On-siteColorimetric Forensic Sensor (I): Quantitative Detection of Toxic H2S and NH3Gases Using Metal-Ion-modified Silica Powders

2015 ◽  
Vol 36 (10) ◽  
pp. 2434-2439 ◽  
Author(s):  
Seung-Jin Ryu ◽  
Eric Arifin ◽  
Shin-Woo Ha ◽  
Jin-Kyu Lee
Keyword(s):  
Metal Ion ◽  
Quantitative Detection ◽  
Modified Silica

scholarly journals Copper Ion Detection Method Based on a Quantum Dot Fluorescent Probe

2021 ◽  
Author(s):  
Pu YANG ◽  
Feng DONG ◽  
Yaguang YU ◽  
Jiahui SHI ◽  
Ming SUN
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Fluorescence Quenching ◽  
Linear Relationship ◽  
Fluorescent Probe ◽  
Metal Ion ◽  
Copper Ion ◽  
Quantitative Detection ◽  
Correction Coefficient ◽  
Modeling And Analysis

The heavy metal ion Cu2+ was used as the research object in this study. Cu2+ was detected using a cysteine- and glutathione-modified cadmium telluride quantum dot solution. Compounds of Cu2+ and modified quantum dots on the surface caused the fluorescence quenching of quantum dots. A linear relationship existed between the concentration and the intensity of the change in fluorescence quenching. Using this linear relationship, the quantitative detection of the Cu2+ content in the solution by quantum dots was achieved; the detection band was 476-800 nm. Under optimized conditions, the detection limit of the method was 3.58×10-5 mol/L (S/N=3, n=11), and the linear range was 3×10-7 to 8×10-4 mol/L. In a certain experimental environment, standard normal variate preprocessing of the characteristic band and partial least squares modeling and analysis yielded good self-prediction and actual prediction abilities. The correction coefficient was 0.9006. The RMSEC was 8.83084 µmol/L, the determination coefficient of the validation set was 0.8686, and the RMSEP was 5.4320 µmol/L. The results showed that the modeling effect was good in the experiment, the operation was simple and convenient, and the experiment was fast, reliable, and nonpolluting, indicating that the method of detecting Cu2+ using a quantum dot fluorescent probe was feasible.

scholarly journals Modification of Silica Gel with 1,10-Phenanthroline for Cd(II) and Pb(II) Adsorption

KIMIKA ◽  
2013 ◽  
Vol 24 (1) ◽  
pp. 18-24 ◽  
Author(s):  
Ofelia D. Giron ◽  
Rio Carlo M. Lirag ◽  
Susan D. Arco ◽  
Leni L. Quirit
Keyword(s):  
Silica Gel ◽  
Metal Ion ◽  
Dynamic Method ◽  
Modified Silica ◽  
Equilibrium Method ◽  
Dynamic Methods

Silica  gel  was  modified  via  silylation  using  3-chloropropyltrimethylsilane  and functionalization  using  1,10-phenanthroline.  FTIR,  DSC  and  quantitative  SEM-EDX  data were obtained to confirm functionalization. The uptakes of cadmium (II) and lead (II) by the phenanthroline-modified  silica  (Phen-Si)  were  determined  using  equilibrium  and  dynamic methods.  For  the  equilibrium  method,  percent  adsorbed  for  5  to  200  ppm  metal  ion solutions  ranged  from  0  %  to  93.2  %  (for  Cd)  and  from  81.6  %  to  95.2  %  (for  Pb)  The maximum  uptake  of  Phen-Si  is  91.89  mg  Pb/g  silica  and  93.06  mg  Cd/g  silica  for  the equilibrium method while for the dynamic method, maximum uptake was 25.65 ± 6.52 mg Pb/g silica and 17.68 ± 2.33 mg Cd/g silica.

scholarly journals A cocktail of 165Er(iii) and Gd(iii) complexes for quantitative detection of zinc using SPECT and MRI

2018 ◽  
Vol 54 (55) ◽  
pp. 7597-7600 ◽  
Author(s):  
Kyangwi P. Malikidogo ◽  
Isidro Da Silva ◽  
Jean-François Morfin ◽  
Sara Lacerda ◽  
Laurent Barantin ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Metal Ion ◽  
Quantitative Detection ◽  
Zinc Determination

