Extraction of organophosphorus pesticides from water samples on bakerbond spe octadecyl cartridges at the ng/l level

Borburgh, H. J.; Hammers, W.E.

doi:10.1080/02772249209357802

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…However, up to 10% recovery variability was accepted for this analytical procedure. Recoveries obtained by on-line SPE provide equivalent results as compared to off-line techniques using either cartridges (19,20) or disks (21). These analytical conditions were found suitable to carry out stability studies because losses of the analytes should only be originated by degradation of such compounds during the storage conditions.…”

Section: Resultsmentioning

confidence: 99%

“…The problem of analyzing this compound relies more in its low UV absorption (<205 nm) than to the presence of two isomers, and it can be expected that when analyzing river waters or at a lower concentration, a higher error in the quantification may be expected. UV spectra of (A) the coeluting peaks fenitrothion (11) and azinphos-ethyl (12), (B) fenthion (14) and parathion-ethyl (15), and (C) temephos (19) and chlorpyrifos (20).…”

Section: Resultsmentioning

confidence: 99%

“…Another compound giving problems was temephos, due to gradient elution of matrix interfering compounds at high acetonitrile percentage which interfere with the analyte. 20 mg/L 7 h (water) (24) 243 0.20 a nf = information not found.…”

Section: Resultsmentioning

confidence: 99%

“…Formation of Transformation Products. Most papers concerning the stability of OP pesticides stored either direcdy in water (3,5,26) or on Cie disks (11,12) or cartridges (19,20) use techniques where the TPs of OP pesticides cannot be identified. Contrarily, the method used in this study is capable of measuring the pesticide compound along with its hydrolysis products.…”

Section: Resultsmentioning

confidence: 99%

“…Breakthrough Volumes. The breakthrough of all the studied pesticides was carried out by percolating 20,40,60,100,150,200, and 300 mL of groundwater through Ci8 precolumns in such a way that the amount injected was always 100 ng. Breakthrough of the analyte was calculated according to Pichón and Hennion (18).…”

Section: Introductionmentioning

confidence: 99%

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Stability of organophosphorus pesticides on disposable solid-phase extraction precolumns

Lacorte¹,

Ehresmann²,

Barceló³

1995

Environ. Sci. Technol.

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The stability of 19 organophosphorus (OP) pesticides was performed using precolumns from the Prospekt (automated on-line solid-phase extraction system) filled with CI S. Several different storage conditions were tested, which included storage at 4 O C , at -20 "C, and a combination of two conditions where precolumns were stored at 4 "C for 1.5 months and held at room temperature until analysis (0.5 and 1 month). Complete recovery was observed in precolumns kept in a t -20 "C for 8 months except for mevinphos, dichlorvos, and phosmet, which had recoveries from 22 to 58%. Degradation also occurred for these same OP pesticides when precolumns were stored a t 4 "C for 2 months and at room temperature for 1 month, with losses varying from 21 to 78% and from 41 to 61%, respectively. Complete degradation of fenamiphos and fonofos occurred in precolumns stored at 4 "C and at room temperature. The stability of the pesticides in each storing treatment is related to the hydrolytic processes, to Koc, and to their solubility in water. * Corresponding author fax: 34-3204 59 04.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stability of organophosphorus pesticides on disposable solid-phase extraction precolumns

Lacorte¹,

Ehresmann²,

Barceló³

1995

Environ. Sci. Technol.

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Organophosphorus Pesticides in Water and Food, Analysis of

Lacorte

Barceló

2000

Encyclopedia of Analytical Chemistry

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The purpose of this article is to provide an overview of the main characteristics of organophosphorus pesticides (OPPs), such as their physicochemical characteristics, sources, fate and distribution in the environment. It covers regulatory compliance from the Commission of the European Communities (CEC) and the United States National Pesticide Survey (USNPS), regarding the maximum permissible levels of the most toxic and persistent OPPs and their transformation products (TPs) in water. This article also describes the analytical methods currently used to monitor pesticides and their degradation products in water and food matrices. A major part concerns sample preparation techniques and includes traditional liquid–liquid extraction (LLE) and novel techniques based in automated solid‐phase extraction (SPE), either on‐line or off‐line. New sorbent materials, their applications and the parameters involved in the extraction are described. Chromatographic methods used for their determination are discussed in detail. Much emphasis has been given to gas chromatography (GC) and liquid chromatography (LC) coupled to mass spectrometry (MS) as a confirmation technique and mass spectral information on several pesticides has been included. The final section is devoted to method validation, with the aim of providing a basis and a framework of information for quality assurance (QA) and interlaboratory calibration studies.

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Solid phase extraction of organophosphorus, triazine, and triazole‐derived pesticides from water samples. A critical study

Báez

Rodrı́guez

Lastra

et al. 1997

J. High Resol. Chromatogr.

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SummaryA critical study using C18 SPE columns for the determination of organophosphorus, triazine, and triazole-derived pesticides, napropamide, and amitraz is presented. The type of sorbent, sorbent mass, flow rate in the extraction process, sample concentration of the different compounds, sample volume, pH, and ionic strength were evaluated. Special emphasis was placed on the evaporation step of eluates prior to GC determinations and on prefiltration of sample waters. Pesticide recovery is linear over a wide range of concentrations for most of compounds under study. Under general extraction conditions losses can be expected for amitraz, prometryn, prometon, dimethoate, penconazole, and propiconazole. At 100 ng L-' , enhanced responses are produced for mevinphos, simazine, malathion, triadimefon, methidathion, and phosmet, which can be attributed to matrix effects. At basic pH, recovery of prometon, prometryn, and penconazole are improved. Low flow rates and high ionic strength enhance the recovery of prometon and prometryn. For phosmet, the influence of sample volume was established. Likewise, the influence of sorbent quantity was established for phosmet and dimethoate. Losses during the evaporation step were observed for mevinphos, dimethoate (1 50%), penconazole, propiconazole, and prometon (30%). Prefiltration of sample waters did not cause significant variations in the whole process of extraction. Impurities arising from the sorbent materials were not detected.

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Extraction of organophosphorus pesticides from water samples on bakerbond spe octadecyl cartridges at the ng/l level

Cited by 10 publications

References 10 publications

Stability of organophosphorus pesticides on disposable solid-phase extraction precolumns

Stability of organophosphorus pesticides on disposable solid-phase extraction precolumns

Organophosphorus Pesticides in Water and Food, Analysis of

Solid phase extraction of organophosphorus, triazine, and triazole‐derived pesticides from water samples. A critical study

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