DETERMINATION OF TRACES OF URANIUM WITH 1-(2-PYRIDYLAZO)-2-NAPHTHOL

Journal Article · Sun Jun 01 04:00:00 EDT 1958 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

DOI:https://doi.org/10.1021/ac60138a004· OSTI ID:4327674

Cheng, K L

1-(2-Pyridylazo)-2-naphthol reacts with many polyvalent metals, forming intensely colored complexes. However, in the presence of strong complexing agents, such as (ethylenedinitrilo)tetraacetic acid and cyanide, it reacts only with uranium to form a deep red finely divided precipitate in ammoniacal solutions. The naphthol complex can be exracted by o-dichlorobenzene and has its maximum absorption at 570 m mu . The color is stable and follows Beer's law over the range of 0.1 to 5 a 10/sup -4/ mmole of uranium in 10 nd of the solvent. The molar absorptivity of 1-(2-pyridylazo)-2-naphthol is 23,000; therefore, it may be the most sensitive color reagent for uranium. Trace amounts of uranium may be determined in the presence of many metals without prior separation. (auth)

• Research Organization: Westinghouse Electric Corp., East Pittsburgh
• Sponsoring Organization: USDOE
• NSA Number: NSA-12-009696
• OSTI ID: 4327674
• Journal Information: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Journal Name: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed. Vol. Vol: 30; ISSN ANCHA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
AMMONIA
CHEMICAL REACTIONS
CHEMISTRY
CHLORINATED HYDROCARBONS
COLOR
COMPLEXES
CYANIDES
EFFICIENCY
EQUATIONS
METALS
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
QUANTITY RATIO
SOLUTIONS
SOLVENT EXTRACTION
TRACE AMOUNTS
URANIUM