| dc.description.abstract | In this study, a separation/pre-concentration procedure, ultrasound assisted-cloud point extraction with modified
2-aminobenzimidazole (2-ABzI), was developed for the extraction of trace Hg2+ and CH3Hg+ and from
vinegar samples- modified copolymer coupled with Hg-binding chelator, 2-ABzI. The imidic copolymer was
characterized, and used for detection of the enriched Hg species by spectrophotometer at 332 nm. The method is
based on their pH-induced charge transfer sensitive complexation with copolymer matrix via 2-AmBzI moiety at
pH 6.0 and 4.5, and their extraction into the mixed micellar phase of the mixed non-ionic/ionic surfactants as
extractant/sensitivity enhancer. The variables influencing the extraction efficiency were optimized. From preconcentration
of 25-mL sample, with a changing calibration sensitivity and pre-concentration factor of 62.5, a
good rectilinear relationship between absorbance and concentrations of Hg species in ranges of 1–15, 15–150 μg
L����� 1 was obtained. The detection limits are 0.30 and 0.31 μg L����� 1, respectively. Its precision/accuracy were in
range of 3.1–7.6 % and 90.5–96 % after spiking (n: 5, for measurements of 5, 25 and 100 μg L����� 1 in same day and
three consecutive days). The matrix effect was also studied (n: 3, 100 μg L����� 1). The method is simple, costeffective,
fast, accurate, safe, highly stable and selective, which has successfully been applied to the speciation
of mercury in vinegar. | tr |
