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  • 1
    Electronic Resource
    Electronic Resource
    Determination of corn herbicides by GC-MS and GC-NPD in environmental samples (1994)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 42 (1994), S. 2210-2214 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf00046a025
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  • 2
    Electronic Resource
    Electronic Resource
    Enhancement of wheat tolerance to triallaic with the safener MON 5501 (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 32 (1992), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The triallate tolerance of wheat (Triticum aestivum L.) cultivars Marius and Mexicali was determined under growth-chamber conditions. Mexicali was found to tolerate triallate at levels about fourfold higher than Marius. The susceptible wheat cultivar was protected against triallate by seed treatment with MON 5501. The herbicide concentration in the aerial part of the plants was determined by gas chromatography. Triallate levels were similar in both cultivars treated with 0.5 mg 1−1 of triallate. The safener did not affect the triallate content per plant in the susceptible wheat cultivar treated with 1 mg 1−1 of herbicide. Augmentation de la tolerance du blé au triallate avec le phytoprotecteur MON 5501La tolerance au triallate des cultivars de ble Marius et Mexicali a été déterminée en chambre climatique. Mexicali s'est avéré 4 fois plus tolérant que Marius. Le cultivar de blé sensible a été protege du triallate par un traitement des grains avec MON 5501. La concentration en herbicide dans la partie aérienne des plantes a été determined par chromatographie gazeuse. Les taux de triallate ont été equivalents chez les 2 cultivars traites avec 0,5 mg l−1 de triallate. Le phytoprotecteur n'a pas affecté lateneur en triallate par plante chez le cultivar sensible traite avec 1 mg 1−1 d'herbicide. Verbesserung der Toleranz von Weizen gegenuber Triallat mil dem Antidot MON 5501Die Triallat-Toleranz der Weizensorten ‘Marius’ und ‘Mexicali’ wurde im Phytotron bestimmt. ‘Mexicali’ war etwa 4mal toleranter als ‘Marius’. Die empfindliche Weizensorte wurde durch Beizung mit MON 5501 gegen Triallat geschützt. Die Herbizidkonzentration in den oberirdischen Pflanzenteilen wurde gaschromatographisch bestimmt Der Wirkstoff-Gehalt war in beiden mit 0,5 mg 1−1 Triallat behandelten Sorten ahnlich hoch. Das Antidot hatte keinen Einfluβ auf den Triallat-Gehalt der empfindlichen Weizensorte, die mit 1 mg 1−1 behandelt worden war.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1992.tb01887.x
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of bromoxynil and ioxynil residues in cereals and soil by GC-ITD (1994)
    Springer
    Chromatographia 38 (1994), S. 624-628 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Ion-trap detection ; Nitriles ; Cerelas ; Perfluoroacylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Bromoxynil and ioxynil have been determined inplants and soil by gas chromatography. These herbicides are extracted from soil samples with methylene chloride at acidic pH. Plant samples are extracted with a basic acqueous solution and extracts purified by solvent partitioning. Herbicide residues are submitted to perfluoroacylation prior to GC separation. These compoiunds are determined by ion-trap detection with single ion monitoring; N-(3-chloro-4 methyl-phenyl_ perfluoropropyl amide is used as internal standard. The detection limit of the method is near 0.001 μg g−1 for the samples studied. The proposed methods are sensitive and reproducible enough to allow determination of these herbicides at residue levels in plants and soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277165
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  • 4
    Electronic Resource
    Electronic Resource
    GC-ITD analysis of chlortoluron and its metabolites in cereals (1993)
    Springer
    Chromatographia 36 (1993), S. 195-200 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-ion trap detection ; Chlortoluron and metabolites ; Cereals ; Phenylureas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Chlortoluron and its metabolites have been determined in cereals by gas chromatography. Chlortoluron is pyrolyzed to the corresponding phenylisocyanate, which is determined by GC with nitrogen-phosphorous detection (NPD) and confirmed by GC with ion trap detection (ITD).N-demethyl metabolites of chlortoluron are determined, after conversion to the perfluoroacyl derivatives, by GC with ion trap detection by single ion monitoring;N-ethyl-p-chloroacetanilide is used as internal standard. The hydroxymethyl metabolite, mainly present as β-glucoside, can be analyzed, after enzymatic hydrolysis with β-glucosidase and conversion to the ethyl derivative, by GC with ion trap detection by SIM;N-ethylchlortoluron is used as internal standard. The methods proposed are reproducible and sensitive enough for determination of these compounds at residue levels in cereals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02263862
