Speciation and determination of ultra trace amounts of chromium by solidified floating organic drop microextraction (SFODME) and graphite furnace atomic absorption spectrometry

• Published in: Journal of hazardous materials Vol. 186; no. 1; pp. 169 - 174
• Main Authors: Moghadam, Masoud Rohani, Dadfarnia, Shayessteh, Haji Shabani, Ali Mohammad
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 15.02.2011; Elsevier
• Subjects: 2-Thenoyltrifluoroacetone; Applied sciences; Atomic absorption analysis; atomic absorption spectrometry; chelating agents; Chromium; Chromium - analysis; Chromium - urine; Chromium speciation; detection limit; Exact sciences and technology; Extraction; Furnaces; Graphite; Graphite furnace atomic absorption spectrometry; Hydrogen-Ion Concentration; microextraction; mineral water; Pollution; salt concentration; Solidified floating organic drop microextraction; Speciation; Spectrophotometry, Atomic - methods; Standard deviation; tap water; Urine; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - urine; 2-Thenoyltrifluoroacetone; Graphite furnace atomic absorption spectrometry; Chromium speciation; Solidified floating organic drop microextraction; Urine; Pollutant behavior; Tap water; Drop; Water well; Chelating agent; pH; Speciation; Atomic absorption spectrometry
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2010.10.101

Solidified floating organic drop microextraction (SFODME) method in combination with graphite furnace atomic absorption spectrometry (GFAAS) has been used for the determination of chromium species in water and urine samples. 1-undecanol containing 2-thenoyltrifluoroacetone (TTA) was used as a selective chelating agent for the extraction of Cr(III). The total Cr was determined after the reduction of Cr(VI) to Cr(III) with hydroxylamine. The concentration of Cr(VI) was determined from the difference between the concentration of total chromium and the Cr(III). Several variables such as the sample pH, concentration of TTA, salt concentration, extraction time and the sample volume were investigated in detail. Under the optimum conditions, the limit of detection of the proposed method was 0.006μgl−1 for Cr(III) and the relative standard deviation for six replicate determinations at 0.1μgl−1 Cr(III) was 5.1%. The proposed method was successfully applied for the determination of chromium species in tap water, well water, mineral water, and urine samples.