Exploiting of the phenoxazine as first – ever use ligand in rapid spectrophotometric methods for the determination of chromium(VI) in environmental samples
Journal Title: Ovidius University Annals of Chemistry - Analele Universităţii "Ovidius" Constanţa. Seria chimie - Year 2012, Vol 23, Issue 2
Abstract
Two new rapid, accurate, sensitive, reproducible and economical spectrophotometric methods are described for the determination of hexavalent chromium in bulk and in environmental samples like, water and soil using two new electrophilic coupling spectrophotometric reagents, 2-amino-2′,5-dichlorobenzophenone (MCB) and 2-amino-5-chloro-2'-fluorobenzophenone (MFB) and first-ever use phenoxazine (PNZ). Both methods are based on the oxidation of (MCB) or (MFB) by chromium(VI) in hydrochloric acid medium and coupling with PNZ to yield red colored, which are stable for about 12 h and have an absorbance maximum 520 nm. Beer’s law is obeyed for chromium(VI) in the concentration ranges 0.15-1.20 µg mL[sup]-1[/sup] and 0.17[sup]-1[/sup].41 µg mL[sup]-1[/sup] respectively. The optimum reaction conditions and other important analytical parameters were established to maximize sensitivity of these methods. Interference by various non-target ions was also investigated. The performance of these methods was further evaluated by recovery tests applying standard addition method, which indicated that there is no significant difference between the proposed methods and the standard reference spectrophotometric method.
Authors and Affiliations
ABDUL GALIL Mansour, AL OKAB Riyad Ahmed
Keywords
Related Articles
- EP ID EP141127
- DOI -
- Views 52
- Downloads 0
Corrosion behavior of steel in biodiesel of different origin
This study aims to characterize the corrosion behavior of steel by static immersion tests in biodiesel obtained from three different types of vegetable oils (sunflower oil, rapeseed oil and corn oil) at room temperature...
Ensuring security of local gas supply using pipeline gas storage
This paper presents a natural gas supply system of a locality. Since power consumption is non-stationary, for supplying the consumption peaks it is used a gas deposit kept in a pipeline built near the locality. The viabi...
Regeneration of used engine lubricating oil by solvent extraction
Huge amounts of used lubricating oils from automotive sources are disposed of as a harmful waste into the environment. For this reason, means to recover and reuse these wastes need to be found. Problems arising from acid...
Increasing calculation accuracy in the design stage of a gas transportation system
The paper presents a critical evaluation of the equations used to calculate the flow and pressure for transport pipelines. A highly accurate method for calculating gas parameters is proposed. The final part of the...
Hydrogenation of 1-octene by Co-Mo/MCM-41 catalysts
The synthesis and characterization of MCM-41 supported Co-Mo catalysts and catalytic hydrogenation of 1-octene to n-octane were discussed. BET specific surface area of MCM-41, calculated from N[sub]2[/sub] adsorption/des...