Mercapto-modified magnesium silicate micro-particles for efficient extraction and preconcentration of mercury ions from estuary waters

2018 ◽  
Vol 10 (27) ◽  
pp. 3393-3401 ◽  
Author(s):  
Morteza Sajedifard ◽  
Kamal Ghanemi ◽  
Yadollah Nickpour
Keyword(s):  
Magnesium Silicate ◽  
Mercury Ions ◽  
Micro Particles ◽  
Preconcentration Technique ◽  
Efficient Extraction

A quick, facile, and straightforward preconcentration technique based on the modification of magnesium silicate with mercapto-based ligands for sub-ppb determination of mercury ions in coastal seawaters.

Sphere-like CoS with nanostructures as peroxidase mimics for colorimetric determination of H2O2 and mercury ions

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 66963-66970 ◽  
Author(s):  
Haiguan Yang ◽  
Junqi Zha ◽  
Peng Zhang ◽  
Yuhao Xiong ◽  
Linjing Su ◽  
...  
Keyword(s):  
Solvothermal Method ◽  
Analytical Techniques ◽  
Colorimetric Determination ◽  
Mercury Ions ◽  
Peroxidase Mimics ◽  
First Time ◽  
Facile Solvothermal Method

CoS, which was prepared using a facile solvothermal method, and characterized using various analytical techniques, was demonstrated for the first time to exhibit intrinsic peroxidase-like activity.

The experimental determination of hydromagnesite precipitation rates at 22.5–75ºC

2014 ◽  
Vol 78 (6) ◽  
pp. 1405-1416 ◽  
Author(s):  
U.-N. Berninger ◽  
G. Jordan ◽  
J. Schott ◽  
E. H. Oelkers
Keyword(s):  
Low Temperature ◽  
Experimental Determination ◽  
Closed System ◽  
Equilibrium Constants ◽  
Magnesium Silicate ◽  
Silicate Mineral ◽  
Dissolution Rates ◽  
Dissolution And Precipitation

Natural hydromagnesite (Mg5(CO3)4(OH)2·4H2O) dissolution and precipitation experiments were performed in closed-system reactors as a function of temperature from 22.5 to 75ºC and at 8.6 < pH < 10.7. The equilibrium constants for the reaction Mg5(CO3)4(OH)2·4H2O + 6H+ = 5Mg2+ + 4HCO3– + 6H2O were determined by bracketing the final fluid compositions obtained from the dissolution and precipitation experiments. The resulting constants were found to be 1033.7±0.9, 1030.5±0.5 and 1026.5±0.5 at 22.5, 50 and 75ºC, respectively. Whereas dissolution rates were too fast to be determined from the experiments, precipitation rates were slower and quantified. The resulting BET surface areanormalized hydromagnesite precipitation rates increase by a factor of ~2 with pH decreasing from 10.7 to 8.6. Measured rates are approximately two orders of magnitude faster than corresponding forsterite dissolution rates, suggesting that the overall rates of the low-temperature carbonation of olivine are controlled by the relatively sluggish dissolution of the magnesium silicate mineral.

Determination of cadmium in cosmetics from Kermanshah, Iran by graphite furnace atomic absorption spectrometry

2017 ◽  
Vol 41 (20) ◽  
pp. 11948-11954 ◽  
Author(s):  
Toraj Ahmadi-Jouibari ◽  
Nazir Fattahi ◽  
Nezam Mirzaei ◽  
Kiomars Sharafi ◽  
Hamid Reza Ghafari
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
High Performance ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Graphite Furnace Atomic Absorption ◽  
Preconcentration Technique ◽  
Drop Flow

Continuous sample drop flow-based microextraction (CSDF-ME) combined with graphite furnace atomic absorption spectrometry (GFAAS) has been developed as a high-performance preconcentration technique for the determination of cadmium in cosmetic samples.

Sensitive and selective determination of trace amounts of mercury ions using dimercaprol functionalized graphene quantum dot modified glassy carbon electrode

Nanoscale ◽  
2021 ◽  
Author(s):  
Maria Esmaeili ◽  
Fatemeh Ahour ◽  
Sajjad Keshipour
Keyword(s):  
Electron Microscopy ◽  
Quantum Dot ◽  
Carbon Electrode ◽  
Functionalized Graphene ◽  
Mercury Ions ◽  
Modified Glassy Carbon Electrode ◽  
Graphene Quantum Dot ◽  
Selective Determination ◽  
Transmission Electron

A novel nanomaterial is synthesized based on the functionalization of graphene quantum dot with dimercaprol (GQD-DMC). Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy...

scholarly journals Highly Efficient Extraction Procedures Based on Natural Deep Eutectic Solvents or Ionic Liquids for Determination of 20-Hydroxyecdysone in Spinach

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4736
Author(s):  
Sylwia Bajkacz ◽  
Kornelia Rusin ◽  
Anna Wolny ◽  
Jakub Adamek ◽  
Karol Erfurt ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Extraction Procedure ◽  
Deep Eutectic Solvents ◽  
Molar Ratio ◽  
Green Extraction ◽  
Natural Deep Eutectic Solvents ◽  
Efficient Extraction ◽  
Solid Liquid ◽  
Extraction Agent

A novel, efficient extraction procedure based on natural deep eutectic solvents (NADES) and ionic liquids (ILs) for determination of 20-hydroxyecdysone (20-E) in spinach has been developed. NADES, the first green extraction agent, with different hydrogen bond donors and acceptors are screened in order to determine extraction efficiencies. NADES consisting of lactic acid and levulinic acid at a molar ratio of 1:1 exhibits the highest yields. ILs, the second green extraction agent, with various cations and anions are also investigated, where [TEA] [OAc]·AcOH, χAcOH = 0.75 displays the highest recovery. Moreover, NADES-SLE and IL-SLE (SLE, solid-liquid extraction) parameters are investigated. Using the obtained optimized method, the recoveries of the target compound in spinach are above 93% and 88% for NADES-SLE and IL-SLE procedure, respectively. The methods display good linearity within the range of 0.5–30 μg/g and LODs of 0.17 µg/g. The proposed NADES-SLE-UHPLC-UV and IL-SLE-UHPLC-UV procedures can be applied to the analysis of 20-E in real spinach samples, making it a potentially promising technique for food matrix. The main advantage of this study is the superior efficiency of the new, green extraction solvents, which results in a significant reduction of extraction time and solvents as compared to those in the literature.

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