionmentioning

confidence: 99%

“…10 Thus, forensic isotope ratio analysis can be applied to the unique carbon and nitrogen stable isotopic ratios that are preserved in organophosphorus pesticides such as malathion, methamidophos, dichlorvos, omethoate and dimethoate manufactured in different countries, where these ratios depend on the origin of the materials, the synthetic route, and the chemical reaction conditions. [10][11][12][13] In recent forensic cases evidence collected from food contaminants was matched to a crime scene sample through nitrogen isotope analysis of the malathion used at the crime scene and carbon isotope analysis of the frozen food used as a agrochemical product. 12 Isotope fractionation of stable isotopes in the natural world occurs by ecological actions related to the supply source of the organism as well as the biological distribution and circulation of carbon and nitrogen.…”

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confidence: 99%

Tracing the source of methomyl using stable isotope analysis

Song

Gwak

Jung

et al. 2018

Rapid Comm Mass Spectrometry

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“…GC to detect organophosphorus pesticides in Heshouwu s a m ples f ro m th e Wu d a ng m ou n ta i n a rea. As organophosphorus pesticides have been the most widely used pesticides in China, and have previously been demonstrated to contaminate water and food (11)(12)(13)(14)(15)(16)(17), the present study aimed to detect the presence of 10 organophosphorus pesticides using GC, according to the criteria of the Chinese Pharmacopoeia (9). The results suggested that there were no organophosphorus pesticide residues in the samples (Table V; Fig.…”

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confidence: 99%

Quality evaluation of Heshouwu, a Taoist medicine in Wudang, China

Cao

Wang

et al. 2016

Experimental and Therapeutic Medicine

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Thunb., which is known as Heshouwu in China, is a Taoist medicine sourced from the Wudang mountain area. At present, the quality of the Heshouwu sourced from this region is unknown. The present study aimed to evaluate the quality of wild Heshouwu collected from the Wudang mountain area, particularly the 2,3,5,4'-tetrahydroxystilbene-2-O-β-D-glucoside (TSG) and combined anthraquinone (CAQ) content, compared with that of commercially available Heshouwu. Furthermore, the potential quantities of organic pesticide residues were determined. High performance liquid chromatography with a diode array detector was used to quantify TSG and CAQ content, whereas gas chromatography (GC), performed using a temperature gradient, was used to detect the presence of organochlorine, pyrethroid and organophosphorus pesticides. The average TSG content present in the wild Heshouwu from the Wudang mountain area and in the commercially available Heshouwu was 2.39 and 1.10%, respectively. In addition, the average content of CAQ in these was 1.41 and 3.46%, respectively. GC did not detect residues of organic pesticides in the wild Heshouwu, thus this plant met the criterion of the Chinese Pharmacopeia (2010 edition). The results of the present study indicated that wild Heshouwu from the Wudang mountain area may be suitable for use as a Chinese medicine across China.

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Compound specific isotope analysis of organophosphorus pesticides

Cited by 38 publications

References 30 publications

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Pesticide fate on catchment scale: conceptual modelling of stream CSIA data

Tracing the source of methomyl using stable isotope analysis

Quality evaluation of Heshouwu, a Taoist medicine in Wudang, China

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