Temperature-controlled ionic liquid dispersive liquid–liquid microextraction combined with fluorescence detection of ultra-trace Hg²⁺ in water

Abstract

Significant efforts have been devoted to developing trace-level quantification of Hg2+.

Determination of Mercury(II) on A Centrifugal Microfluidic Device Using Ionic Liquid Dispersive Liquid−Liquid Microextraction

“…This result was consistent with our previous investigation on the impact of NaClO 4 on the solubility of IL in water [21]. In comparison to IL-DLLME in conventional approaches [12], the volume of the sample was reduced by two orders of magnitude and operation time was reduced to 20 min.…”

“…As a result, the excitation wavelength was set at 690 nm for two-photon fluorescence microscope. The remaining detection conditions were based on the experimental conditions in our previous study [12], the fluorescence images of 10 µM PTR probe and Hg 2+ in different concentrations were collected in the detection solutions (approximately 2 µL IL, 1.8 µL ACN, and 4.2 µL water).…”

“…Ionic liquids (ILs), as environmentally friendly extractants, play increasingly important roles in extracting a large amount of bioactive compounds [11]. In our previous study, IL-DLLME was employed to highly preconcentrate ultra-trace mercury(II) followed by selective fluorescence detection (FD) to demonstrate very low detection limit [12]. However, manual operation of IL-DLLME was labor-intensive, instrument-dependent, time-consuming, and error-prone.…”

“…To the best of our knowledge, there have been no reports of performing IL-DLLME with a centrifugal microfluidic device, especially considering the large volume ratio of sample to IL. Based on the salting-out effect of N -octylpyridinium tetrafluoroborate IL [21] and IL-DLLME-FD method [12], we successfully performed salt-controlled (SC) IL-DLLME-FD method for the detection of Hg 2+ with a centrifugal microfluidic device. Red dye was used to validate this method, which allowed visual examination with the naked eye of the high degree of enrichment.…”

Synthesis of magnetite@MIL‐53(Fe)‐NH‐CS2 via postsynthetic modification for extraction/separation of ultra‐trace Hg (II) from some real samples and its subsequent quantification by CVAAS

“…To solve this problem and to present accurate and reliable results, a separation/preconcentration step is mandatory. [3] Various separation/preconcentration methods such as liquid-liquid extraction, [5,6] cloud point extraction, [7] solid phase extraction (SPE), [8][9][10] ion exchange, [11] coprecipitation, [12] hollow fiber liquid phase microextraction, [13,14] dispersive liquid-liquid microextraction, [15][16][17] electromembrane extraction, [18,19] and single drop microextraction [20] have reported for separation/preconcentration of mercury in real matrixes. Among the mentioned extraction methods, SPE is the most employed separation/preconcentration technique prior to determination of metals ions.…”