Standard rapid field test for trace lead in unleaded gasoline (colorimetric method)

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Annu. Book ASTM Stand.; (United States)

OSTI ID:7069725

A method is described for the quantitative measurement of lead in unleaded gasoline in the range from 0.01 to 0.10 g Pb/U.S. gal (2.64 to 26.4 mg Pb/litre). The method is applicable to all commercial gasolines and responds to all types of lead alkyls as well as to other organic and inorganic forms of lead. The gasoline is treated with iodine and tetraethyl ammonium chloride in chloroform and subjected to ultraviolet light. The lead alkyls form water-soluble lead alkyl iodides, which are removed from the gasoline by shaking it with an aqueous ammonium nitrate solution. The aqueous extract is filtered into a solution of 4-(2-pyridylazo)-resorcinol disodium salt (PAR) and ammonium hydroxide. The lead is determined by measuring its PAR complex colorimetrically at 490 nm using a previously prepared calibration curve.

• OSTI ID: 7069725
• Journal Information: Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 25; ISSN ASTSA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
023000* -- Petroleum-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
ABSORPTION SPECTROSCOPY
CHEMICAL ANALYSIS
ELEMENTS
FUELS
GASOLINE
LEAD
LEAD COMPOUNDS
LIQUID FUELS
METALS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PETROLEUM PRODUCTS
QUANTITATIVE CHEMICAL ANALYSIS
SPECTROSCOPY
STANDARDS
TEL