Determination of Propiconazole Residue in Boronia Extract (Concrete)

Groenewoud, K.; Davies, Noel W.; Menary, RC

doi:10.1021/jf00053a020

Cited by 10 publications

(7 citation statements)

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“…Angioni et al(2003) reported that the increasing weight of the peach fruit during growth leads to the decrease in pesticide levels. Groenewoud et al(1995) attributed the decrease of propiconazole residue levels in boronia leaves to dilution effects as a result of growth. However, no previous work has been found on the important mechanism of growth dilution on tea leaf growth.…”

Section: Introductionmentioning

confidence: 99%

Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Karthika

Muraleedharan

2009

J. Zhejiang Univ. Sci. B

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Abstract:The sprayed chemicals on tea leaves disappear over a period of time by the influence of rainfall elution, evaporation, growth dilution, and photodegradation. Influence of plant growth on the four fungicides (hexaconazole, propiconazole, tridemorph, and c) was studied to know the constructive loss of fungicides. The study shows that residues of fungicides sprayed on tea shoots got diluted by the growing process. The expansion of a leaf took 8 to 11 d and more than 50% of the fungicide residues were cleaned out during this leaf expansion period. Under south Indian agroclimatic condition, the fungicides are sprayed at an interval of 10 d, so it is safe that the tea is harvested on the 10th day of the application of fungicides.

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Section: Introductionmentioning

confidence: 99%

Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Karthika

Muraleedharan

2009

J. Zhejiang Univ. Sci. B

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“…The residue behavior of propiconazole in crops of wheat and vegetables has been investigated (Bai et al, 1995;Siebers et al, 1991;Singh et al, 1994). Propiconazole did not appreciably dissipate in boronia crops over the period of active growth and was detected in the matrix of boronia concrete at levels of 9.2 ppm (Groenewoud et al, 1995). Bioassays, based on inhibition of the spores of fungi on thin layer chromatographic (TLC) plates, have been used for the semiquantitative analysis of fungicides in crops (Balinova et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Dissipation of Propiconazole and Tebuconazole in Peppermint Crops (Mentha piperita (Labiatae)) and Their Residues in Distilled Oils

Garland

Menary

Davies

1998

J. Agric. Food Chem.

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The broad-spectrum, systemic fungicides propiconazole (1) and tebuconazole (2) are used to control rust in peppermint (Mentha piperita L.). An analytical method, using gas chromatography combined with detection by high-resolution mass spectrometry, was developed to allow for the simultaneous monitoring of both pesticides in peppermint leaves and oil. Field trials were established to determine the rate of dissipation of tebuconazole and propiconazole in peppermint crops. Three applications of each fungicide were trialed at two rates (125 and 250 g of active ingredient (ai)/ha). At harvest, 64 days after the final application, propiconazole was detected at levels of 0.06 mg/kg and 0.09 mg/kg of dry weight, and tebuconazole was detected at 0.26 and 0.80 mg/kg dry weight, in identical trials. Rates of dissipation of propiconazole and tebuconazole were lower at a second trial site, where three applications of 125 g/ha ai for each fungicide resulted in residue levels of 0.21 mg/kg for both pesticides, detected 89 days after the last application. Propiconazole and tebuconazole were detected in the distilled oil at levels between 0.02 and 0.05 mg/kg and between 0.011 and 0.041 mg/kg, respectively. Propiconazole had a higher tendency to co-distill with the peppermint oil, with 0.7% of that present in the vegetative material ending up in the oil, compared to 0.09% of tebuconazole.

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“…It further undergoes ring breakage to form 2-ethylhexanoic acid (m/z 88) followed probably by reduction to the propargyl radical (m/z 39). The cyclic propagation of the same transformation product (m/z 259) leads to the breakdown into 2-(2-methoxyethyl) isoindolin-1-iminium (m/z 173) [36] which, by the electron transfer and the ring opening, fragmented into prenyl (m/z 69) and into ethene (m/z 28). On the other hand, there is a feasibility of oxidation of the compound at m/z 259, which may breakdown into benzene-1,3-dinitro (m/z 168) followed by the transformation product at m/z 69 [35] and thereafter at m/z 28.…”

Section: Pathway Purposed On the Basis Of Transformation-products Idementioning

confidence: 99%

“…The reduction in COD reflects the degree to which an organic species is degraded or mineralised [37]. Therefore, the change in COD was studied for propiconazole under optimised conditions as a function of irradiation time under UV light.…”

Section: Mineralisation Of Propiconazolementioning

confidence: 99%

UV-assisted degradation of propiconazole in a TiO₂aqueous suspension: identification of transformation products and the reaction pathway using GC/MS

Kaur

Toor

Wanchoo

2015

International Journal of Environmental Analytical Chemistry

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Photocatalytic degradation of propiconazole, a triazole pesticide, in the presence of titanium dioxide (TiO 2 ) under ultraviolet (UV) illumination was performed in a batch type photocatalytic reactor. A full factorial experimental design technique was used to study the main effects and the interaction effects between operational parameters in the photocatalytic degradation of propiconazole in a batch photo-reactor using the TiO 2 aqueous suspension. The effects of catalyst concentration (0.15-0.4 gL −1 ), initial pH (3-9), initial concentration (5-35 mg L −1 ) and light conditions were optimised at a reaction time duration of 90 min by keeping area/volume ratio constant at 0.919 cm 2 mL −1 . Photocatalytic oxidation of propiconazole showed 85% degradation and 76.57% mineralisation under UV light (365 nm/30 Wm −2 ) at pH 6.5, initial concentration 25 mg L −1 and constant temperature (25 ± 1°C). The Langmuir-Hinshelwood kinetic model has successfully elucidated the effects of the initial concentration on the degradation of propiconazole and the data obtained are consistent with the available kinetic parameters. The photocatalytic transformation products of propiconazole were identified by using gas chromatography-mass spectrometry (GC/MS). The pathway of degradation obtained from mass spectral analysis shows the breakdown of transformation products into smaller hydrocarbons (m/z 28 and 39).

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Determination of Propiconazole Residue in Boronia Extract (Concrete)

Cited by 10 publications

References 4 publications

Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Dissipation of Propiconazole and Tebuconazole in Peppermint Crops (Mentha piperita (Labiatae)) and Their Residues in Distilled Oils

UV-assisted degradation of propiconazole in a TiO₂aqueous suspension: identification of transformation products and the reaction pathway using GC/MS

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Determination of Propiconazole Residue in Boronia Extract (Concrete)

Cited by 10 publications

References 4 publications

Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Contribution of leaf growth on the disappearance of fungicides used on tea under south Indian agroclimatic conditions

Dissipation of Propiconazole and Tebuconazole in Peppermint Crops (Mentha piperita (Labiatae)) and Their Residues in Distilled Oils

UV-assisted degradation of propiconazole in a TiO2aqueous suspension: identification of transformation products and the reaction pathway using GC/MS

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UV-assisted degradation of propiconazole in a TiO₂aqueous suspension: identification of transformation products and the reaction pathway using GC/MS