A field unit for determining dimethoate in fruit and vegetable dips

Noble, Alan; Walsh, John; Outhwaite, R.J.

doi:10.1002/ps.2780290403

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Many methods have been developed for the determination of dimethoate such as colorimetry, [3][4][5] polarography, [6][7] HPLC, 8 GC, 9 TLC, 10 spectrofluorometry 11 and spectrophotometry. 12 But these methods offer certain disadvantages such as less sensitivity, stability selectivity, high reagent consumption and interference of foreign species.…”

Section: Introductionmentioning

confidence: 99%

Extractive Spectrophotometric determination of Dimethoate in Environmental Samples with Azure‐B

Reddy

Chiranjeevi

2005

Journal of Chemistry

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A new simple and selective spectrophotometric method is developed for the determination of dimethoate by using Azure-B is described. The method was based on the alkaline hydrolysis of dimethoate in presence of sodium ethoxide to form sodium dimethyl dithiophosphate (Na-DMDTP). The Na-DMDTP was formed as an ion-pair complex with cationic dye, azure-B. The ion-pair complex was extracted into chloroform. The color of the organic layer was measured at 535 nm. The method was applied to the determination of dimethoate residues in water, grain and soil samples.

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Section: Introductionmentioning

confidence: 99%

Extractive Spectrophotometric determination of Dimethoate in Environmental Samples with Azure‐B

Reddy

Chiranjeevi

2005

Journal of Chemistry

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Dissipation kinetics and risk assessment of thiamethoxam and dimethoate in mango

Bhattacherjee

Dikshit

2016

Environ Monit Assess

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Thiamethoxam and dimethoate are two insecticides used to control hoppers and inflorescence midges in mango. Thiamethoxam (0.008 and 0.016%) and dimethoate (0.06 and 0.12%) were sprayed on Dashehari mango trees during the pre-mature stage of fruit (first week of May) to study their dissipation kinetics and risk assessment in mango fruit. Thiamethoxam dissipated in fruit from 1.93 and 3.71 mg kg(-1) after 2 h of spraying to 0.08 and 0.13 mg kg(-1) after 20 days of spraying at single and double doses, respectively. Its residue did not persist beyond 20 days in fruit. Dimethoate dissipated in fruit from 2.81 and 5.34 mg kg(-1) after 2 h of application to 0.12 and 0.19 mg kg(-1) after 10 days of application at single and double doses, respectively. No residue was detected in fruit beyond 10 days after its application. Both ready-to-harvest mature mango fruit and pulp (after 40 days of spraying) were free from any residues of these insecticides at both the concentration levels. The rate of dissipation of these insecticides followed first-order kinetics in fruit with residual half-lives of 4.0 to 4.5 days for thiamethoxam and 2 days for dimethoate. Based on their MRL values of 0.5 and 2.0 mg kg(-1) in mango, pre-harvest intervals of 7 and 11 days, and 6 and 7 days were suggested for thiamethoxam and dimethoate, respectively, after spraying at single and double doses. The theoretical maximum residue contribution (TMRC) values for both the insecticides, calculated for residues corresponding to each sampling date, were found to be below the maximum permissible intake (MPI) values on mango fruit (except for dimethoate double dose up to 3 days); hence, both thiamethoxam and dimethoate could be considered non-hazardous to consumers at the above doses and time intervals.

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A field unit for determining dimethoate in fruit and vegetable dips

Cited by 2 publications

References 6 publications

Extractive Spectrophotometric determination of Dimethoate in Environmental Samples with Azure‐B

Extractive Spectrophotometric determination of Dimethoate in Environmental Samples with Azure‐B

Dissipation kinetics and risk assessment of thiamethoxam and dimethoate in mango

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