Single column gas liquid chromatography of methyl parathion and metabolites using temperature programming

1970 ◽  
Vol 5 (2) ◽  
pp. 111-114
Author(s):  
P. S. Jaglan ◽  
F. A. Gunther
Keyword(s):  
Liquid Chromatography ◽  
Methyl Parathion ◽  
Gas Liquid Chromatography ◽  
Temperature Programming ◽  
Single Column

High-Performance and Gas-Liquid Chromatography of Methyl Parathion Formulations

1976 ◽  
Vol 59 (4) ◽  
pp. 740-744
Author(s):  
Edwin R Jackson
Keyword(s):  
Liquid Chromatography ◽  
High Performance ◽  
Methyl Parathion ◽  
Hplc Method ◽  
Gas Liquid Chromatography ◽  
Synthetic Sample ◽  
Average Value ◽  
Flame Ionization ◽  
Ultraviolet Detector ◽  
Technical Material

Abstract Methyl parathion formulations (a synthetic sample, a technical material, and 6 emulsifiable concentrates) were analyzed by high-performance liquid chromatography (HPLC), gas-liquid chromatography (GLC), and infrared (IR) spectroscopy. The HPLC method used in ultraviolet detector and a Permaphase ODS column with a methanol-water mobile phase. The GLC method used an SE-30/OV-210 column and flame ionization detection. The IR spectrum was recorded at 8.16 μm. A synthetic sample formulated to contain 45.5% methyl parathion (analytical grade) was analyzed 8 times by each method. HPLC yielded an average value of 45.4%, GLC 45.9%, and IR 45.7%. Analyses of variance of this repeatability study showed that the differences between the GLC mean and both the theoretical value and the HPLC mean were small, but significant. Technical methyl parathion and 6 emulsifiable concentrates were analyzed in duplicate by each method. Variance calculations for each set of duplicates by each method indicate a high probability of difference in the methods. High results from the IR analysis are probably due to impurities in the technical material because analysis of the synthetic sample was satisfactory. The HPLC and GLC methods appear to be precise and will be studied collaboratively.

Collaborative Study of Gas-Liquid Chromatographic Method for Analysis of Microencapsulated Methyl Parathion Insecticide

1977 ◽  
Vol 60 (4) ◽  
pp. 862-864
Author(s):  
James J Karr
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Method ◽  
Methyl Parathion ◽  
Collaborative Study ◽  
Gas Liquid Chromatography ◽  
Flame Ionization ◽  
Extraction Step ◽  
Liquid Chromatographic Method ◽  
Liquid Chromatographic

Abstract Eleven laboratories collaboratively studied the assay of methyl parathion in 2 formulations of Penncap-M insecticide. The procedure includes a grinding and extraction step, followed by the determination of methyl parathion by flame ionization gas-liquid chromatography. At the 15% level, the variance within laboratories was 0.0905, and among laboratories, 0.0755. At the 20% level, the figures were 0.0556 and 0.0205, respectively. The method has been adopted as official first action.

Confirmation of Pesticide Residue Identity. VIII. Organophosphorus Pesticides

1974 ◽  
Vol 57 (6) ◽  
pp. 1272-1278
Author(s):  
John A Coburn ◽  
Alfred S Y Chau
Keyword(s):  
Liquid Chromatography ◽  
Electron Capture ◽  
Potassium Hydroxide ◽  
Methyl Parathion ◽  
Organophosphorus Pesticides ◽  
Potassium Hydroxide Solution ◽  
Gas Liquid Chromatography ◽  
Flame Photometric Detector ◽  
Hydrolysis Products ◽  
Pentafluorobenzyl Bromide

Abstract A chemical confirmation for 5 organophosphorus pesticides is described. After extraction and quantitation by flame photometric detector gas-liquid chromatography (CLC), the organophosphorus pesticides are hydrolyzed in a 10% methanolic-potassium hydroxide solution, followed by derivatization with pentafluorobenzyl bromide to produce the pentafluorobenzyl (PFB) ethers of the phenolic hydrolysis products. The PFB ethers are subsequently fractionated on a silica gel microcolumn, and analyzed by electron capture GLC. The preliminary chromatographic results of the electron capture GLC analysis of the PFB ethers of the phenolic hydrolysis products of several N-methylcarbamates are also presented. As little as 0.01 ppb ronnel and crufomate and 0.10 ppb parathion, fenitrothion, and methyl parathion in a 1 L water sample can be confirmed.

Confirmation of Six Organothiophosphorus Pesticides by Chemical Derivatization at Nanogram Levels

1974 ◽  
Vol 57 (6) ◽  
pp. 1285-1287 ◽  
Author(s):  
Joginder Singh ◽  
Michel R Lapointe
Keyword(s):  
Liquid Chromatography ◽  
Sodium Hypochlorite ◽  
Methyl Parathion ◽  
Oxidation Products ◽  
Gas Liquid Chromatography ◽  
Sodium Hypochlorite Solution ◽  
Chemical Derivatization ◽  
Flame Photometric Detector ◽  
Hypochlorite Solution ◽  
Organothiophosphorus Compounds

Abstract A confirmatory procedure is described in which organothiophosphorus compounds are oxidized by neutralized sodium hypochlorite solution and the oxidation products are subjected to gas-liquid chromatography, using a flame photometric detector. Six pesticides, diazinon, ronnel, malathion, parathion, methyl parathion, and fenitrothion, were studied in 4 different substrates, peaches, blueberries, apples, and lettuce, at fortification levels of 0.25-0.5 ppm. These pesticides can be confirmed when present individually or in combination. Three pesticides, parathion, malathion, and diazinon, were shown to produce the corresponding oxons or oxygen analogs with retention times identical with the corresponding oxon reference standards.

Pesticide Residues in Total Diet Samples

1965 ◽  
Vol 48 (6) ◽  
pp. 1177-1180
Author(s):  
J G Cummings
Keyword(s):  
Liquid Chromatography ◽  
Thin Layer ◽  
Methyl Parathion ◽  
Gas Liquid Chromatography ◽  
Chlorinated Pesticides ◽  
Diet Sample ◽  
Market Basket ◽  
Total Diet ◽  
First Time ◽  
Layer Chromatography

Abstract Pesticide residue data are presented on a total diet sample, which was collected at Baltimore, Md. in May 1964. The analytical methods employed, which included electron capture and microcoulometric gas-liquid chromatography and thin layer chromatography, could detect more than 20 chlorinated pesticides, 7 herbicides, parathion, methyl parathion, carbaryl, and total bromides. The results parallel the findings on previous market basket samplings except that residues of the 2,4-D herbicide-type were detected for the first time.

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