Static and Flow-Injection Voltammetric Determination of Periodate By Reduction At a Rotating Platinum Wire Electrode

WOS: A1994NV04200013A method for periodate determination was developed as a result of static and flow-injection voltammetric investigations where a rotating platinum wire electrode was employed. In the static system, 4.0 X 10(-5)-4.2 x 10(-4) M periodate could be determined in the cell in pH 7.0-7.5 phosphate buffer. In the flow-injection system, periodate solutions of 20-100 mu l were injected into the carrier stream of a phosphate buffer solution at pH 7.0. The flow rates were in the range of 1.0-1.7 ml min(-1). The peak currents were measured at -0.07 V against a saturated calomel electrode. The determination of periodate concentrations in the range 1.0 X 10(-5)-1.0 X 10(-4) M was possible with a throughput of 15-40 samples per hour

Fluorimetric determination of Ascorbic Acid in Vitamin C tablets using methylene blue

WOS: 000232679900007PubMed ID: 16204979In this study, a simple and sensitive fluorimetric method was described for the determination of Ascorbic Acid (AA). The procedure is based on the reaction between AA and Methylene Blue (MB). The fluorescence intensity of NIB was measured at excitation and emission of 664 and 682 nm, respectively. MB concentration was decreased as a function of decreasing fluorescence intensity due to forming colorless form of MB (Leuco-MB) in the reaction between AA and NIB. A linear relationship was obtained between the decreasing fluorescence intensity and the concentration of AA in the range of 3.0x10(-7)-6.0x10(-6) mol(.)l(-1). The detection limit was 2.5x10(-7) mol(.)l(-1). The proposed method was applied successfully for the determination of AA in Vitamin C tablets

Long-term erythropoietin therapy in children with thalassemia major.

WOS: 00017213420008

Alternate use of deferiprone and desferrioxamine in primary school children with thalassaemia major

WOS: 000081618500042PubMed ID: 1044419

A novel silver recovery method from waste photographic films with NaOH stripping

WOS: 000181586900017A novel, simple, fast, cheap and pollution-free method was developed for recovering the silver from waste X-ray photographic films with NaOH stripping. The method has a number of advantages because it obviates the need for burning, oxidizing, electrolysis or purifying steps. Moreover, all experiments were carried out in the same flask, unlike other techniques. Silver recovery conditions were optimized and silver a purity level of 99% was recovered. The metal impurities (Al, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb and Sn) in the recovered silver were determined using the ICP-MS method. The results were compared with results in the literature for high-purity silver using the same method