Worker environment research. III. A rapid method for the semi-quantitative determination of some dislodgable pesticide residues on citrus foliage

Smith, Charles A.; Günther, F. A.; Adams, James D.

doi:10.1007/bf01812640

Cited by 11 publications

(2 citation statements)

References 4 publications

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“…Worker reentry regulations determined by mathematical modeling based on the known toxicology and environmental behavior of organophosphorus insecticides have been suggested (3)(4)(5). A recent report stresses field monitoring with portable equipment for actual residue levels before worker reentry (6). A third approach utilizes the prediction of pesticide levels on leaf surfaces through the use of weather models of pesticide behavior (7,8).…”

Section: Discussionmentioning

confidence: 99%

A comparison of time and time-weather models for predicting parathion disappearance under California conditions

Nigg¹,

Allen²

1979

Environ. Sci. Technol.

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Section: Discussionmentioning

confidence: 99%

A comparison of time and time-weather models for predicting parathion disappearance under California conditions

Nigg¹,

Allen²

1979

Environ. Sci. Technol.

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“…The reentry problem has been reviewed by Gunther et al (1977). Smith et al (1977) reported a method for foliage whereby residues were directly transferred to a paper strip, paper chromatographed, and then reacted with 4-(pnitrobenzyl)pyridine (NBP) to form a "blue" color. Comparison of the obtained color with a reference color chart gave an estimate of the insecticide level.…”

mentioning

confidence: 99%

Worker environment research: rapid field method for estimation of organophosphorus insecticide residues on citrus foliage and in grove soil

Berck¹,

Iwata²,

Günther³

1981

J. Agric. Food Chem.

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A field unit for determining dimethoate in fruit and vegetable dips

1990

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The concentration of dimethoate in post‐harvest dips needs to be maintained at 400 or 500 mg litre−1 to ensure that fruit fly are killed and also to keep residue levels below the MRL. A field unit which contains a colorimeter, a heating block and cooling positions has been evaluated. The diluted dip sample produces a colour with 4‐(p‐nitrobenzyl)pyridine after heating and the addition of tetraethylenepentamine. Precision of the unit was acceptable for a field test (repeatability of ± 10.1%) and there was reasonable agreement between determinations made on the unit and by an HPLC method for a range of dimethoate concentrations from 300 to 700 mg litre−1. The unit can be used at the dip site and the analysis is completed in 30 minutes.

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Worker environment research. III. A rapid method for the semi-quantitative determination of some dislodgable pesticide residues on citrus foliage

Cited by 11 publications

References 4 publications

A comparison of time and time-weather models for predicting parathion disappearance under California conditions

A comparison of time and time-weather models for predicting parathion disappearance under California conditions

Worker environment research: rapid field method for estimation of organophosphorus insecticide residues on citrus foliage and in grove soil

A field unit for determining dimethoate in fruit and vegetable dips

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