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Cadmium Extraction from Solutions by Solid-Phase and its Trace Determination
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 Title & Authors
Cadmium Extraction from Solutions by Solid-Phase and its Trace Determination
Ashrafi, F.; Attaran, A.M.; Kermani, N. Memar;
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 Abstract
A new sensitive and selective spectrophotometric method for determination of trace amounts of cadmium using a polyvinyl chloride membrane containing bis-(2-ethylhexyl)phthalate as a solid phase extraction medium was investigated. Bis-(2-ethylhexyl)phthalate has used as a plasticizer. Cd(II) in an aqueous solution was trapped on the membrane in the form of colorful Cd (II)-I- - MG complexes (which MG is malachite green) and the cadmium complex was concentrated in the membrane. The absorbance of the green membrane was measured at 629 nm using a spectrophotometer, and then, the concentration of the cadmium was calculated using a calibration curve, which expressed the relationship between the Cd(II) concentration and the membrane absorbance after coloring for 25 min. The calibration curve was linear in the range of 10-760 μgL-1 cadmium in the test solution. The detection limit based on the 3Sbl criterion was 1.8199 μgL-1 and the relative standard deviations (RSD) were less than 4 % (n=5). The proposed method has been successfully applied to the determination of trace amounts of cadmium in the Tadjan River water sample (Sari-Iran), and the mean value of 28.7 μgL-1 was obtained.
 Keywords
 Language
English
 Cited by
1.
Extractive Separation of Cadmium(II) using Cyanex 923 from Ammonium Thiocyanate Medium, Separation Science and Technology, 2013, 48, 3, 493  crossref(new windwow)
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