Determination of Organic Sulfur in Gas

Direct Determination of Sulfur

“…The usual procedure (3,11) has been to oxidize the elemental sulfur to sulfate, which is then precipitated and weighed as barium sulfate. The gravimetric method is so time-consuming that various volumetric (6,8,13,14) and photometric (IS) procedures for the estimation of sulfate ion have been proposed. However, for work with spray residues, the oxidation itself requires a considerable amount of time, no matter whether the sulfur is first extracted from the plant material (11) or the whole sample is oxidized in an alkaline fusion (1).…”

Direct Titration Method for Determination of Barium

“…A considerable amount of experimental work on the direct titration of sulfate with standard barium chloride has been carried out (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Schroeder (6) first proposed direct titration for the determination of sulfate using tetrahydroxyquinone as an internal indicator.…”

Determination of Sulfur after Combustion in Small Oxygen Bomb. Rapid Trimetric Method

“…gen {12, 19, 28, 32,40), combustion in a lamp with air {4, 6, 43), fusion in a crucible with sodium carbonate or Eschka's mixture (3,7,9), fusion in a bomb with sodium peroxide (3,13,28,30), and combustion in a bomb with oxygen under pressure {5, 35) are extensively used. Reduction methods, such as catalytic hydrogenation {16, 17, 41, 43), have been less widely used. A few investigators have combined oxidation and reduction {22, 25,37).…”