Determination of VC-13 Nemacide Residues on Crops

1964 ◽  
Vol 47 (2) ◽  
pp. 287-288
Author(s):  
John I Teasley
Keyword(s):  
Alkaline Hydrolysis ◽  
Collaborative Study ◽  
Potassium Ferricyanide ◽  
Hydrolysis Of

Abstract A collaborative study was made of a method for the determination of VC-13 Nemacide residues, based on the alkaline hydrolysis of the pesticide to produce 2,4-dichlorophenol, which is measured colorimetrically with 4-aminoantipyrine and potassium ferricyanide. Results indicate that cleanup technique is critical and not effective for some crops. Several changes in the method were recommended for the next study. Three of five collaborators obtained satisfactory recoveries at levels of 50—250 ppb.

Determination of Sevin Insecticide Residues in Fruits and Vegetables

1963 ◽  
Vol 46 (2) ◽  
pp. 234-237 ◽  
Author(s):  
D P Johnson
Keyword(s):  
Alkaline Hydrolysis ◽  
Coupling Agent ◽  
Fruits And Vegetables ◽  
Collaborative Study ◽  
Hydrolysis Product ◽  
Colorimetric Determination ◽  
Insecticide Residues ◽  
Hydrolysis Of

Abstract Collaborative study was made of a method for Sevin, with apples and lettuce as test crops. The method is based on alkaline hydrolysis of Sevin and colorimetric determination of 1-naphthol, the hydrolysis product, with p-ni-trobenzenediazonium fluoborate as chromogenic coupling agent. Recoveries varied significantly among laboratories, types of crops, and level of insecticide. The method will be modified according to the collaborators’ suggestions, and the collaborative study will be repeated.

Determination of Sevin Insecticide Residues in Fruits and Vegetables

1964 ◽  
Vol 47 (2) ◽  
pp. 283-286
Author(s):  
D P Johnson
Keyword(s):  
Fruits And Vegetables ◽  
Collaborative Study ◽  
Colorimetric Determination ◽  
Average Recovery ◽  
Insecticide Residues ◽  
Chromogenic Agent ◽  
Hydrolysis Of ◽  
Concentration Levels ◽  
Good Agreement

Abstract Collaborative study of a method for Sevin insecticide residues was repeated with apples and lettuce as test crops. The method is based on alkaline hydrolysis of Sevin and colorimetric determination of the resulting 1-naphthol with p-nitrobenzenediazonium fluoborate as chromogenic agent. Data from 5 collaborators were in good agreement with an average recovery of 87.8% at 2 concentration levels. It is recommended that the method be adopted as official, first action.

Analysis of Chloroxuron Technical and Its Formulations: Collaborative Study

1978 ◽  
Vol 61 (6) ◽  
pp. 1499-1503
Author(s):  
Werner Heizler ◽  
Juerg Meier ◽  
Klaus Nowak ◽  
Rolf Suter ◽  
Hans P Bosshardt
Keyword(s):  
Thin Layer ◽  
Alkaline Hydrolysis ◽  
Collaborative Study ◽  
Acid Extraction ◽  
Wettable Powder ◽  
Good Repeatability ◽  
Aoac Method ◽  
Layer Chromatography ◽  
Hydrolysis Of ◽  
Good Agreement

Abstract Chloroxuron technical and its 50% wettable powder were analyzed by 17 participants in a CIPAC collaborative study. The analytical method used involves acid extraction to remove interfering free amines, followed by alkaline hydrolysis of the extraction residue, distillation, and titration of the liberated dimethylamine. Related byproducts which may interfere are determined by semiquantitative thin layer chromatography. Results obtained from 17 government and industrial collaborators showed good repeatability within laboratories. Good agreement was also achieved between laboratories. A reproducibility of about 1.5% was obtained. The method has been adopted as an interim official CIPAC-AOAC method.

scholarly journals Extractive Spectrophotometric Determination of Malathion in Environmental Samples Using Gention Violet

2005 ◽  
Vol 2 (3) ◽  
pp. 187-192 ◽  
Author(s):  
K. M. Reddy ◽  
K. Suvardhan ◽  
K. Suresh Kumar ◽  
D. Rekha ◽  
P. Chiranjeevi
Keyword(s):  
Spectrophotometric Method ◽  
Alkaline Hydrolysis ◽  
Environmental Samples ◽  
Sodium Ethoxide ◽  
Ion Pair ◽  
Soil Samples ◽  
Organic Layer ◽  
Cationic Dye ◽  
Hydrolysis Of

A new simple and selective spectrophotometric method is developed for the determination of malathion by using Gention violet is described. The method was based on the alkaline hydrolysis of malathion in presence of sodium ethoxide to form sodium dimethyl dithiophosphate (Na-DMDTP). The Na-DMDTP was formed as an ion-pair complex with cationic dye, gention violet. The ion-pair complex was extracted into chloroform. The color of the organic layer was measured at 587 nm. The method was applied to the determination of malathion residues in water, grain and soil samples

scholarly journals Determination of the Bond Ruptured in the Alkaline Hydrolysis of Vinyl Acetate.

1972 ◽  
Vol 26 ◽  
pp. 855-856 ◽  
Author(s):  
Erkki K. Euranto ◽  
Antero Alhoniemi ◽  
A. Kjekshus ◽  
A. F. Andresen ◽  
W. B. Pearson ◽  
...  
Keyword(s):  
Vinyl Acetate ◽  
Alkaline Hydrolysis ◽  
Hydrolysis Of

Determination of Available Lysine in Food Materials

1965 ◽  
Vol 48 (4) ◽  
pp. 858-859
Author(s):  
Carl M Lyman ◽  
M C Thomas
Keyword(s):  
Collaborative Study ◽  
Carbohydrate Content ◽  
Decomposition Products ◽  
High Carbohydrate ◽  
Available Lysine ◽  
Hydrolysis Of ◽  
Simpler Method

Abstract The major problems in the determination of available lysine in samples of high carbohydrate content are: (1) the destruction of e-dinitrophenyl lysine by carbohydrate decomposition products, and (2) the formation of interfering colored materials during hydrolysis of the samples. A procedure based on a modification of the Sanger reaction is described. Since this procedure is too involved and too intricate to be generally useful, collaborative study has been delayed and our efforts have been directed toward development of a simpler method.

scholarly journals Spectrophotometric Determination of Fenpropathrin and Fluvalinate in Their Formulations

1999 ◽  
Vol 82 (4) ◽  
pp. 785-791 ◽  
Author(s):  
Nutan Kaushik ◽  
Swadesh Kumar Handa
Keyword(s):  
Liquid Chromatography ◽  
Spectrophotometric Determination ◽  
Alkaline Hydrolysis ◽  
Cyanogen Bromide ◽  
Gas Liquid Chromatography ◽  
Colored Complex ◽  
Precise Method ◽  
Hydrolysis Of

Abstract An economical and precise method for spectrophotometric determination of fenpropathrin and fluvalinate pyrethroids is reported. The method involves alkaline hydrolysis of the pyrethroids to release HCN, which is converted to cyanogen bromide to form a colored complex with benzidine-pyridine reagent. This method can be used effectively to determine actual concentrations of these pyrethroids in their formulations. Results are comparable with results obtained by gas-liquid chromatography.

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