Growth Regulator Residues, Determination of N-m-Tolyl Phthalamic Acid Residues in Food Crops

1958 ◽  
Vol 6 (10) ◽  
pp. 753-754 ◽  
Author(s):  
J. R. Lane ◽  
D. K. Gullstrom ◽  
J. E. Newell
Keyword(s):  
Growth Regulator ◽  
Food Crops ◽  
Phthalamic Acid ◽  
Residues Determination

Gas-Liquid Chromatographic Determination of Technical Chlordane Residues in Food Crops: Interpretation of Analytical Data

1975 ◽  
Vol 58 (5) ◽  
pp. 1051-1061
Author(s):  
William P Cochrane ◽  
James F Lawrence ◽  
Young W Lee ◽  
Ronald B Maybury ◽  
Brian P Wilson
Keyword(s):  
Field Experiments ◽  
Stationary Phases ◽  
Analytical Data ◽  
Chromatographic Determination ◽  
Electron Capture Detection ◽  
Food Crops ◽  
Liquid Chromatographic Determination ◽  
Consistent Method ◽  
Liquid Chromatographic

Abstract An interlaboratory investigation of technical chlordane residues in food crops was carried out to determine the most practical and consistent method of reporting results. Using a technical chlordane reference standard, 8 gas chromatographic stationary phases were studied for their resolution capabilities. The best separations were obtained with SE-30 and its OV-1 equivalent. Using these columns and electron capture detection, potatoes and carrots from supervised field experiments were analyzed in duplicate and quantitated by using 4 methods of calculation. The data were statistically treated to determine the precision and bias for each method. Also, 1 sample was analyzed in duplicate on 2 different occasions by 6 laboratories to substantiate the initial conclusions. Based on the criterion of high precision it is suggested that a comparison of total area under the chromatogram of the sample with total area of a standard technical chlordane be the method of quantitation. Only peaks which are common to both standard and sample have any significance in this type of calculation.

Collaborative Study of Maleic Hydrazide Residue Analysis

1965 ◽  
Vol 48 (4) ◽  
pp. 744-748
Author(s):  
J R Lane
Keyword(s):  
Maleic Hydrazide ◽  
Residue Analysis ◽  
Collaborative Study ◽  
French Fries ◽  
Food Crops ◽  
Good Reproducibility ◽  
Processed Food ◽  
Wide Range ◽  
Single Determination

Abstract The recoveries obtained from raw and processed food crops fortified with 10 μg or more of maleic hydrazide per analytical sample demonstrate that a wide range of concentrations of maleic hydrazide residues can be accurately determined. The test shows good reproducibility and agreement of data, considering the additional possible error of a blending at point of origin and reblending upon receipt by the collaborator, the lack of refrigeration, and the use of a single determination of the unknowns. The crops used included cranberries, onions, peaches, tobacco dust, and potatoes (whole, dehydrated mashed, frozen french fries, and potato chips). The average recoveries on these crops, fortified with 1.3–85 ppm, ranged from 70 to 92%.

Automated Sample Cleanup for Pesticide Multiresidue Determination. I. Evaluation of Solvent Partitioning Module

1984 ◽  
Vol 67 (1) ◽  
pp. 108-111
Author(s):  
Fred M Gretch ◽  
Joseph D Rosen
Keyword(s):  
Cost Effectiveness ◽  
Column Chromatography ◽  
Continuous Flow ◽  
Flow System ◽  
Food Crops ◽  
System Data ◽  
The Cost ◽  
Automated Procedures ◽  
Multiresidue Determination

Abstract An automated continuous flow procedure is described that improves the cost effectiveness and precision of AOAC methodology for multiresidue pesticide determinations in nonfatty foods. Individual modules capable of performing automated solvent partitioning and automated column chromatography were constructed and integrated into a continuous flow system. Data are presented comparing the recoveries and precision for the determination of 8 pesticides (aldrin, dieldrin, p,p’ - DDT, ethion, heptachlor epoxide, lindane, parathion, and ronnel) partitioned from 2 food crops (spinach and tomatoes) by both the manual and automated procedures.

Determination of 2-Chloroethylphosphonic Acid in Apples, Cherries, Onions, and Pineapple Pulp

1970 ◽  
Vol 53 (4) ◽  
pp. 730-732
Author(s):  
Carl A Bache
Keyword(s):  
Gas Chromatography ◽  
Growth Regulator ◽  
Pineapple Pulp

Abstract A method for the determination of the growth regulator, 2-chloroethylphosphonic acid in apples, cherries, onions, and pineapple pulp is described. The samples are mascerated and extracted with methanol. The residue is methylated under acid conditions and analyzed by gas chromatography with a alkali thermionic detector. Recovery data are presented at 0.1 and 0.12 ppm. The method is sensitive to about 0.05 ppm.

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