A General Method for Organophosphorus Pesticide Residues in Nonfatty Foods

1971 ◽  
Vol 54 (3) ◽  
pp. 513-516 ◽  
Author(s):  
R W Storherr ◽  
P Ott ◽  
R R Watts
Keyword(s):  
Potassium Chloride ◽  
Pesticide Residues ◽  
Organophosphorus Pesticides ◽  
Extraction Procedure ◽  
Organophosphorus Pesticide ◽  
Flame Photometric Detector ◽  
Chlorinated Hydrocarbon ◽  
Photometric Detector ◽  
General Method

Abstract A method is presented for determining residues of organophosphorus pesticides and alteration products in nonfatty foods. This method employs the acetonitrile extraction procedure as used by FDA for the chlorinated hydrocarbon pesticides. Cleanup is performed with a short charcoal column. GLC, using the potassium chloride thermionic detector or flame photometric detector, is used for determination. Forty-one organophosphorus pesticides and/or alteration products are evaluated.

Charcoal Column Cleanup Method for Many Organophosphorus Pesticide Residues in Crop Extracts

1969 ◽  
Vol 52 (3) ◽  
pp. 522-526 ◽  
Author(s):  
Randall R Watts ◽  
R W Storherr ◽  
John R Pardue ◽  
Theodore Osgood
Keyword(s):  
Ethyl Acetate ◽  
Potassium Chloride ◽  
Pesticide Residues ◽  
Organophosphorus Pesticides ◽  
Organophosphorus Pesticide ◽  
Analytical Results

Abstract In the charcoal column cleanup method for organophosphorus pesticide residues in crops, the pesticides arc extracted from the crops with ethyl acetate and a 10–20 g aliquot is placed directly on the charcoal adsorbent column for cleanup. The Kuderna-Danish concentrated eluate is analyzed by GLC, using the potassium chloride thermionic detector. Analytical results are presented for pesticide field-treated crops and for crop extracts fortified with a total of 60 parent organophosphorus pesticides and alteration products. Recoveries averaged 90% or better in most cases.

scholarly journals MONITORING OF ORGANOPHOSPHORUS PESTICIDE RESIDUES IN FLUID AND POWDERED MILK BY GAS CHROMATOGRAPHY WITH FLAME PHOTOMETRIC DETECTOR

Química Nova ◽  
2014 ◽  
Author(s):  
Lucia Helena Pinto Bastos ◽  
Adherlene Vieira Gouvêa ◽  
Nina Daddário Ortiz ◽  
Maria Helena W. Morelli Cardoso ◽  
Silvana do Couto Jacob ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Pesticide Residues ◽  
Organophosphorus Pesticide ◽  
Powdered Milk ◽  
Flame Photometric Detector ◽  
Photometric Detector

Modified Storherr Method for Determination of Organophosphorus Pesticides in Nonfatty Food Total Diet Composites

1981 ◽  
Vol 64 (3) ◽  
pp. 714-719
Author(s):  
Louis J Carson
Keyword(s):  
Liquid Chromatography ◽  
Pesticide Residues ◽  
Organophosphorus Pesticides ◽  
Organophosphorus Pesticide ◽  
Gas Liquid Chromatography ◽  
Flame Photometric Detector ◽  
Limit Of Quantitation ◽  
Total Diet ◽  
Residue Levels

Abstract The method of Storherr et al. for organophosphorus pesticide residues in nonfatty foods has been modified to permit its use in analyzing the composites of nonfatty foods in the Food and Drug Administration Total Diet Program. Modifications were designed to permit the examination by gas-liquid chromatography (GLC) of the larger weight (100 mg) of sample equivalent required by the Total Diet program. To achieve a limit of quantitation of 2 ppb parathion, the organophosphorus pesticides are determined by GLC equipped with flame photometric detector (P-mode) and/or KCl thermionic detector. Recovery data, ranging from 70 to 133%, are presented for fortification (2-10 ppb) of organophosphorus pesticides in 7 nonfatty food Total Diet composites. The modified Storherr method was successfully tested in an intralaboratory method trial of 2 Total Diet composites (potatoes and legumes) fortified at 5-13 ppb with malathion, parathion, paraoxon, and monocrotophos. In addition, the modified Storherr method was compared to existing FDA Total Diet methodology for the determination of incurred organophosphorus residues. Residue levels found by both methods were similar for malathion (30 ppb), parathion (7 ppb), and diazinon (1 ppb), but only the modified Storherr method was capable of determining about 10 ppb dimethoate and phorate in the cereals and grains composite.

scholarly journals Determination of Organophosphorus Pesticide Residues in Winter Bamboo Shoots by Homogenate Extraction Coupled with Gas Chromatography-Flame Photometric Detector

