Development of surfactant assisted spectrophotometric method for determination of selenium in waste water samples.
A new, simple and highly selective method for spectrophotometric determination of selenium in waste water samples is described. Selenium(IV) oxidizes I(-) ions into I(2) which subsequently reacts with excess of I(-) ion in the acidic media to give tri-iodide ions (I(3)(-)), and it further reacts with cetylpyridinium cation (CP(+)) to give a violet colored species. The value of molar absorptivity of the ion-associate species in terms of selenium is 1.80 x 10(4) L mol(-1)cm(-1) at lambda(max) 510 nm. The detection limit of the method is 10 ng mL(-1) Se. The calibration curve is linear over 50-1000 ng mL(-1) Se with slope, intercept and co-relation coefficient of 0.23, -4.0 x 10(-4) and +0.99, respectively. None of the tested diverse ions interfered in the present method. The method has been tested for the determination of selenium in waste water samples.
Agrawal
Kavita
K
School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur 492010, CG, India. akavita9@rediffmail.com
Patel
Khageshwar Singh
KS
Shrivas
Kamlesh
K
D000143:Acids / Q000737:chemistry; D001205:Ascorbic Acid / Q000737:chemistry; D002138:Calibration; D002412:Cations; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D007454:Iodides / Q000737:chemistry; D007477:Ions; D010100:Oxygen / Q000737:chemistry; D012643:Selenium / Q000032:analysis* / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
D000143:Acids; D002412:Cations; D007454:Iodides; D007477:Ions; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water; D012643:Selenium; D001205:Ascorbic Acid; D010100:Oxygen