Fluorimetric determination of methylmercury as an ion-association complex with rhodamine B in the presence of iodide

Abstract

A fluorimetric method for the determination of methylmercury was established. The method was based on the formation of an ionic pair between iodide-methylmercury-rhodamine B in hydrochloric acid, which can be extracted with benzene. The fluorescence emission was measured at λ ex /λ em 575/590 nm, and the experimental variables and possible interference were studied. The linear calibration range was 4 × 10 -8 mol/L ~ 5 × 10 -7 mol/L with a correlation coefficient of 0.9992. The detection limit was 1 × 10 -8 mol/L. The method was used to determine methylmercury in human hair. The recovery was in the range of 91% to 105% and the relative standard deviation was 2.8%. The results agreed with those obtained by gas chromatography with electron capture detection.

Inhibition of rhodamine B–ferricyanide chemiluminescence by Au nanoparticles toward the sensitive determination of mercury (II) ions

“…The interaction between Hg 2+ and RB can be clearly observed from changes of RB UVvis spectra in the presence of Hg 2+ [35,36]. 2) Reduction of Hg 2+ ions by citrate on the Au…”

Determination of methylmercury fluxes across the air–water and air–soil interfaces by gas chromatography with electron capture detection

“…The recoveries were in the range of 87-95%. In addition, gas chromatography with electron capture detection for the determination of MeHg has been validated by fluorimetric and spectrophotometric methods in previous reports [3,5].…”

“…A number of methods have been proposed for the determination of MeHg, such as, fluorimetry [5], atomic absorption spectrometry [6,7], atomic emission spectrometry [8], atomic fluorescence spectrometry [9], gas chromatography [10,11], high-performance liquid chromatography [12,13], ion chromatography [14], and capillary electrophoresis [15,16]. The different methods have been used for the determination of MeHg in water [17][18][19], soil [20][21][22], and air [23,24].…”