Determination of several pesticides with a chemical ionization ion trap detector

Mattern, Gregory C.; Singer, George M.; Louis, Judith B.; Robson, Mark M.; Rosen, Joseph D.

doi:10.1021/jf00092a013

Cited by 42 publications

(22 citation statements)

References 4 publications

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“…Hydrolysis of chlorsulfuron also produced chlorobenzenesulfonamide and aminotriazine as the major metabolites both in laboratory [1] and in field [2] studies. Phenylisocyanates [16,20,22,27,28] and anilines [16,20,22,28] have also been reported as derivatives of phenylurea herbicides. Anilines were detected as minor products only.…”

Section: Cl~-nh --C-och2chmentioning

confidence: 99%

“…In these reports the influence of the solvent was not mentioned. Formation of substituted phenyli-socyanates from their respective phenylurea precursors occurred when acetone [27], ethyl acetate [16,22], hexane [20], and dichloromethane [28] were used. Gas chromatographic determination of metabenzthiazuron has not been reported.…”

Section: Cl~-nh --C-och2chmentioning

confidence: 99%

“…Despite this, several gas chromatographic meth-ods have been reported for the determination of either the intact ureas or their breakdown products in water [14 18], soil [19,20], milk [21], cereals [22], and fruit and vegetables [23 28]. Some of these breakdown products have been identified as triazines [21,29], sulfonamides [29], isocyanates [16,20,22,27,28], and anilines [16,20,22,28].…”

Section: Introductionmentioning

confidence: 99%

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Influence of the solvent on the gas chromatographic behaviour of urea herbicides

2001

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SummaryDegradation products of chlorsulfuron, chlortoluron, diuron, fluometuron, isoproturon, Iinuron, metabenzthiazuron, metobromuron, and monuron formed in the gas chromatographic injector have been used for identification of the respective herbicides. Mass spectra of the derived compounds were obtained with a quadrupole mass spectrometric detector working in scan mode (20-450 amu). The compounds generated often depended on the solvent used for phenylurea herbicide injection (ethanol, methanol, dichloromethane, and acetonitrile). When methanol and ethanol were used as solvents the major products formed from phenylureas were carbamic acid esters. When acetonitrile or dichloromethane were used the main derivatives were phenylisocyanates. Chlorsulfuron and metabenzthiazuron, however, generated a triazine plus a phenylsulfonamide and a benzothiazolamine, respectively, irrespective of the solvent used. Linuron and diuron behaved similarly and gave degradation products with the same mass spectra. The thermal reactions occurred instantaneously in the injector block and were promoted by the high temperature selected (300 ~ Determination of the compounds derived from urea herbicides, by use of a 30 m BP10 column and a selected ion registering (SIR) program based on l",,vo or three ions, can be used for sensitive detection of the presence of urea herbicides in environmental extracts. With standards in methanol instrument detection limits ranged from 02 pg for chlorsulfuron (detected as 2-chlorobenzensulfonamide) to 1 pg for monuron and metobromuron (both detected as their carbamic acid methyl esters). RSDwere below 9% at the 5 ng L 1 level. The response was linearly dependent on quanti b, (r> 0.9986) in the 5 ng L 1 to 25 I~g L 1 range. Unequivocal identification of some phenylurea herbicides was not always possible because some herbicides with similar structures, for example diuron and hnuron, gave the same derivative.

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Section: Cl~-nh --C-och2chmentioning

confidence: 99%

Section: Cl~-nh --C-och2chmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of the solvent on the gas chromatographic behaviour of urea herbicides

2001

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“…Traditionally, pesticide residue analysis has been undertaken mainly by gas chromatography (GC) coupled to sensitive and selective detectors such as electron-capture [6,7], nitrogen-phosphorous [8], and mass-spectrometric [9] detectors, although the use of thin layer chromatography (TLC) [10,11] and immunoassay techniques [12] has been also reported.…”

Section: Introductionmentioning

confidence: 99%

Multiresidue Analysis of Phenylurea Herbicides in Environmental and Drinking Water by Capillary Electrophoresis

Barroso

Konda²,

Morovján³

1999

J. High Resol. Chromatogr.

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The present paper describes the application of capillary electrophoresis in the micellar mode to the separation and quantitative determination of five phenylurea herbicides, viz. monuron, linuron, diuron, isoproturon, and monolinuron, in water samples. Using uncoated fused silica capillary and phosphate‐borate buffer (pH 7.0) containing SDS, the five pesticides are resolved in less than 15 min and quantitatively determined by an ultraviolet detector at 244 nm. Method optimization and validation parameters are presented. Good linearity and repeatability were observed for all the compounds studied (correlation coefficients 0.999). The feasibility of the method developed was tested by simultaneous determination of these herbicides in environmental and drinking water samples at the minimum residue levels (MRLs) (0.1 μg/L) after solid‐phase extraction (SPE) preconcentration procedure.

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“…Determination of captan/folpet and trichlorfon in fruits has been reported in the literature using mainly gas chromatographic methods (Mattern et al 1990, Mattern et al 1991, Niessner et al 1999, Angioni et al 2003. The major problem of trichlorfon is its thermal instability, particularly in the injection port.…”

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confidence: 99%

Residue levels of captan and trichlorfon in field-treated kaki fruits, individual versus composite samples, and after household processing

Fernández-Cruz¹,

Grimalt²,

Villarroya³

et al. 2006

Food Additives and Contaminants

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The dissipation of residue levels of captan and trichlorfon in field-treated kaki crops 3 were followed according to Good Laboratory Practice (GLP). Residue levels of captan 4 and trichlorfon were determined by GC/MS and LC-MS/MS enabling maximum residue 5 limits (MRLs) of 3 and 5 mg/kg, respectively to be proposed. The behaviour of these 6 residues was also studied after peeling and cooking and in individual kaki fruits 7 compared with composite samples. Residue levels of these compounds for individual 8 fruits suggested that a variability factor up to 3 could be set for the acute risk 9 assessment. Levels of captan decreased more than 90 % after peeling and completely 10 after cooking. About 70% of the residue at the pre-harvest interval (PHI) for trichlorfon 11 was found to penetrate into the flesh of the kaki fruit. Cooking resulted in a reduction 12 of 27% of trichlorfon residue levels. 13 14 15

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Determination of several pesticides with a chemical ionization ion trap detector

Cited by 42 publications

References 4 publications

Influence of the solvent on the gas chromatographic behaviour of urea herbicides

Influence of the solvent on the gas chromatographic behaviour of urea herbicides

Multiresidue Analysis of Phenylurea Herbicides in Environmental and Drinking Water by Capillary Electrophoresis

Residue levels of captan and trichlorfon in field-treated kaki fruits, individual versus composite samples, and after household processing

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