The most common problems in spectrophotometric determination of various complex species originate from the background spectral interference. Thus, the present study aimed to overcome the spectral matrix interference for the precise analysis and speciation of mercury(II) in water by dual-wavelength β-correction spectrophotometry using 4-(2-thiazolylazo) resorcinol (TAR) as chromogenic reagent. The principle was based on measuring the correct absorbance for the formed complex of mercury(II) ions with TAR reagent at 547nm (lambda max). Under optimized conditions, a linear dynamic range of 0.1-2.0μgmL with correlation coefficient (R) of 0.997 were obtained with lower limits of detection (LOD) of 0.024μgmL and limit of quantification (LOQ) of 0.081μgmL. The values of RSD and relative error (RE) obtained for β-correction method and single wavelength spectrophotometry were 1.3, 1.32% and 4.7, 5.9%, respectively. The method was validated in tap and sea water in terms of the data obtained from inductively coupled plasma-optical emission spectrometry (ICP-OES) using student's t and F tests. The developed methodology satisfactorily overcomes the spectral interference in trace determination and speciation of mercury(II) ions in water.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.saa.2017.06.044 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unsaturated Sulfur Crown Ethers Can Extract Mercury(II) and Show Promise for Future Copernicium(II) Studies: A Combined Experimental and Computational Study.
Inorg Chem
January 2022
Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, California 94550, United States.
The unsaturated hexathia-18-crown-6 (UHT18C6) molecule was investigated for the extraction of Hg(II) in HCl and HNO media. This extractant can be directly compared to the recently studied saturated hexathia-18-crown-6 (HT18C6). The default conformation of the S lone pairs in UHT18C6 is endodentate, where the pocket of the charge density, according to the crystal structures, is oriented toward the center of the ring, which should allow better extraction for Hg(II) compared to the exodentate HT18C6.
View Article and Find Full Text PDFDirect Measurement of Aqueous Mercury(II): Combining DNA-Based Sensing with Diffusive Gradients in Thin Films.
Environ Sci Technol
November 2020
Ecohydrology Research Group, Department of Earth and Environmental Sciences & Water Institute, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
A highly specific DNA-functionalized hydrogel sensing layer was integrated with the diffusive gradients in thin films (DGT) technique for the direct determination of aqueous mercury(II). The DNA-functionalized layer in the DGT unit exhibited both high affinity (complexation constant = 10 at 25 °C) and high binding capacity (9.5 mg Hg disk) toward Hg.
View Article and Find Full Text PDFMethylmercury formation in boreal wetlands in relation to chemical speciation of mercury(II) and concentration of low molecular mass thiols.
Sci Total Environ
February 2021
Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden. Electronic address:
Methylmercury (MeHg) is a neurotoxin formed from inorganic divalent mercury (Hg) via microbial methylation, and boreal wetlands have been identified as major sources of MeHg. There is however a lack of studies investigating the relationship between the chemical speciation of Hg and MeHg formation in such environments, in particular regarding to role of thiol compounds. We determined Hg methylation potentials, k, in boreal wetland soils using two Hg isotope tracers: Hg(OH)(aq) and Hg bonded to thiol groups in natural organic matter, Hg-NOM(ads), representing Hg sources with high and low availability for methylation.
View Article and Find Full Text PDFCombined experimental and theoretical studies on adsorption mechanisms of gaseous mercury(II) by calcium-based sorbents: The effect of unsaturated oxygen sites.
Sci Total Environ
March 2019
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China.
Accurate mercury speciation measurements are critical for developing methods for mercury removal from flue gas, but the lack of reliable adsorbents has made Hg selective retention challenging. Calcium oxide (CaO) loaded on porous support is promising for HgCl selective adsorption because of its porosity and alkaline nature. The main hypothesis investigated in this paper is if the capacity of CaO sorbent for HgCl selective adsorption is attributed to its basic sites, then this will be drastically impacted by the calcium precursors.
View Article and Find Full Text PDFAn Ultrasensitive Detection Platform for Mercury Ions Speciation in Water Using Procaine Hydrochloride Ion Pair Coupled Extractive Spectrofluorimetry.
J Fluoresc
January 2019
Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah, 21589, Saudi Arabia.
A simple extractive spectrofluorimetric strategy for trace determination of mercury(II) ions in water employing procaine hydrochloride (PQ) as an ion pairing fluorescent tagging reagent has been established. The method was based upon the extraction of PQ from aqueous iodide media onto dichloromethane as a ternary complex ion associate [(PQ).(HgI)] at pH 9.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!