Effect of environmental and biological factors on persistence of malathion applied as ultra-low-volume or emulsifiable concentrate to cotton plants

Awad, Toson M.; Vinson, S. Bradleigh; Brazzel, J. R.

doi:10.1021/jf60154a032

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…In addition, the rapid dissipation of originally applied pesticide are dependent on a variety of environmental factors such as sunlight and temperature [32]. However, high temperature is reported to the major factor in reducing the pesticides from plant surface [33]. Light plays an important role in the behavior of pesticide in the environment [34].…”

Section: Discussionmentioning

confidence: 99%

Determination of Imidacloprid and Tetraconazol Residues in Cucumber Fruits

Nasr¹,

Abbassy²,

Marzouk³

et al. 2014

J Pollut Eff Cont

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The experimental design was a complete randomized blocks design with two treatments for imidacloprid and tetraconazole in addition to control. Each treatment includes three replicates. The application was carried out using knapsack sprayer equipped with one nozzle. Its residues on and in cucumber fruits collected after one hour, 1, 3, 5, 8, 11, 15 and 21 days from last spray were lower than the maximum residue limit (MRL) of imidacloprid and tetraconazole on cucumber fruits. The results obtained revealed that the residual level of imidacloprid was less than the maximum residual level (MRL=1 mg/kg) which recommended by Codex Alimentration Commission, and the residual level of tetraconazole was less than the maximum residual level (MRL=0.2 mg/kg) which recommended by Codex Alimentration Commission. Also, the results showed that tetraconazole high persistence (t 1/2 =1.4 days) than imidacloprid (t 1/2 =2.2 days) on cucumber fruits.

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Section: Discussionmentioning

confidence: 99%

Determination of Imidacloprid and Tetraconazol Residues in Cucumber Fruits

Nasr¹,

Abbassy²,

Marzouk³

et al. 2014

J Pollut Eff Cont

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show abstract

“…Plant growth particularly for fruits is also responsible to a great extent for decreasing the pesticide residue concentrations due to growth dilution effects [32] In addition, the rapid dissipation of originally applied pesticide are dependent on a variety of environmental factors such as sunlight and temperature [33]. However, high temperature is reported to the major factor in reducing the pesticides from plant surface [34]. Light plays an important role in the behavior of pesticide in the environment [35].…”

Section: Discussionmentioning

confidence: 99%

Determination of Imidacloprid and Tetraconazol Residues in Cucumber Plants after whitefly and powdery mildew control

Abbassy

Marzouk

Nasr

et al. 2014

ACHE

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The present study was carried out to determine the residues of the neonicotinoid insecticide imidacloprid , and the fungicide tetraconazole and their persistence in and on cucumber fruits after whitefly and powdery mildew control .The field experimental design was a complete randomized blocks design with two treatments for imidacloprid and tetraconazole in addition to control (42m 2).The application was carried out using knapsack sprayer equipped with one nozzle. Cucumber fruits samples were collected from each replicate (one Kg) at time intervals of one hour after application(zero time), 1 , 3 , 5 , 8 , 11 , 15 and 21 days after treatment with imidacloprid and tetraconazole. Estimation of imidacloprid residues were performed by High pressure liquid chromatography equipped with diode array UV detector .Quantitative analysis of tetraconazole residues were performed by Perkin gas chromatograph (GLC), equipped with electron capture detector (ECD. Result indicated that the recovery percentage of tetraconazole and imidacloprid were 91.62 % and 117.5% respectively. The initial deposit (one hour after application) was 0.943 mg/kg. while the detected residue amounts were 0.365, 0.271, 0.226, 0.086, 0.049, 0.028 and 0.013mg/kg of imidacloprid after 1, 3, 5, 8, 11, 15 and 21days of treatment, respectively. The calculated half life (t 1/2) value of this insecticide was 2.2 days. On the other hand the initial deposit of tetraconazole on and in cucumber fruits was 0.1742 mg/kg The obtained residual half-life value (t 1/2) of tetraconazole on and in cucumber fruits was 1.4 day. Data also revealed that the first day following application is critical in the sense of sharply decrease that reach 61.29% from the initial deposit of imidacloprid on cucumber fruits, but the loss of tetraconazole at first day was 40.41% from the initial residues on cucumber fruits.

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“…The corresponding oxon was confirmed by GC analysis of com forage treated with emulsifiable concentrate formulation of (152) but its route of formation was ambiguous due to the harsh Soxhlet extraction (Bowman and Leuck 1971). Malathion (167) is considered to be also resistant to direct photolysis, and only hydrolysis of ester linkages is a dominant pathway (Awad et al 1967;EI-Refai and Hopkins 1972;Mostafa et al 1974). Metabolism of 14C_ and 32P-phenthoate (168) in Valencia orange leaves and fruit showed that the main degradation pathways on the surface were P=S oxidation to the oxon, stepwise hydrolysis at the S-C bond and carboxylate moiety to mandelic acid, and hydrolysis of the P-S bond followed by formation of disulfide (Takade et al 1976).…”

Section: Photodegradation Of Pesticides On Plantsmentioning

confidence: 98%

“…The volatilization loss was greatly reduced on silica gel, with the main product being the oxon (Mikami et al 1977b). Loss of (167) from the glass surface was mainly due to thermal vaporization (Awad et al 1967;El-Refai and Hopkins 1972). The basic photochemistry was almost the same for propaphos (159) either on glass or silica gel and was characterized by the significant formation of the S-oxidized derivatives (Fujii et al 1979).…”

Section: Photodegradation Of Pesticides On Glass and Silica Gel Sumentioning

confidence: 99%

Reviews of Environmental Contamination and Toxicology

2004

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Effect of environmental and biological factors on persistence of malathion applied as ultra-low-volume or emulsifiable concentrate to cotton plants

Cited by 11 publications

References 10 publications

Determination of Imidacloprid and Tetraconazol Residues in Cucumber Fruits

Determination of Imidacloprid and Tetraconazol Residues in Cucumber Fruits

Determination of Imidacloprid and Tetraconazol Residues in Cucumber Plants after whitefly and powdery mildew control

Reviews of Environmental Contamination and Toxicology

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