A general method for the determination of organophosphorus pesticide residues in river waters and effluents by gas, thin-layer and gel chromatography

The Analyst ◽  
1969 ◽  
Vol 94 (1117) ◽  
pp. 275 ◽  
Author(s):  
J. Askew ◽  
J. H. Ruzicka ◽  
B. B. Wheals
Keyword(s):  
Thin Layer ◽  
Pesticide Residues ◽  
Organophosphorus Pesticide ◽  
Gel Chromatography ◽  
River Waters ◽  
General Method

General Method for Determination of Pesticide Residues in Samples of Plant Origin, Soil, and Water. II. Thin Layer Chromatographic Determination

1981 ◽  
Vol 64 (3) ◽  
pp. 743-748 ◽  
Author(s):  
Árpád Ambrus ◽  
Éva Hargitai ◽  
Gabriella Károly ◽  
András Fülöp Ambrus ◽  
János Lantos Ambrus
Keyword(s):  
Thin Layer ◽  
Pesticide Residues ◽  
Unknown Origin ◽  
Chromatographic Determination ◽  
Plant Origin ◽  
Coefficients Of Variation ◽  
Rf Values ◽  
Soil And Water ◽  
General Method

Abstract o-Tolidine plus KI, p-nitrobenzene-diazoniumfluoroborate, bioassay with fungi and enzyme sources, AgNO3 plus UV radiation, and p-dimethyl-aminobenzaldehyde modes of detection have been selected for TLC screening of pesticide residues in extracts of samples of unknown origin. Single solvents were used for the elution. Coefficients of variation of Rf values were studied as a function of Rf and eluants. Indicator compounds were used for controlling the proper conditions of detection. The detectability of 188 pesticide compounds was tested, and the minimum detectable amounts were determined.

Additional Cleanup of Samples on GLC Column for TLC Determination of Pesticide Residues

1967 ◽  
Vol 50 (3) ◽  
pp. 615-623
Author(s):  
Kenneth T Hartman
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Pesticide Residues ◽  
Gas Liquid Chromatography ◽  
Rf Values ◽  
Layer Chromatography

Abstract Gas-liquid chromatography (GLC) following conventional isolation procedures has been used to clean up pesticide residues for confirmation by thin layer chromatography (TLC). This procedure is more rapid and efficient than present cleanup procedures and permits the determination of pesticide residues that do not survive these rigorous acid or alkali treatments. The method also permits TLC confirmation of pesticide residues that have similar Rf values but different GLC retention times. Recoveries ranged from 85 to 105% for 25 of 28 pesticides tested

Simple Analytical Method for Organophosphorus Pesticide Residues in Milk

1990 ◽  
Vol 73 (5) ◽  
pp. 770-772
Author(s):  
Masatake Toyoda ◽  
Kazuhiko Adachi ◽  
Tadakazu Ida ◽  
Katsuhiko Noda ◽  
Norio Minagawa
Keyword(s):  
Pesticide Residues ◽  
Milk Fat ◽  
Capillary Column ◽  
Organophosphorus Pesticide ◽  
Simple Method ◽  
Coefficients Of Variation ◽  
Complete Study ◽  
The Mean ◽  
Capillary Column Gas Chromatography

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.

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

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%.

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

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.

Sign in / Sign up

Export Citation Format

Share Document