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of organophosphorus pesticide residues in fruits by gas chromatography with ITD and NPD detection (1996)
    Springer
    Chromatographia 43 (1996), S. 380-386 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography-mass spectrometry ; Pesticide residues in fruit ; Organophosphorus compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Several widely used organophosphorus insecticides, diazinon, methyl-parathion, fenitrothion, malathion, fenthion and methidathion were selected for inclusion in this work. A comparative study of the multiresidue determination of these compounds in citrus fruit and grapes has been carried out by gas chromatography with nitrogen-phosphorus and ion trap detection. Samples were spiked with 0.1, 0.5 and 1 mg kg−1 of each pesticide and blended in a Sorvall homogeniser with ethyl acetate. Column clean-up on Florisil was necessary for citrus peel extracts. The average recoveries varied from 81 to 107% with a relative standard deviation between 0.3 and 9.5% for GC-ITD and from 86 to 104% with a relative standard deviation ranging from 1.4 to 8.0% for GC-NPD. The detection limit of the method was 10 ng g−1 or less for each organophosphorus insecticide, with both detectors. This method was applied to the analysis of treated lemons and 0.25 mg kg−1 of fenitrothion in fruit was detected a week after treatment and identified by its mass spectrum. The results obtained showed that the proposed methods are reproducible and sensitive enough for the simultaneous determination of these insecticides in fruits at residue level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271015
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  • 6
    Electronic Resource
    Electronic Resource
    High performance liquid chromatography determination of prochloraz residues in citrus fruit (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 268-270 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Citrus fruit ; Fungicide residues ; Prochioraz ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070507
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of chlorotoluron, isoproturon and metoxuron in soil by GLC-NPD and confirmation using GLC-MS (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 413-416 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The analysis of several phenyl urea herbicides in soil by GLC-NPD, directly or after alkylation, and the confirmation of residues by GLC-ITD is reported. Soil was extracted with methanol, the organic solvent evaporated, the residue dissolved in hexane and then analyzed by gas chromatography on a 3% OV-17 glass packed column. An aliquot of the extract was ethylated overnight with EtI, NaH and Me2SO as solvent. The mixture was hydrolyzed, the ethylated compounds extracted with hexane and determinated by GLC-NPD on a BP-5 fused silica capillary column. Values obtained with the direct GLC analysis were reproducible and similar to those obtained after ethylation. Recovery of each herbicide was higher than 80% and the limit of detection was 0.01 ppm. These compounds were also analyzed by GLC-ITD. The sensitivity in the SIM mode was near 0.1 ng and the residues can be confirmed with this technique down to 0.01 ppm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322361
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  • 8
    Electronic Resource
    Electronic Resource
    GLC multiresidue analysis of postharvest fungicides in citrus fruit (1987)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 328 (1987), S. 105-107 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A simple GLC multiresidue method for the analysis of fenpropimorph, thiabendazole, imazalil, propiconazole and prochloraz residues in citrus fruit, with a limit of detection of 0.1 ppm, is reported. The fungicides are extracted with hexane: ethyl acetate (90:10, v/v) after pH-adjustment of the fruit homogenate. The GLC-separation is carried out using a bonded phase, SE-54, fused silica capillary column and fungicides are determined with a nitrogen-phosphorus detector. Recovery was always higher than 80% with standard deviation equal or lower than 7%. The method is suitable to determine residues in citrus, whole fruit or peel, treated with these fungicides at usual concentrations to avoid citrus decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00560960
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