Catalytic quenching spectrofluorimetric determination of trace amounts of vanadium(V) based on its catalytic effect on the azomethine-H-bromate reaction

Journal Article · Thu Jul 01 04:00:00 EDT 1999 · Analytical Letters

DOI:https://doi.org/10.1080/00032719908542958· OSTI ID:679186

Gao, J; Zhang, X; Zhao, B; Yang, W; Zhao, Y; Teng, X; Kang, J ^[1]

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1. Northwest Normal Univ., Lanzhou (China). Inst. of Chemistry

A catalytic quenching spectrofluorimetric method for the determination of V(V) using azomethine-H as a luminescence reagent has been investigated due to the catalytic effect of V(V) ion on oxidation of azomethine-H by potassium bromate at pH 4.2 and 30 C. The reaction was monitored spectrofluorimetrically by measuring the decrease of fluorescence intensity of azomethine-H ({lambda}{sub ex} = 382nm, {lambda}{sub cm} = 422nm) after a fixed time (4 min) and used EDTA to stop the reaction. The fluorescence decrease varies linearly with the concentration of vanadium(V) in the range 5.0 {times} 10{sup {minus}4}-0.022 {micro}g mL{sup {minus}1} (SD = 0.00029 for 10 times measurements), and 0.025 --0.060 {micro}g mL{sup {minus}1} (SD = 0.00038 for 15 times measurements), respectively. The detection limit of the method was down to 6.914 {times} 10{sup {minus}5} {micro}g mL{sup {minus}1}. The effect of foreign ions was studied and the method was found free from interference except Fe{sup 3+}. The proposed method was successively applied to determine vanadium(V) in natural water.

• Sponsoring Organization: USDOE
• OSTI ID: 679186
• Journal Information: Analytical Letters, Journal Name: Analytical Letters Journal Issue: 10 Vol. 32; ISSN ANALBP; ISSN 0003-2719
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CALIBRATION
CATALYTIC EFFECTS
CHEMICAL ANALYSIS
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
FRESH WATER
POLLUTION CONTROL
VANADIUM