Quantitative zinc determination by nuclear and MR imaging using two Ln3+ complexes, including purified 165Er3+, indispensable for metal ion quantification.

scholarly journals Magnetic, Fluorescence and Transition Metal Ion Response Properties of 2,6-Diaminopyridine Modified Silica-Coated Fe3O4 Nanoparticles

Molecules ◽  
2016 ◽  
Vol 21 (8) ◽  
pp. 1066 ◽  
Author(s):  
Yunhui Zhai ◽  
Ruijuan Song ◽  
Changhu Zhang ◽  
Qun He ◽  
Quan Han ◽  
...  
Keyword(s):  
Transition Metal ◽  
Fe3o4 Nanoparticles ◽  
Metal Ion ◽  
Modified Silica ◽  
Transition Metal Ion ◽  
Response Properties

scholarly journals Coating of L-Arginine Modified Silica on Magnetite through Two Different Sol-Gel Routes

2017 ◽  
Vol 17 (2) ◽  
pp. 256 ◽  
Author(s):  
Amaria Amaria ◽  
Suyanta Suyanta ◽  
Nuryono Nuryono
Keyword(s):  
Functional Groups ◽  
Sodium Silicate ◽  
Magnetite Nanoparticles ◽  
Metal Ion ◽  
Sol Gel ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Amino Groups ◽  
Modified Silica ◽  
Metal Ion Removal

In this research, magnetite coated with L-arginine modified silica (Fe3O4/SiO2-GPTMS-Arg) has been synthesized through a sol-gel process at a room temperature in two Routes. In Route 1, a precursor of sodium silicate solution (source of SiO2), 3-glycidoxypropyltrimethoxysilane (GPTMS) as a coupling agent and L-arginine (Arg) as the source of functional groups were added sequentially to magnetite nanoparticles (Fe3O4). Gelling was carried out by adding HCl solution dropwise to the mixture to reach pH of 7.0. The product was washed with water and ethanol and then dried at 65 °C for 1 day. In Route 2, sodium silicate solution was added to a mixture of GPTMS and L-arginine, and then the sol obtained was added into magnetite nanoparticles. The results were characterized with FTIR spectroscopy, X-ray diffraction, atomic absorption spectroscopy and volumetric method to identify functional groups, crystal size, iron ions released and amino groups content, respectively. The results showed that Fe3O4/SiO2-GPTMS-Arg has been successfully synthesized through both two routes. Route 1, however, gave product of Fe3O4/SiO2-GPTMS-Arg more stable and more content of amino groups than Route 2. The presence of amino groups leads to the application of the product for metal ion removal from aqueous solution.

scholarly journals THERMODYNAMIC OF Mg(II), Cd(II), AND Ni(II) ADSORPTION ON SULFONIC MODIFIED SILICA GEL

2010 ◽  
Vol 5 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Choiril Azmiyawati ◽  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Silica Gel ◽  
Metal Ion ◽  
Ion Concentration ◽  
Chemical Adsorption ◽  
Modified Silica ◽  
Adsorption Parameters ◽  
Modified Silica Gel ◽  
Batch System ◽  
Before And After ◽  
The Difference

Silica gel modified with 4-amino-5-hydroxy-2,7-naphtalenedisulphonate (SG-SO3-) has been applied for adsorption of Mg(II), Cd(II), and Ni(II) in aqueous medium. In addition, three thermodynamic parameters i.e. capacity, adsorption constant and energy of adsorption were calculated. Adsorption was conducted in a batch system and metal ion remaining in the solution was determined by atomic adsorption spectrophotometry (AAS). The amount of adsorbed metal ions was calculated from the difference of metal ion concentration before and after interaction. Adsorption parameters i.e. capacity (ns2), constant (b), and energy (E) of adsorption were calculated using the equation of Langmuir isotherm. Results showed that ns2 for Mg(II), Cd(II), and Ni(II) on the adsorbent were 4.67 x 10-4, 1.19 x 10-4, and 0.13 x 10-4mol g-1, respectively. The values of b for Mg(II), Cd(II), and Ni(II) were 49.35 x 105, 173.46 x 105, and 181.12 x 105 g-1, respectively. Furthermore, it was found that E for all metal ion investigated was in the range of 26-30 kJ/mol, indicating the involvement of chemical adsorption.  

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