Speciation determination of chromium(III) and (VI) using preconcentration cloud point extraction with flame atomic absorption spectrometry (FAAS)

• Published in: Journal of hazardous materials Vol. 150; no. 3; pp. 582 - 586
• Main Authors: Kiran, K., Kumar, K. Suresh, Prasad, B., Suvardhan, K., Lekkala, Ramesh Babu, Janardhanam, K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 11.02.2008; Elsevier
• Subjects: Applied sciences; bis-(2-Hydroxy-1-napthaldehyde) thiourea; Chromium - analysis; Chromium - chemistry; Chromium(III) and (VI) species; Cloud point extraction; Environmental Monitoring; Environmental samples; Exact sciences and technology; Flame atomic absorption spectrometry; Hydrogen-Ion Concentration; Industrial Waste; Naphthalenes - chemistry; Octoxynol - chemistry; Pollution; Rivers - chemistry; Spectrophotometry, Atomic - methods; Surface-Active Agents - chemistry; Temperature; Thiourea - chemistry; Triton X-100; Viscosity; Waste Disposal, Fluid; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - chemistry; Water Supply - analysis; Cloud point extraction; Chromium(III) and (VI) species; Environmental samples; Flame atomic absorption spectrometry; bis-(2-Hydroxy-1-napthaldehyde) thiourea; Triton X-100; Complexation; Rame atomic absorption spectrometry; Clouds; Pollutant behavior; Non ionic surfactant; Micelle; Extract; Surfactant; Thioureas; Flame spectrometry; Chromium III; Chelating agent; Preconcentration; pH; Speciation; Atomic absorption spectrometry
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2007.05.007

bis-[2-Hydroxy-1-naphthaldehyde] thiourea was synthesized and preconcentration cloud point extraction (CPE) for speciation determination of chromium(III) and (VI) in various environmental samples with flame atomic absorption spectrometry (FAAS) has been developed. Chromium(III) complexes with bis-[2-hydroxynaphthaldehyde] thiourea is subsequently entrapped in the surfactant micelles. After complexation of chromium(III) with reagent, the analyte was quantitatively extracted to the surfactant-rich phase in the non-ionic surfactant Triton X-100 after centrifugation. The effect of pH, concentration of chelating agent, surfactant, equilibration temperature and time on CPE was studied. The relative standard deviation was 2.13% and the limits of detection were around 0.18 μg L −1.