US EPA

1751371 

Journal Article 

Mass Spectrometric Study Of The Species CS, SO, And CCl2 Produced In Primary Heterogeneous Reactions 

Blanchard, LP; Le Goff, P 

1957 

Yes 

Canadian Journal of Chemistry
ISSN: 0008-4042
EISSN: 1480-3291 

NIOSH/00133453 

35 

89-98 

The reactions of carbon-disulfide (75150) (CS2), hydrogen-sulfide (7783064) (H2S), sulfur-dioxide (7446095) (SO2), and carbon-tetrachloride (56235) (CCl4) on pure tungsten (7440337) ribbons were studied at 1300 to 2000 degrees-K. The vapor of the sample material at a pressure of 0.00001 millimeters of mercury was pumped through a reaction chamber at a rate of 5 liters per second. The vapor then reacted with a tungsten ribbon that was mounted in the chamber. The reactants and products were analyzed by a mass spectrometer, the ionization chamber of which formed an integral part of the reaction vessel. In the decomposition of CS2, the parent peak, mass 76, decreased above 1400 degrees. Mass 44 and mass 64 intensities increased above 1400 degrees while that of mass 32 remained constant. The decomposition of H2S on pure tungsten produced decreasing ion intensities of mass 33 and 34 above 1500 degrees. On pure tungsten, the decomposition of SO2 showed a decrease in the appearance potential of mass 64 between 1300 and 1900 degrees. Increases in the intensities of mass 35 and 70 were seen during the decomposition of CCl4. The authors conclude that on pure tungsten ribbon, the decompositions of CS2 to carbon-sulfide (2944050) and sulfur (7704349), H2S to hydrogen (1333740) and sulfur, SO2 to oxygen (7782447) and sulfur-monoxide (13827322), and CCl4 to carbon-dichloride (1605727), chlorine (7782505), and chloride (16887006) occur. 

DCN-122795; Analytical methods; Analytical chemistry; Pyrolysis; Mass spectrometry; Physical properties; Chemical properties; Testing equipment; Laboratory testing; Heat exposure