Premium
Iron species determination by task‐specific ionic liquid‐based in situ solvent formation dispersive liquid–liquid microextraction combined with flame atomic absorption spectrometry
Author(s) -
Sadeghi Susan,
Ashoori Vahid
Publication year - 2017
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.8335
Subject(s) - ionic liquid , chemistry , detection limit , extraction (chemistry) , solvent , aqueous solution , tap water , atomic absorption spectroscopy , bromide , analytical chemistry (journal) , salt (chemistry) , absorption (acoustics) , chromatography , liquid–liquid extraction , inorganic chemistry , materials science , catalysis , physics , organic chemistry , quantum mechanics , environmental engineering , engineering , composite material , biochemistry
BACKGROUND The task‐specific ionic liquid ( TSIL ) of 1‐ethyl‐3‐methylimidazolium bromide functionalized with 8‐hydroxyquinoline was used as a chelating agent and extracting solvent for dispersive liquid–liquid microextraction and subsequent determination of Fe( III ) by flame atomic absorption spectrometry. The in situ solvent formation of TSIL using KPF 6 provided the desired water‐immiscible ionic liquid. The total Fe concentration could be determined after pre‐oxidation of Fe( II ) to Fe( III ). Various factors affecting the proposed extraction procedure were optimized. RESULTS The proposed analytical conditions were: sample pH 5, TSIL amount 0.3% (w/v), KPF 6 amount 0.15% (w/v), anti‐sticking 0.1% (w/v) and salt concentration 5% (w/v). Under optimal conditions, the linear dynamic ranges for Fe( III ) and total Fe were 20–80 and 20–110 ng mL −1 , respectively, with a detection limit of 6.9 ng mL −1 for Fe( III ) and relative standard deviation of 2.2%. The proposed method was successfully applied to the determination of trace Fe( III ) in water (underground, tap, refined water and artificial sea water) and beverage (apple, tomato, and tea) samples. CONCLUSION The developed method offers advantages such as simplicity, ease of operation, and extraction of Fe( III ) from aqueous solutions without the use of organic solvent. It was successfully applied for iron speciation in different real samples. © 2017 Society of Chemical Industry