Simultaneous XAD-2 resin extraction and high-resolution electron-capture gas chromatography of chlorine-containing herbicides in water samples

Ishibashi, Masahiro; Suzuki, Manabu

doi:10.1016/0021-9673(86)80036-x

Cited by 17 publications

(3 citation statements)

References 8 publications

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“…Two different photoproducts for Ima (P1_Ima and P2_Ima), 3 photoproducts for Pro (P1_Pro, P2_Pro and P3_Pro), while no photodegradation product was identified in Oxa solutions. Previous Oxa degradation products investigations were performed using GC-MS or electroanalytical methods (Boyd-Boland and Pawliszyn 1995;Garrigo et al 2001;Ishibashi and Suzuki 1988;Kadokami et al 1991;Kobayashi et al 1993;Liao et al 1991;Mattern et al 1991;Ying and Williams 1999). These approaches led to the identification of degradation products, whose presence was not observed through our LC-MS data.…”

Section: Photodegradation Studies Of the Selected Herbicidesmentioning

confidence: 98%

Monitoring of water quality inflow and outflow of a farm in Italian Padana plain for rice cultivation: a case study of two years

Gosetti

Robotti

Bolfi

et al. 2019

Environ Sci Pollut Res

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Rice cultivation requires a large use of pesticides and nutrients to control weeds proliferation and improve production. The water quality of four neighbouring rice fields located in the Lomellina area (Italian Padana plain) was monitored in this study along the cultivation period (before, during and after the period of planting), for two successive agricultural seasons (2015 and 2016). Two paddy fields were traditionally cultivated with wet-seeding and the other ones with dry-seeding.Eighteen sampling points were considered: 8 points for surface water, 2 points for underground water, and 8 points for porous cups with 2 different depth. In order to evaluate the goodness of Revised ManuscriptClick here to access/download;Manuscript;revised manuscript.docx Click here to view linked References the paddy field system to maintain unchanged the quality of the inflow with respect to the outflow water, three of the most used herbicides in Italian rice cultivation (imazamox, oxadiazon and profoxydim) and other physical-chemical parameters were determined, namely biological oxygen demand after 5 days, chemical oxygen demand, total suspended solids, anionic surfactants, total hardness, total amount of phosphorus, nitrogen, and potassium and heavy metal concentrations.In general, all the collected data confirmed that paddy fields did not contribute to worsen the environmental pollution. The different flooding techniques adopted in the fields did not highlight significant differences in concentrations of pesticides or metals. The pesticides reached their maximum concentration (of the magnitude order of few ng mL -1 ) in the day after the administration and in the day after the application in the adjacent field. A slight reduction of total As in grain was obtained adopting a dry period from the steam elongation up to booting. From the collected data, it was possible to identify a general water flow direction in the paddy fields from North-West to South-East: this prevailing flow direction was useful to understand not only the diffusion of the pesticides and of their degradation products in the fields, but also that of the nutrients.As concerns nutrients, it was important not to activate a recirculation of the water in the field during the first 10 days from the administration, in order to avoid loss of nitrogen in the water vents or for percolation. Moreover, the monitoring of potassium concentration allowed to avoid the use of unnecessary potassic fertilization when there was already a high amount of this element in the paddy field deriving from the irrigation. However, all the investigated water quality parameters were under the limits fixed by the European Regulation. In addition, the presence of seven unexpected compounds was identified by non-target approach in both campaigns in samples collected in the early summer period. Four of these emerging contaminants were identified as N,N-diethyl-meta-toluamide, tricyclazole, amidosulfuron and one of the imazamox photodegradation products.Although the low found concentrations of...

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Section: Photodegradation Studies Of the Selected Herbicidesmentioning

confidence: 98%

Monitoring of water quality inflow and outflow of a farm in Italian Padana plain for rice cultivation: a case study of two years

Gosetti

Robotti

Bolfi

et al. 2019

Environ Sci Pollut Res

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“…To obtain accurate analytical data at trace concentrations careful attention to procedural details is essential [9,176,[179][180][181][182][183][184][185][186][187]. Prior to use the polymeric beads must be prewet to promote complete permeation of the water into all of the pores of the polymer, and the adsorbent column must be operated so that the sample passes through these pores.…”

Section: Macroreticular Porous Polymer Adsorbentsmentioning

confidence: 99%

Sample Preparation for Chromatographic Analysis

Poole

1991

Chromatography Today

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“…Oxadiazon's major degradation products in rice are carboxylic acids, alcohols, and dealkylated derivatives [2][3][4][5][6]. The most frequently used method for its quantification is gas chromatography [7][8][9][10][11][12][13]. Determina-tion by gaschromatography is highly sensitive and selective, and sufficiently rapid for most purposes.…”

Section: Introductionmentioning

confidence: 99%

Electroanalytical Determination of Oxadiazon and Characterization of Its Base-Catalyzed Ring-Opening Products

Garrido

Lima²,

Delerue-Matos

et al. 2001

Electroanalysis

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The electrochemical behavior of the hydrolysis products of oxadiazon was studied by cyclic and square-wave voltammetry using a glassy carbon electrode. Maximum currents were obtained at pH 12.8 in an aqueous electrolyte solution containing 30 % ethanol and the current did not decrease with time showing that there was little adsorption of the reaction products on the electrode surface. The hydrolysis products of oxadiazon were identified, after isolation and purification, as 1-trimethylacetyl-2-(2,4-dichloro-5isopropoxyphenyl)-2-ethoxy-carbonylhydrazine (Oxa1) and 1-trimethylacetyl-2-(2,4-dichloro-5-isopropoxyphenyl) hydrazine (Oxa2) with redox potentials + 0.6 V and-0.1 V (vs. Ag/AgCl), respectively. Based on the electrochemical behavior of 1-trimethylacetyl-2-(2,4-dichloro-5isopropoxyphenyl) hydrazine (Oxa2) a simple electroanalytical procedure was developed for the determination of oxadiazon in commercial products used in the treatment of rice crops in Portugal that contain oxadiazon as the active ingredient. The detection limit was 1 x10-4 M, the mean content and relative standard deviation obtained for seven samples of two different commercial products by the electrochemical method were 28.4 ± 0.8 % (Ronstar) and 1.9 ± 0.2 % (Ronstar GR), and the recoveries were 100.3 ± 5.4 % and 101.1 ± 5.3 %, respectively.

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Simultaneous XAD-2 resin extraction and high-resolution electron-capture gas chromatography of chlorine-containing herbicides in water samples

Cited by 17 publications

References 8 publications

Monitoring of water quality inflow and outflow of a farm in Italian Padana plain for rice cultivation: a case study of two years

Monitoring of water quality inflow and outflow of a farm in Italian Padana plain for rice cultivation: a case study of two years

Sample Preparation for Chromatographic Analysis

Electroanalytical Determination of Oxadiazon and Characterization of Its Base-Catalyzed Ring-Opening Products

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