Pyridoxal 5′-phosphate assay based on lucigenin chemiluminescence
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Lucigenin
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A new sensitive and selective method for determination of trace antimony in water samples is proposed.It is based on the oxidation of Sb(Ⅲ) by K 2Cr 2O 7 in the alkaline medium and chemiluminescence reaction of luminol H 2O 2 with Cr(Ⅲ),combined with flow injection system and sulfhydryl cotton to separate antimony from other ions. The linear range for the determination of Sb(Ⅱ) is 0 1～100 μg/L with detection limit of 0 03 μg/L. The relative standard deviation is 2 0% for 11 measurements of 1 0 μg/L Sb(Ⅲ) standard solution. This method was used for the determination of trace antimony in environmental water samples with satisfactory results.
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A new simple, rapid, selective and sensitive analytical procedure based on chemiluminescence (CL) detection is described for the determination of free fluoride at sub‐nanogram levels by use of controlled‐reagent‐release technology in a flow injection system. The analytical reagents involved in the CL reaction, including luminol and periodate, were both immobilized on anion‐exchange resins in a flow injection system. Through water injection luminol and periodate were eluted from the anion exchange column to generate the chemiluminescence, which was enhanced in the presence of fluoride. The increased CL intensity was linear with fluoride concentration in the range from 0.1 to 10 ng·mL− 1. The limit of detection was 20 pg·mL− 1 (3σ) and the relative standard deviation (RSD) was 1.02% (n = 5) for a 1.0 ng·mL− 1 fluoride. At a flow rate of 2.0 mL·min− 1, including sampling and washing, a typical analytical procedure could be performed in 0.5 min with a RSD of less than 3.0%. The proposed method was successfully applied to determine the free fluoride in water and human urine, and the results were in good agreement with those obtained by ion chromatography.
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Potassium periodate
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The chemiluminescence analytical method for determination of cyanide in water was established based on flow injection analysis and Luminol-Cu 2+-CN - chemiluminescence system.The method is sensitive,accurate and rapid with detection limit of 0.0004μg/mL and linear range of 0.002μg/mL,and was applied to the determination of trace cyanide in natural river and waste waters.
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A new method for the determination of micronomicin with flow injection chemiluminescence was described. It was based on the chemiluminescence during the oxidation of micronomicin by N-bromosuccinimide (NBS) in alkaline medium in the presence of fluorescein as energy transfer. This method was sensitive, simple, rapid and reproducible. The linear range for micronomicin was 0.5～100 μg·mL~(-1 )with the relative standard deviation of 1.8% (c=5.0 μg·mL~(-1), n=11). The detection limit (3σ) was (0.08) μg·mL~(-1). The recommended method has been successfully used for the analysis of commercial formulation with satisfactory results.
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Tap water
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