Trace lead analysis method

Details Trace lead analysis method Trace lead analysis method

1974-02-19

1976-01-27

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

23230HC, 23230M, G01N 3122, G01N 3320, G01N 3322

Patent

active

039349764

ABSTRACT:
The lead content of gasolines, particularly in concentrations of from 0.00 to 0.10 gram of lead per U.S. gallon of gasoline, is determined colorimetrically by mixing iodine and tetraorganoammonium halide solution with the gasoline, subjecting the mixture to ultraviolet light or heat, agiating the mixture with ammonium nitrate or nitric acid, passing the aqueous phase into 4-(2-pyridylazo)-resorcinol disodium and comparing the resulting color with a standard color scale or a colorimeter to determine the initial lead concentration.

REFERENCES:
patent: 3806319 (1974-04-01), Fabbro et al.
Daniels et al., Physical Chemistry, Third Edition, p. 621, (1966), John Wiley & sons Inc., N.Y.
Pollard et al., "4-(2 Pyridylazo)-Resorcinol Asa Possible Analytical Reagent for the Colorimetric Est. of Cobatt, Lead, and Uranium." 20 Anal. Chim. Acta 26-31, 1959.
Mapstone, "A Qualitative Test for Tel in Gasoline," 42 Journal Inst. petrol. 67, 1956.
Webster's 3d New Int'l Dictionary, unabridged, p. 333, 1966.

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