RETRACTED: Spectrophotometric determination of V(V) in environmental, biological, pharmaceutical and alloy samples by novel oxidative coupling reactions

Rekha, D.; Kanchi, Suvardhan; Kumar, K. Suresh; Subrahmanyam, P.; Jayaraj, B.; Naidu, G. R. K.; Chiranjeevi, P.

doi:10.1016/j.jhazmat.2006.06.061

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Electrophilic coupling reaction has attracted considerable attention for quantitative analysis of many environmental toxicants [33,34]. The mechanism of the reaction between PNZ, CPN or TPN, MBTH and RSC in acidic medium to yield a blue color was postulated in Fig.…”

Section: Reaction Mechanismmentioning

confidence: 99%

Novel oxidative electrophilic coupling reactions of phenoxazine derivatives with MBTH and their applications to spectrophotometric determination of residual chlorine in drinking water and environmental water samples

Al-Okab

Syed

2009

Journal of Hazardous Materials

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Section: Reaction Mechanismmentioning

confidence: 99%

Novel oxidative electrophilic coupling reactions of phenoxazine derivatives with MBTH and their applications to spectrophotometric determination of residual chlorine in drinking water and environmental water samples

Al-Okab

Syed

2009

Journal of Hazardous Materials

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Spectrophotometric Determination of Vanadium in Carbonaceous Shales (Stone Coal Ores) Using 2‐(5‐bromo‐2‐pyridylazo)‐5‐diethylaminophenol

Cheng

Kong

2007

Geostandard Geoanalytic Res

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A selective and sensitive spectrophotometric method has been developed for determining the total amount of vanadium in carbonaceous shales (stone coal ores). The method is based on the reaction of vanadium(V) with the chromophore reagent 2‐(5‐bromo‐2‐pyridylazo)‐5‐diethylaminophenol (5‐Br‐PADAP) in the presence of hydrogen peroxide. In a 0.072 mol l−1 sulfuric acid medium, 5‐Br‐PADAP reacts with vanadium(V) to form a red‐violet complex with a maximum absorption peak at 596 nm with an apparent molar absorption coefficient of the complex of 8.45 × 104 l mol−1 cm−1. Beer's law was obeyed in the range 0–25 μg vanadium in 25 ml of solution, with a correlation coefficient of 0.9995. Interferences due to various non‐target ions were also investigated and high quantities of other common inorganic ions were tolerable. The method involved the dissolution of the ore sample by Na2O2 fusion, followed by filtering of the alkali solution after which Fe(III), Cu(II), Ni(II) and Co(II) etc. were effectively separated from the solution by precipitation in a NaOH solution. Selectivity was increased with the use of EDTA as a masking agent. The vanadium in ore samples was determined with a relative deviation (RSD) between 0.20 and 0.76%, and has been successfully applied to the determination of vanadium‐bearing stone coal ores. The results indicated that the accuracy of 5‐Br‐PADAP spectrophotometry is comparable with the ICP‐AES method. The characteristics of the method, i.e., simplicity, selectivity, sensitivity and rapid calibration, make it specially suitable for routine analysis.

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RETRACTED: Spectrophotometric determination of V(V) in environmental, biological, pharmaceutical and alloy samples by novel oxidative coupling reactions

Cited by 2 publications

References 16 publications

Novel oxidative electrophilic coupling reactions of phenoxazine derivatives with MBTH and their applications to spectrophotometric determination of residual chlorine in drinking water and environmental water samples

Novel oxidative electrophilic coupling reactions of phenoxazine derivatives with MBTH and their applications to spectrophotometric determination of residual chlorine in drinking water and environmental water samples

Spectrophotometric Determination of Vanadium in Carbonaceous Shales (Stone Coal Ores) Using 2‐(5‐bromo‐2‐pyridylazo)‐5‐diethylaminophenol

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