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Determination of Cadmium at Trace Levels in River Water Samples by Simultaneous Ion-Pairing and Mixed Micelle Extraction Prior to UV-Vis Spectrophotometry
Paper Type  |
Contributed Paper |
Title |
Determination of Cadmium at Trace Levels in River Water Samples by Simultaneous Ion-Pairing and Mixed Micelle Extraction Prior to UV-Vis Spectrophotometry |
Author |
Shahram Nekouei* and Farzin Nekouei |
Email |
sh.nekouei@hotmail.com |
|
Abstract: A procedure for simultaneous separation/preconcentration of cadmium in water river samples, based on cloud point extraction (CPE) as a prior step to its determination by spectrophotometric method in a ternary ion association system has been developed for river water samples. The preconcentration was applied using simultaneous [Cd (SCN4)]-2 complexation and forming ternary ion association system with Toluidine Blue-O (TBO) and cationic surfactant N-cetyl-N-N-N-trimethyl ammonium bromide (CTAB), accordingly. The hydrophobic complex was quantitatively entrapped with octylphenoxy- polyethoxyethanol (Triton X-114) from aqueous solution. The parameters affecting the extraction efciency of the proposed method, such as sample pH, complexing agent concentration (SCN-,TBO+ and CTAB), buffer amount, ionic and non ionic surfactant concentration, temperature, and incubation time were optimized. The relative standard deviation (RSD) for nine replicate determinations at 50 mg L-1 of cadmium was 3.11%. The resultant limit of detection (LOD) and limit of quantification (LOQ) were 2.1 and 7 mg L-1, respectively. The calibration graph was linear with a correlation coefcient of 0.9985 in the range of 7-1000 mg L-1 of cadmium. |
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Start & End Page |
1131 - 1140 |
Received Date |
2014-05-14 |
Revised Date |
|
Accepted Date |
2014-11-11 |
Full Text |
Download |
Keyword |
cadmium, ternary ion association system, azo dye, cloud point extraction |
Volume |
Vol.43 No.5 (OCTOBER 2016) |
DOI |
|
Citation |
Nekouei* S. and Nekouei F., Determination of Cadmium at Trace Levels in River Water Samples by Simultaneous Ion-Pairing and Mixed Micelle Extraction Prior to UV-Vis Spectrophotometry , Chiang Mai Journal of Science, 2016; 43(5): 1131-1140. |
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