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Iron determination with micelle assisted liquid phase microextraction method

Jalal Hassan, Mojtaba Shamsipur

A simple and sensitive method based on direct solventmicroextraction was introduced for determination of iron in water samples. In this method iron (II) reacts to 1,10-phenantroline and then extracted into organic solvent followingmicelle formationwith sodiumdodecyl sulfonate (SDS). The parameters influencing the extraction processwere studied and optimumconditions were obtained as below: solvent type: 1-octanol, sample volume: 12 mL, 1-octanol volume, 100 L; pH = 7; temperature: 30 ºC; stirring rate of solution: 1000 rpm; ion-pairing concentration 30mgL-1; time: 30min; amount of 1,10-phenantroline: 2.5 mg and without addition of salt. The calibration graphwas linear for iron in the range of 10-2000 gL-1 and 3-10000 gL-1 for spectrophotometric and high performance liquid chromatography (HPLC) determination, respectively and limit of detection (LOD) based on 3Sbl was 3 and 1 g L-1by spectrophotometric and HPLCdetermination, respectively. This technique is found to be simple, sensitive, reproducible inexpensive, accurate and successfully applied for determination of iron inwater samples.