A Rapid Method for Determining Sulfur and Ash in Rubber by Ignition of the Rubber in Oxygen

1936 ◽  
Vol 9 (3) ◽  
pp. 492-495
Author(s):  
B. Kreps
Keyword(s):  
Rapid Method ◽  
Volumetric Method ◽  
Total Sulfur ◽  
Method Of Determination ◽  
A Current

Abstract 1. The rapid method of determination of total sulfur and ash by ignition of rubber in a current of oxygen is not less accurate than the method of Henriques. 2. The proposed method can be used with all kinds of rubber mixtures except those containing litharge. 3. In the analysis of mixtures containing barytes, all sulfur except that contained in barytes is determined. 4. The method is particularly useful in the determination of sulfur and ash in Resinites (Thiokol), and the sulfate can be determined by the volumetric method.

scholarly journals A New Volumetric Method of Determination of Ferrous Iron in Silicates. I

1950 ◽  
Vol 71 (2) ◽  
pp. 160-163 ◽  
Author(s):  
Masayoshi Ishibashi ◽  
Yuzuru Kusaka
Keyword(s):  
Ferrous Iron ◽  
Volumetric Method ◽  
Method Of Determination

Rapid Method of Determination of Sorption Isotherms and Water Apparent Diffusivity

1996 ◽  
Vol 14 (9) ◽  
pp. 2003-2023 ◽  
Author(s):  
J.M. Meot ◽  
J.J. Bimbenet ◽  
J. Abecassis
Keyword(s):  
Rapid Method ◽  
Sorption Isotherms ◽  
Method Of Determination

Rapid method of determination of oil and additive grades in wide-range varnish former (Dil instrument)

1977 ◽  
Vol 13 (5) ◽  
pp. 357-360
Author(s):  
K. K. Papok ◽  
V. A. Gladkikh ◽  
B. S. Zuseva ◽  
A. N. Zaitseva
Keyword(s):  
Rapid Method ◽  
Method Of Determination ◽  
Wide Range

The Rapid Semimicrovolumetric Determination of Sulfur in Natural and Synthetic Rubber Vulcanizates

1957 ◽  
Vol 30 (1) ◽  
pp. 354-361 ◽  
Author(s):  
Bella B. Bauminger
Keyword(s):  
Zinc Oxide ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Schematic Diagram ◽  
Total Sulfur ◽  
Synthetic Rubber ◽  
Combustion Apparatus ◽  
Mineral Fillers ◽  
A Current

Abstract In the first part, a modified form of combustion apparatus for sulfur analyses is described, and the principle of the method and the apparatus itself are illustrated by a schematic diagram. In the determination of sulfur in natural-rubber, Butyl-rubber, and Krylene mixtures which contain no mineral fillers such as barytes and whiting, 50 mg. of finely divided vulcanizate is covered with aluminum oxide, decomposed in a current of oxygen at 1000° C, and the sulfuric acid formed is determined gravimetrically. An analysis requires about 30 minutes. Differences between the analytical values obtained and the calculated values never amount to more than ±1 per cent. In the second part of the work, a newly developed procedure for the determination of total sulfur in rubber mixtures which contain barytes, lithopone, whiting, etc., is described. The sample is covered with a mixture of vanadium pentoxide and zinc oxide and is then decomposed in a current of oxygen at 1000° C Here too the sulfuric acid which is formed is titrated acidimetrically. An analysis requires about one hour. The final part of the work deals with a new method for the determination of sulfur in synthetic-rubber vulcanizates, such as Neoprene, Perbunan, Hypalon, etc. The sulfuric acid formed by their combustion is precipitated by a hydrochloric acid solution of 4-amino-4′-chlorobiphenyl, and titrated with sodium hydroxide. Zinc, chlorides, and nitrates have no disturbing effects on the reaction. The method was tested with vulcanizates of known compositions and was found to give satisfactory results.

Determination of Free Sulfur by Titration

1936 ◽  
Vol 9 (2) ◽  
pp. 318-321
Author(s):  
B. Faĭnberg
Keyword(s):  
Rapid Method ◽  
Recent Article ◽  
Method Of Determination ◽  
Preliminary Extraction ◽  
Free Sulfur

Abstract In a recent article on the “Iodometric Method of Determination of Free Sulfur” by Bolotnikov and Gurova (J. Rubber Ind. U. S. S. R., 10, 61 (1933); Rubber Chem. and Technology, 8, 87 (1935)), the authors described a rapid method for determining free sulfur in rubber without a preliminary extraction.

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