2020 ◽  
pp. 7-12
Author(s):  
Zhu Yu-Xin ◽  
Xu Liu-Yue ◽  
Feng Qi ◽  
Zhu Miao-Qin
Keyword(s):  
Gas Chromatography ◽  
Pesticide Residues ◽  
Limit Of Detection ◽  
Organophosphorus Pesticides ◽  
Flame Photometric Detector ◽  
Photometric Detector ◽  
Bamboo Shoots ◽  
Homogenate Extraction ◽  
Relative Standard

Excessive use of organophosphorus pesticides (OPPs) in fruits and vegetables may affect human health. In this paper, a simple, rapid and effective method for the determination of five OPPs in winter bamboo shoots by gas chromatography-flame photometric detector (GC-FPD) was developed. Three extractants and three extraction methods were examined respectively. The results showed that the recovery rate was higher when the samples were extracted by acetonitrile and treated with homogenate extraction method. Under the optimized conditions, recoveries ranged from 82.12% to 91.48% with the relative standard deviation (RSD) of 1.51-4.20% and the limit of detection (LOD) of 0.005-0.02 μg/mL. Results showed that using acetonitrile as extractants and homogenate extraction in sample preparation is an effective method in determination of pesticide residues in winter bamboo shoots.

Collaborative Study of a Method for Organophosphorus Pesticide Residues in Apples and Green Beans

1974 ◽  
Vol 57 (4) ◽  
pp. 930-933
Author(s):  
Ronald R Laski
Keyword(s):  
Potassium Chloride ◽  
Pesticide Residues ◽  
Organophosphorus Pesticides ◽  
Collaborative Study ◽  
Organophosphorus Pesticide ◽  
Oxidation Products ◽  
Green Beans ◽  
Average Recovery ◽  
Oxygen Analog ◽  
Precision And Accuracy

Abstract Ten laboratories took part in a collaborative study of a method for organophosphorus pesticide residues in apples and green beans. Six representative organophosphorus pesticides or oxidation products were determined in duplicate at a different level on each crop. The average recovery of the pesticides, using the gas chromatographic potassium chloride thermionic detection system, had the precision and accuracy expected for parathion, paraoxon, carbophenothion oxygen analog, carbophenothion, and EPN. Interference due to reagents made quantitation of dimethoate inaccurate. The average recovery (%) of the pesticides on apples and beans, respectively, was as follows: dimethoate 125.1 and 112.9; paraoxon 99.3 and 103.7; parathion 86.5 and 92.2; carbophenothion oxygen analog 96.7 and 100.1; carbophenothion 88.8 and 102.6; and EPN 90.8 and 98.3. A separate part of the study involved a comparison between the potassium chloride thermionic gasliquid chromatographic detector and the phosphorus- specific flame photometric detector. A statistical analysis of the results obtained from 5 laboratories indicated that the 2 detection systems were equivalent in both precision and accuracy.

scholarly journals Study of the Effect of Air to Fuel Ratio Parameter on the Organophosphorus – Pesticide Analysis by GC-FPD

2014 ◽  
Vol 36 ◽  
pp. 236-248
Author(s):  
A.Y. Kilany ◽  
Mohamed A. Elsayed ◽  
M.K. Abd El Megid ◽  
M.S. Fayed
Keyword(s):  
Dynamic Range ◽  
Organophosphorus Pesticides ◽  
Organophosphorus Pesticide ◽  
Acute Poisoning ◽  
Present Contribution ◽  
Flame Photometric Detector ◽  
Fuel Ratio ◽  
Relative Flow Rate ◽  
Photometric Detector ◽  
Relative Standard

In the present contribution, sensitive and precise method for the quantification of Organophosphorus / Pesticides (Malathion and Dimethoate) in nanograms range has been developed. The performance of flame photometric detector (FPD), a selective detector (P&S-mode) that can be used in the analysis of organophosphorus compound, is evaluated in terms of sensitivity, selectivity and reproducibility. The performance of flame photometric detector was strongly depending on the absolute and relative flow rate of air and hydrogen gases. The optimum air-to-fuel ratio for detection of Malathion and Dimethoate was 0.4 and 0.3 (FPD-P mode). At this ratio, low picogram amounts of phosphor can be detected accurately (0.18 pgP) with a wide linear dynamic range of 0.18 pgP to 298 ngP. While, the optimum air-to-fuel ratio, for detection of Malathion and Dimethoate was 0.6 (FPD-S mode). In addition to, the method is precise with 4.5 % relative standard deviation (RSD). In conclusion, it could be proposed that this procedure can be recommended as a suitable method for the quantification of Malathion and Dimethoate in cases of acute poisoning.

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