Differential pulse polarographic determination of molybdenum at parts-per-billion levels

Differential pulse polarographic determination of molybdenum at parts-per-billion levels

A new method for the determination of molybdenum at trace levels has been developed, which is based on the electrochemical reduction of dioxobis(8-quinolinolato)molybdenum(VI). The complex is formed and extracted from the sample matrix into chloroform prior to its reduction at -1.08 V vs. SCE in dim...

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Veröffentlicht in:Anal. Chem.; (United States) 1978-08, Vol.50 (9), p.1300-1303
Hauptverfasser: Bosserman, Paula, Sawyer, Donald T, Page, Albert L
Format: Artikel
Sprache:eng
Schlagworte:
ACCURACY
ACETIC ACID
ALFALFA
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
ELEMENTS
EXTRACTION
GRASS
HALOGENATED ALIPHATIC HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LEGUMINOSAE
METALS
MOLYBDENUM
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLANTS
POLAROGRAPHY
QUANTITATIVE CHEMICAL ANALYSIS
QUANTITY RATIO
REFRACTORY METALS
SAMPLE PREPARATION
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENTS
TRACE AMOUNTS
TRANSITION ELEMENTS 400102 > Chemical & Spectral Procedures
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Zusammenfassung:A new method for the determination of molybdenum at trace levels has been developed, which is based on the electrochemical reduction of dioxobis(8-quinolinolato)molybdenum(VI). The complex is formed and extracted from the sample matrix into chloroform prior to its reduction at -1.08 V vs. SCE in dimethyl formamide. Only tungsten co-extracts and it does not interfere with the analysis. A linear calibration curve is obtained for the concentration range from 0.1 ..mu..M (9.6 ppB) to 100 ..mu..M (9.6 ppM). The method has been applied to plant samples that have been grown on fly-ash amended soils. 3 figures, 2 tables.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac50031a027