Determination of organophosphorus pesticide residues in fruits and vegetables on the Swedish market from 1964 to 1968

Abstract A simple method for determination of organophosphorus pesticide residues at the parts per million level In milk was developed. Pesticide residues were extracted with acetonitrlle added to aqueous milk, fat was removed by zinc acetate addition and dichloromethane partition, and analytes were concentrated and analyzed by wide-bore capillary column gas chromatography. Recoveries of 6 pesticides spiked in milk samples at levels of 0.1 and 1.0 μg/mL were 82.1- 93.8% and 79.7-96.6%, respectively. Triplicate samples spiked with 6 pesticides at 1 itg/mL were analyzed independently by 3 laboratories. Average recoveries were greater than 80%, and the mean coefficients of variation for the complete study were 2.9% for diazlnon, 5.4% for dimethoate, 4.6% for malathlon, 4.6% for parathlon, 4.9% for EPN, and 6.1% for phosalone.

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Optimization of Sweep Codistillation Apparatus for Determination of Coumaphos and Other Organophosphorus Pesticide Residues in Animal Fat

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/70.3.442 ◽

1987 ◽

Vol 70 (3) ◽

pp. 442-445

Author(s):

Robert L Brown ◽

Clinton N Farmer ◽

Roderick G Millar

Keyword(s):

Coefficient Of Variation ◽

Pesticide Residues ◽

Organophosphorus Pesticides ◽

Organophosphorus Pesticide ◽

Optimum Conditions ◽

Animal Fat ◽

Sweep Time ◽

Coefficients Of Variation ◽

The Mean

Abstract Optimum conditions have been developed for the quantitative recovery of coumaphos from animal fat by using a commercial sweep codistillation unit. Under the conditions specified (255°C distillation temperature, 250 mL/min of nitrogen, 60 min sweep time) and using Florisil trapping, the mean recovery of coumaphos was 91% with a coefficient of variation of 6%. Other organophosphorus pesticides recovered include diazinon, chlorpyrifos, ethion, and bromophos-ethyl with recoveries ranging from 90 to 96% and coefficients of variation ranging between 4 and 6%.

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Collaborative Study of Confirmative Procedures by Single Sweep Oscillographic Polarography for the Determination of Organophosphorus Pesticide Residues in Nonfatty Foods

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/52.4.811 ◽

1969 ◽

Vol 52 (4) ◽

pp. 811-817

Author(s):

Raymond J Gajan

Keyword(s):

Pesticide Residues ◽

Methyl Parathion ◽

Collaborative Study ◽

Organophosphorus Pesticide ◽

Oscillographic Polarography ◽

Quantitative Results ◽

Multiple Detection

Abstract Ten laboratories collaboratively studied several single sweep oscillopolarographic methods designed to be used as confirmative procedures for several organophosphorus pesticide residues determined by GLC. Polarographic methods for the detection and determination of parathion, methyl parathion, diazinon, and/or malathion at 0.5 and 2.0 ppm in extracts of apples and lettuce were included in this study. All 10 laboratories successfully detected the organophosphorus pesticide residues and quantitative results were reported by seven laboratories. These results show that the polarographic methods can be used for rapidly confirming results obtained by the multiple detection procedures now in use.

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