Highly Selective and Sensitive Detection of Hg(II) from HgCl2 by a Simple Rhodamine-Based Fluorescent Sensor

Abstract

N-acryloyl rhodamine B hydrazide, a non-responsive control of a colorimetric Cu(2+) sensor, was used as a turn-on fluorescent sensor for Hg(II) from HgCl2 in the presence of AgNO3. The detection was highly selective and sensitive, and a large number of environmentally and biologically relevant metal ions, such as Na(+), K(+), Ca(2+), Mg(2+), Fe(3+), Cu(2+), Zn(2+), Cr(3+), Pb(2+), Ni(2+), Fe(2+), Mn(2+), Co(2+), Cd(2+), including Hg(II) from the easy dissociated salts, did not show significant interference. The fluorescence of the sensor (10 μM) was enhanced 74 folds by 10 equiv. of Hg(II) from HgCl2 in THF/HAc-NaAc (1/1, v/v, pH = 6) aqueous buffer solution containing 20 equiv. of AgNO3. The maximal fluorescence intensity increased linearly with the concentration of Hg(II) in the range of 0-70 μM. The detection limit of Hg(II) was 0.59 μM. The sensing mechanism was explored by Job's plot experiment, reversible experiment, mass spectrum analysis, spectroscopic analysis, and thin-layer chromatography.

Dual chemosensor for the rapid detection of mercury(ii) pollution and biothiols

“…A linear relationship between the UV absorbance at 585 nm and metal ion concentration was found within the concentration range 5×10 -5 M (50µM) to 1×10 -6 M (1µM) of Hg 2+ ions and represented by the equation y = 0.0207x + 0.0264 (correlation coefficient R 2 = 0.996). The limit of detection (LOD) was calculated using the equation DL = 3 σ /K (σ = standard deviation and K is the slope of the calibration curve), and found to be 4.7× 10 -7 M. [41][42][43] The limit of quantification (LOQ) of the UV method was identified experimentally to be 2.5×10 -6 M (Fig. 4a).…”

Highly sensitive detection of Cr(VI), Pb(II) and Cd(II) ions by a new fluorescent sensor based on 4-amino-3-hydroxynaphthalene sulfonic acid-doped polypyrrole

“…Also, it is very toxic, even at low doses, for many animal and plant species, aquatic and terrestrial [20]. Therefore, highly sensitive flu-orescent sensors have been developed for the efficient detection and recognition of toxic heavy metallic ions, such as Hg(II), Zn(II), Al(III), and Cr(VI), in order to determine the level of metallic pollution of natural waters [21][22][23].…”

Synthesis and properties of three novel rhodamine-based fluorescent sensors for Hg2+

“…A large number of 1,8-naphthalimide [5][6][7], rhodamine [8][9][10][11][12], BODIPY [13][14][15], coumarin [16,17], and dansyl-based [18,19] Hg 2+ fluorescent sensors have been reported. However, some of them could only respond to Hg 2+ in organic media [9,11,13], others suffered from poor sensing properties including selectivity, sensitivity, interference immunity and practicability [8,12,20]. The overall performance of the sensors still remains to improve and the relationship between the structure and the performance of the sensor has not been well established.…”