Kolorimetrische Bestimmung kleinster Mengen Schwefel

Roth, Hubert

doi:10.1007/bf01427458

Cited by 38 publications

(3 citation statements)

References 6 publications

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“…Calculate the normality of the thiosulfate solution. PROCEDURE Oxidize from 0.3 to 0.8 gram of sample, depending on sulfur content, in an oxygen bomb and prepare the sulfur solution according to ASTM method D 129 (7). Collect the sulfur solution by thorough, but not excessive, washing of the bomb, and hydrochloric acid treatment of the sample cup if an ash remains.…”

Section: Apparatusmentioning

confidence: 99%

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Bomb-Volumetric Method for Sulfur in Refined Petroleum Products

Kreider¹,

Foulds²

1954

Anal. Chem.

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The bomb-gravimetric procedure for sulfur is too lengthy to be considered a rapid control method. A bomb-volumetric procedure has been developed for refined petroleum products which can be performed in 2 hours. The method involves the hydriodic acid reduction of sulfate and the iodometric titration of the resultant sulfide in an improved manner. Phosphorus presents no difficulty as it does in most other volumetric methods. The method is not applicable to oils containing barium, selenium, or nitrogen in significant amounts.Accuracy is ±2%, which is believed to be an advantage of the method. THE bomb-gravimetric method for sulfur in petroleum products (1) involves decomposition of the sample in an oxygen bomb, followed by gravimetric determination of the sulfate as barium sulfate. The primary disadvantage of the method is the gravimetric determination which makes the method longer than desirable for rapid control testing. Another disadvantage is the well-known contamination of the barium sulfate precipitate. Volumetric procedures for sulfur have been reported (5, 9, 10), but are subject to interference from phosphorus.

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Section: Apparatusmentioning

confidence: 99%

“…Colorimetric procedures (7,8) and volumetric procedures (3,4,6) for sulfur have been described using the hydriodic acid reduction of sulfate. For the analysis of lubricating oil additives in particular, a volumetric method was desired.…”

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confidence: 99%

Bomb-Volumetric Method for Sulfur in Refined Petroleum Products

Kreider¹,

Foulds²

1954

Anal. Chem.

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“…Fischer and Sprague ( 19) also employed conductometric titration to determine sulfate, but employed benzidine dilwdrochloride as titrant. Roth (92) determined traces of sulfur in organic materials by oxidizing to sulfate, reducing the latter by7 hydriodic-formic acid mixture to hydrogen sulfide, which is used to form methylene blue, and this is determined photometrically. Sands et al ( 95) used a turbidimetric method to determine barium sulfate equivalent to the organic sulfur in symthesis gas.…”

Section: Sulfur and Its Compoundsmentioning

confidence: 99%

Petroleum

Levin¹

1952

Anal. Chem.

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ANALYTICAL CHEMISTRY continues to be an important il.factor contributing to progress in the field of petroleum. This is adequately illustrated in this review, which is concerned with the literature for approximately one year from that covered in the previous review (60). CRUDE OILThe Institute of Petroleum (44) studied the principles involved in the laboratory evaluation of crude oil. Morgan and Turner (71) concluded, from a study with iron, calcium, and sodium as radiochemical tracers, that if combustion is carefully controlled at ignition temperatures not exceeding 550°C ., ash corresponding to quantitative recovery of metallic constituents of petroleum oil is obtained.

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Zur Kenntnis des Viscotoxins

Winterfeld

1956

Archiv der Pharmazie

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Kolorimetrische Bestimmung kleinster Mengen Schwefel

Cited by 38 publications

References 6 publications

Bomb-Volumetric Method for Sulfur in Refined Petroleum Products

Bomb-Volumetric Method for Sulfur in Refined Petroleum Products

Petroleum

Zur Kenntnis des Viscotoxins

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