scholarly journals Application of Volhard Titration to 2-Ethyl-1Hexanol Separation Method for Determination of Lithium

1955 ◽  
Vol 27 (7) ◽  
pp. 1188-1189 ◽  
Author(s):  
J. C. White ◽  
Gerald Goldberg
Keyword(s):  
Separation Method

DETERMINATION OF BOTANICAL COMPOSITION OF TWO-COMPONENT FORAGE MIXTURES

1960 ◽  
Vol 40 (2) ◽  
pp. 225-234 ◽  
Author(s):  
J. W. Tanner ◽  
E. E. Gamble ◽  
W. E. Tossell
Keyword(s):  
Unit Cost ◽  
Estimation Method ◽  
Separation Method ◽  
Botanical Composition ◽  
Visual Estimation ◽  
Two Component ◽  
Late Maturity ◽  
The Difference ◽  
Forage Mixtures

A comparative study was made in 1958 of the visual estimation and hand separation methods of determining botanical composition of two-component forage mixtures. The results indicated that there were positive significant correlations between the per cent legume values obtained by the two methods. The visual estimation method was less variable than the hand separation method and the precision per unit cost was greater. The differences between per cent legume values obtained by the two methods were influenced by the stage of maturity (medium or late hay) of the components and the cut (hay or aftermath). In this study, the difference was significant only in the medium aftermath cut.Individually, three observers showed some inconsistencies between estimates on the medium and late maturity groups and between the hay and aftermath cut. However, by averaging the three estimates to obtain a mean sample, these inconsistencies were minimized.Both methods were more precise in the aftermath pasture cut than in the hay. An additional observer increased precision of the visual estimate more than an additional replicate or sample. The greater precision resulting from additional replicates, samples, or observers increased at a decreasing rate. The number of replicates, samples, and observers required for specific degrees of precision and a specific cost were calculated.The experiment showed that the visual estimation method can be superior to the hand separation method as a means of determining botanical composition.

Determination of low 137Cs concentration in seawater using ammonium 12-molybdophosphate adsorption and chemical separation method

2008 ◽  
Vol 99 (12) ◽  
pp. 1815-1818 ◽  
Author(s):  
J.H. Park ◽  
B.U. Chang ◽  
Y.J. Kim ◽  
J.S. Seo ◽  
S.W. Choi ◽  
...  
Keyword(s):  
Chemical Separation ◽  
Separation Method ◽  
137Cs Concentration

scholarly journals Determination of Trace Amounts of Bismuth in Steel by ICP-MS Through a Cascade-preconcentration and Separation Method

2015 ◽  
Vol 55 (1) ◽  
pp. 332-334 ◽  
Author(s):  
Gen Okano ◽  
Shukuro Igarashi ◽  
Osamu Ohno ◽  
Yuhei Yamamoto ◽  
Shotaro Saito ◽  
...  
Keyword(s):  
Separation Method ◽  
Icp Ms

Separation and Determination of Trace Amounts of Tin Present as Organotin Residues on Fruits

1970 ◽  
Vol 53 (1) ◽  
pp. 140-146
Author(s):  
Homer B Corbin
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Extraction Method ◽  
Colorimetric Method ◽  
Separation Method ◽  
Measuring System ◽  
Accuracy And Precision ◽  
Spray Treatment

Abstract The dithiol colorimetric method has been applied to the determination of trace amounts of tin as residues from the spray treatment of fruit with a miticide containing tricyclohexyltin hydroxide. The samples are prepared by an initial wet combustion to give a sulfuric acid solution of tin in the inorganic form. The tin is separated from other elements in the acid digest by one of two methods. One involves distillation of stannic bromide with a mixture of HBr and HCl. In the second separation method stannic iodide is extracted into n-hexane. Both separation procedures result in a solution of tin in a few milliliters of concentrated H2SO4, which is then measured spectrophotometrically. Data are presented for sensitivity and precision of the measuring system; accuracy and precision of both separation methods are illustrated by duplicate analyses and recovery tests on apples and pears treated with various cyclohexyltin compounds and inorganic tin. The extraction method has been tested for compatibility with 35 elements. Only arsenic (>0.15 mg or 1.5 ppm) and antimony (>2 mg or 20 ppm) are likely to interfere. Procedures are given for elimination of greater amounts of these elements.

Analysis of Force Components in Bar Turning

1973 ◽  
Vol 95 (4) ◽  
pp. 960-964
Author(s):  
A. B. Husein ◽  
M. F. DeVries ◽  
S. M. Wu
Keyword(s):  
Separation Method ◽  
Equilibrium Equations ◽  
Oblique Cutting ◽  
Contact Surfaces ◽  
Force Components ◽  
Bar Turning

This paper presents the development of equilibrium equations permitting the determination of the force components at each of the chip-tool-workpiece contact surfaces in bar turning. The analysis is an extension of the force separation method developed for the oblique cutting of tubes. The solution presented is applicable to both bar and tube cutting and was experimentally evaluated. The bar turning data produced solutions that compared favorably with tube turning data obtained.

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