Method for determining volatile phosphorus in carbon

Details Method for determining volatile phosphorus in carbon Method for determining volatile phosphorus in carbon

1987-11-05

1989-06-27

Richman, Barry S.

Chemistry: analytical and immunological testing

Phosphorus containing

422 80, 436155, 436164, G01N 3112, G01N 3300

Patent

active

048430153

ABSTRACT:
A method and apparatus for determining the phosphorus content which can be volatilized in a solid carbon sample. The sample is heated in the presence of steam to produce a vaporous steam containing volatile phosphorus. Next, the vaporous stream is passed through a zinc oxide layer whereby the voliatle phosphorus is retained. A colored solution is formed upon adding to the zinc oxide layer a vanadate-molybdate reagent. Finnally, the intensity of the colored solution is determined by a spectrophotometer; and the phosphorus content is determined by comparison with a standard intensity graph.

REFERENCES:
patent: 3425805 (1969-02-01), Grobin
patent: 3796543 (1974-03-01), Kamphake
patent: 3847554 (1974-11-01), Su
patent: 4419328 (1983-12-01), Walsh
patent: 4473651 (1984-09-01), Goldstein
patent: 4533639 (1985-08-01), Kojima et al.
patent: 4599316 (1986-07-01), Hahn et al.
patent: 4627910 (1986-12-01), Millman

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