Investigations on adsorption potentiometry. Part V. Derivative adsorption chronopotentiometry of beryllium(II)-4-((4-diethylamino-2-hydroxyphenyl)-azo)-5-hydroxy-naphthalene-2,7-disurphonic acid system
Journal Article
·
· Analytical Letters; (United States)
OSTI ID:7004608
- Shandong Univ. (China)
An electroanalytical method, based on derivative chronopotentiometry of the complex of beryllium(II) with 4-((4-diethylamino-2-hydroxypheny)-azo)-5-hydroxy-naphthalene-2,7-disurphonic acid (Beryllon II) accumulated adsorptively on the surface of a hanging mercury drop electrode, has been developed for determining trace beryllium in food. The dependences of the peak height on the dt/dE vs. E curve on the preconcentration time, preconcentration potential and the constant reducing current are discussed. In 0.15 mol/l NH{sub 3} + 0.05 mol/l NH{sub 4}Cl, 4 {times} 10{sup {minus}7} mol/l Beryllon II, and at a preconcentration potential of {minus}0.30 V (vs. SCE), the limit of detection and linear range are 1 {times} 10{sup {minus}10} mol/l and 3 {times} 10{sup {minus}10}-2 {times} 10{sup {minus}7} mol/l, respectively. The relative standard error of the method is 2.3% for 6 {times} 10{sup {minus}8} mol/l Be(II). The method was applied to samples of food. The electrode process has been discussed.
- OSTI ID:
- 7004608
- Journal Information:
- Analytical Letters; (United States), Journal Name: Analytical Letters; (United States) Vol. 25:9; ISSN ANALB; ISSN 0003-2719
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ADSORPTION
ALKALINE EARTH METALS
BERYLLIUM
CHEMICAL ANALYSIS
ELEMENTS
FOOD
FOOD CHAINS
METALS
POTENTIOMETRY
QUANTITATIVE CHEMICAL ANALYSIS
SORPTION
TITRATION
TRACE AMOUNTS
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ADSORPTION
ALKALINE EARTH METALS
BERYLLIUM
CHEMICAL ANALYSIS
ELEMENTS
FOOD
FOOD CHAINS
METALS
POTENTIOMETRY
QUANTITATIVE CHEMICAL ANALYSIS
SORPTION
TITRATION
TRACE AMOUNTS