Solid phase extraction of trace amounts of cadmium(II) ions in water and food samples using iron magnetite nanoparticles modified by sodium dodecyl sulfate and 2-mercaptobenzothiazole.
A new, simple and rapid method for solid phase extraction and preconcentration of trace amounts of cadmium ions using 2-mercaptobenzothiazole/sodium dodecyl sulfate immobilized on magnetite nanoparticles (MBT-SDS-MNPs) was proposed. The method is based on the extraction of cadmium ions via complexation with MBT immobilized on SDS-coated MNPs and their determination by flame atomic absorption spectrometry. The effects of different parameters - pH; eluent type, concentration and volume; amounts of salt and adsorbent; contact time and interfering ions - on the adsorption of cadmium ions were studied. Under optimized conditions, the calibration curve was linear in the range of 10-5,000 μg L-1. Detection limit and relative standard deviation of the proposed method were 0.009 μg L-1and 2.2%, respectively. The adsorption data were analyzed by Langmuir and Freundlich isotherm models and a maximum adsorption amount of 24.80 mg g-1, a Langmuir adsorption equilibrium constant (b) of 4.62 and Freundlich constants Kfand n of 6.075 mg1-1/nL1/ng-1and 2.391, respectively, were obtained. Finally, this adsorbent was successfully used for extraction of cadmium from water and food samples.
Department of Chemistry Management, Ilam Branch, Islamic Azad University, Ilam, Iran E-mail: abosina2000@yahoo.com.
Shahriar
S
Abbasi
Department of Chemistry Management, Ilam Branch, Islamic Azad University, Ilam, Iran E-mail: abosina2000@yahoo.com.
Mehdi
M
ShanbehDehbalai
Department of Chemistry Management, Ilam Branch, Islamic Azad University, Ilam, Iran E-mail: abosina2000@yahoo.com.
Hossein
H
Khani
D000327:Adsorption; D052160:Benzothiazoles / Q000737:chemistry*; D002104:Cadmium / Q000032:analysis*; D002138:Calibration; D005502:Food; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D057230:Limit of Detection; D058185:Magnetite Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009994:Osmolar Concentration; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D014961:X-Ray Diffraction
D052160:Benzothiazoles; D007477:Ions; D058185:Magnetite Nanoparticles; D014874:Water Pollutants, Chemical; D002104:Cadmium; D014867:Water; D012967:Sodium Dodecyl Sulfate; C005563:captax; D007501:Iron