Fungicide Residues, Extraction and Determination of 2,6-Dichloro-4-nitroaniline in Processed Fruits

Pesticide Residue Analysis. Gas Chromatographic Analysis of 2,6‐Dichloro‐4‐nitroaniline

“…The residue values shown are in agreement with the data obtained by Kilgore et al (1962) on the same samples. Other confirmatory data were obtained in the method development, using portions of the samples prepared for analysis by Kilgore et al in development of their method.…”

“…Fruit or syrup is prepared for analysis by extraction as described by Kilgore et al (1962). A loo-ml portion of a sample representing 50 g of fruit or 25 g of syrup is put on a 2.5 X Z-cm column containing 25 g of Florisil previously rinsed with SO ml of benzene.…”

“…The extraction and cleanup procedures described by Kilgore et al (1962) were tested and found to remove all extractives from canned peaches and apricots that would cause 'any interference in the gas chromatographic analysis of dicloran. It was also determined that the extracts of syrup need ohly to be concentrated for gas chromatographic analysis, thus eliminating the need for the Florisil cleanup step.…”

“…The availability of alternate methods is often important to pesticide residue chemists. A previous paper from this laboratory (Kilgore et al, 1962) described a calorimetric method of analysis for the determination of 2,6-dichloro-4-nitroaniline (dicloran) in processed fruits.…”

Determination of 2,6‐dichloro‐4‐nitroaniline Residues in Fruits by Electron‐Capture Gas Chromatography

“…The analytical procedure originally developed by Kilgore et al (1962) for the extraction and determination of DCNA residues in canned fruits has been used extensively for both processed and unprocessed samples.…”