Spectrophotometric determination of mercury using vortex-assisted liquid--liquid microextraction

Abstract

A novel method for the determination of mercury(II) is suggested. The procedure is based on the formation of an ion associate between the bromide complex of Hg(II) and Astrazon Red 6B dye and vortex-assisted liquid-liquid microextraction of the ion associate formed, with subsequent spectrophotometric detection. The variables that affect the procedure, such as pH, the concentration of ligand and dye, the type and volume of extraction solvent, and the rate and time of vortex mixing, were optimized. Under optimum conditions (pH 2.0, 0.01 mol L −1 KBr, 2 × 10 −4 mol L −1 AR6B, 50 µ L of the extraction mixture toluene:dichlorethane, 4:1, v:v, vortex mixing for 100 s at 1600 rpm) the linear range was 8 to 200 µ g L −1 Hg(II), with the limit of detection at 1.5 µ g L −1. The method was applied to the determination of mercury in water samples.

An efficient ionic liquid-based cloud point extraction to preconcentrate mercury in environmental samples and hair of occupational workers before spectrophotometric detection

“…For estimation of Hg(II) in various samples, several instruments including inductively coupled plasma with mass spectrometry [6] or atomic emission spectrometry [7], gas chromatographyinductively coupled plasma-mass spectrometry [8], cold vapour atomic absorption spectrometry [7,9], HPLC coupled to cold vapour atomic fluorescence spectrometry [10], graphite furnace atomic absorption spectrometry [11] and spectrophotometry [12][13][14][15], were used. Furthermore, these methods have several drawbacks, such as low sensitivity, significant matrix interference, and the necessity for highly experienced laboratory specialists to carry them out.…”

Ultrasound assisted supramolecular liquid phase microextraction procedure for Sudan I at trace level in environmental samples

“…SUPRAS increases extraction efficiency by interacting with molecules and decreasing the extraction time. The amount of mixing alkanol and THF used in the formation of SUPRAS is very important [25][26][27][28][29][30][31][32]. According to our knowledge, microextraction studies of Sudan I with supramolecular solvents have not been performed before.…”