Simple procedure for the determination of total carbon and its radioactivity in soils and plant materials

The Analyst ◽  
1979 ◽  
Vol 104 (1235) ◽  
pp. 151 ◽  
Author(s):  
R. C. Dalal
Keyword(s):  
Simple Procedure ◽  
Total Carbon ◽  
Plant Materials

scholarly journals Approximate determination of the cell-wall complex of vegetables by enzymatic digestion

1967 ◽  
Vol 39 (1) ◽  
pp. 38-43
Author(s):  
Maija-Liisa Salo ◽  
Kaija Kotilainen
Keyword(s):  
Cell Wall ◽  
Simple Procedure ◽  
Enzymatic Digestion ◽  
Uniform Method ◽  
Approximate Determination ◽  
Plant Materials ◽  
Buffer Solutions

The paper describes the results of experiments in which 12 different vegetables were treated with pepsin, trypsin or trypsin + diastase in buffer solutions. The effects of certain variations in the methods on the final results are also discussed. The purpose of the study was to find out whether it would be possible to develop a simple procedure that would yield a residue roughly corresponding to the cell-wall complex in readily soluble plant materials such as vegetables. However, such great differences were found in the solubility of hemicellulose and protein among the different materials that good results cannot be achieved by a uniform method, at least not without many correction determinations.

scholarly journals DETERMINATION OF TOTAL CARBON AND ITS RADIOACTIVITY

1955 ◽  
Vol 213 (2) ◽  
pp. 673-680
Author(s):  
F. Marott Sinex ◽  
John Plazin ◽  
D. Clareus ◽  
W. Bernstein ◽  
Donald D. Van Slyke ◽  
...  
Keyword(s):  
Total Carbon

Residue Analysis of Organophosphorus and Organochlorine Pesticides in Fatty Matrices by Gas Chromatography Coupled with Electron-Capture Detection

2006 ◽  
Vol 61 (5-6) ◽  
pp. 341-346 ◽  
Author(s):  
Jae-Woo Park ◽  
A. M. Abd El-Aty ◽  
Myoung-Heon Lee ◽  
Sung-Ok Song ◽  
Jae-Han Shim
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Simple Procedure ◽  
Linear Regression Analysis ◽  
Residue Analysis ◽  
Electron Capture Detection ◽  
Relative Standard ◽  
Wide Range ◽  
Repeatability And Reproducibility

A multiresidue method for the simultaneous determination of 22 organochlorine (OCs) and organophosphorus (Ops) pesticides (including isomers and metabolites), representing a wide range of physicochemical properties, was developed in fatty matrices extracted from meat. Pesticides were extracted from samples with acetonitrile/n-hexane (v :v, 1:1). The analytical screening was performed by gas chromatography coupled with electron-capture detection (ECD). The identification of compounds was based on their retention time and on comparison of the primary and secondary ions. The optimized method was validated by determining accuracy (recovery percentages), precision (repeatability and reproducibility), and sensitivity (detection and quantitation limits) from analyses of samples fortified at 38 to 300 ng/g levels. Correlation coefficients for the 22 extracted pesticide standard curves (linear regression analysis, n = 3) ranged from 0.998 to 1.000. Recovery studies from 2 g samples fortified at 3 levels demonstrated that the GC-ECD method provides 64.4-96.0% recovery for all pesticides except 2,4′-DDE (44.6-50.4%), 4,4′-DDE (51.1-57.5%) and 2,4′-DDT (50.0-51.2%). Both repeatability and reproducibility relative standard deviation values were < 20% for all residues. Detection limits ranged from 0.31 to 1.27 ng/g and quantification limits were between 1.04 and 4.25 ng/g. The proposed analytical method may be used as a simple procedure in routine determinations of OCs and Ops in meat. It can also be applied to the determination of pesticide multi-residues in other animal products such as butter and milk.

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