Evaluation and Expression of Uncertainty in the Determination of Alumina in Deodorants Using Complexometric Method

2009 ◽  
Vol 37 (4) ◽  
pp. 101507
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Nijhuma Kayal ◽  
Nahar Singh ◽  
V. N. Ojha ◽  
...  
Keyword(s):  
Complexometric Method ◽  
Expression Of Uncertainty

Determination of aluminium in iron ore and iron ore sinter by a complexometric method

The Analyst ◽  
1976 ◽  
Vol 101 (1204) ◽  
pp. 516 ◽  
Author(s):  
Samaresh Banerjee ◽  
R. K. Dutta
Keyword(s):  
Iron Ore ◽  
Complexometric Method ◽  
Iron Ore Sinter

scholarly journals An improvement of calcium determination technique in the shell of molluscs

2009 ◽  
Vol 52 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Cristiane Soído ◽  
Maurício Carvalho Vasconcellos ◽  
Antônia Gonçalves Diniz ◽  
Jairo Pinheiro
Keyword(s):  
Hydrogen Peroxide ◽  
Nitric Acid ◽  
Experimental Model ◽  
Calcium Content ◽  
Conventional Technique ◽  
Organic Substances ◽  
Complexometric Method ◽  
Wet Weight ◽  
Calcium Determination

The complexometric method is usually applied to quantitative calcium determination in different materials; however the application of this method to calcium determination in molluscs shells infers significant interferences to the results. The snail Bradybaena similaris, a terrestrial gastropod, was used as experimental model to the improvement of this method. The shells were calcinated and dissolved in nitric acid, the hydrogen peroxide was also used to clarify the medium after the acid addition. The calcination procedure and the use of nitric acid reduced the significantly the interferences, allowing a major degree of destruction of the organic substances of the shell. The improvement of the calcium determination technique usually employed showed calcium content of 874.24 ± 56.617 mg of CaCO3/g of ash in comparison to the conventional technique that allowed the determination of 607.79 ± 67.751 mg of CaCO3/g of shell, wet weight.

ANALYSIS FOR SMALL AMOUNTS OF CALCIUM, MAGNESIUM, BARIUM, AND SULPHATE USING PHTHALEIN PURPLE

1956 ◽  
Vol 34 (7) ◽  
pp. 921-925 ◽  
Author(s):  
J. R. McCallum
Keyword(s):  
Cation Exchange ◽  
Distilled Water ◽  
Complexometric Method ◽  
Exchange Column ◽  
Cation Exchange Column ◽  
Calcium Magnesium

For the determination of sulphate ion in samples containing 3 to 20 mgm., it was found that the standard precipitation techniques did not give sufficiently accurate results, and were time consuming. Reference to the literature showed that with certain modifications a complexometric method proposed by Schwarzenbach etal. for samples containing 20 to 50 mgm. of sulphate was most likely to give accurate results rapidly. In this method the sample is passed through a cation exchange column and washed with distilled water into a flask. This solution is boiled and precipitated with excess standard disodium ethylenediaminetetracetate in the presence of alcohol and ammonia using phthalein purple indicator. Provided that the details of procedure described in this paper are closely adhered to, accuracy is usually within two per cent. Calcium, magnesium, and barium may also be titrated directly using the phthalein purple indicator.

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