title: Selectivity enhancement of Arsenazo(III) reagent towards heavier lanthanides using polyaminocarboxylic acids: a spectrophotometric study.
abstract: A new study has been conducted to quantify lanthanide(III) ions using Arsenazo III-polyaminocarboxylic acid (PACA) system. The study disclosed two different analytically important information: (i) λmax of lanthanide-Arsenazo III complexes for lighter lanthanides like Ce(III) and Nd(III) did not shift from its original position on addition of PACA and (ii) for heavier lanthanides like Dy(III), Tm(III) and Lu(III) a new λmax at 538 nm was observed, while wavelengths at 610 nm and 654 nm were disappeared in presence of ethylenediaminetertracetic acid (EDTA) and trans-1,2-Diaminocyclohexane-N,N,N',N'-tetraacetic acid (DCTA), further the intensity of peak decreased with increase in lanthanide(III) ion concentration. Effect of ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA) and N-(2-hydroxyethyl) ethylenediamine-N,N',N'-triacetic acid (EDTA-OH) on Arsenzo(III)-Ln(III) complex is very weak and there is no analytically importance of such interaction. Moreover, this work confirms that Nd(III) and heavy lanthanides can be successfully determined with high accuracy in the working range of concentration of these metal ions.
authors.affiliation: School of Chemistry & Biochemistry, Thapar University, Patiala 147004, India.
authors.forename: Komal
authors.initials: K
authors.lastname: Matharu
authors.affiliation: School of Chemistry & Biochemistry, Thapar University, Patiala 147004, India.
authors.forename: Susheel K
authors.initials: SK
authors.lastname: Mittal
authors.affiliation: Materials Chemistry Division, School of Advanced Sciences, VIT University, Vellore 632014, India. Electronic address: ashok312002@gmail.com.
authors.forename: S K
authors.initials: SK
authors.lastname: Ashok Kumar
authors.affiliation: Department of Applied Chemistry, SV National Institute of Technology, Surat 395007, India.
authors.forename: Suban K
authors.initials: SK
authors.lastname: Sahoo
mesh_terms: D001150:Arsenazo III / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D004492:Edetic Acid / Q000031:analogs & derivatives / Q000737:chemistry; D007202:Indicators and Reagents; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D013053:Spectrophotometry / Q000379:methods*; D017186:Titrimetry
chemical_list: D002264:Carboxylic Acids; D007202:Indicators and Reagents; D028581:Lanthanoid Series Elements; D001150:Arsenazo III; C005390:CDTA; D004492:Edetic Acid
keywords: Arsenazo III; DCTA EGTA-OH; EDTA; HEDTA; Lanthanides; Spectrophotometric titration