Determination of photostability and photodegradation products of moxifloxacin in the presence of metal ions in solutions and solid phase. Kinetics and identification of photoproducts

2012 ◽  
Vol 11 (2) ◽  
pp. 351-357 ◽  
Author(s):  
Urszula Hubicka ◽  
Jan Krzek ◽  
Barbara Żuromska ◽  
Maria Walczak ◽  
Marek Żylewski ◽  
...  
Keyword(s):  
Metal Ions ◽  
Solid Phase ◽  
Photodegradation Products ◽  
Solid Phase Kinetics

scholarly journals The Solid Phase Extraction of Some Metal Ions Using Palladium Nanoparticles Attached to Silica Gel Chemically Bonded by Silica-Bonded N-Propylmorpholine as New Sorbent prior to Their Determination by Flame Atomic Absorption Spectroscopy

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
M. Ghaedi ◽  
M. Rezakhani ◽  
S. Khodadoust ◽  
K. Niknam ◽  
M. Soylak
Keyword(s):  
Electron Microscopy ◽  
Metal Ions ◽  
Silica Gel ◽  
Solid Phase ◽  
Food Samples ◽  
Natural Food ◽  
Modified Silica Gel ◽  
Flame Atomic Absorption ◽  
Relative Standard

In this research at first palladium nanoparticle attached to a new chemically bonded silica gel has been synthesized and has been characterized with different techniques such as X-ray diffraction (XRD), fourier transform infrared (FT-IR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Then, this new sorbent (chemically modified silica gel with N-propylmorpholine (PNP-SBNPM)) was efficiently used for preconcentration of some metal ions in various food samples. The influence of effective variables including mass of sorbent, flow rate, pH of sample solutions and condition of eluent such as volume, type and concentration on the recoveries of understudy metal ions were investigated. Following the optimization of variables, the interfering effects of some foreign ions on the preconcentration and determination of the investigated metal ions described. At optimum values of variables, all investigated metal ions were efficiently recovered with efficiency more than 95%, relative standard deviation (RSD) between 2.4 and 2.8, and detection limit in the range of 1.4–2.7 ng mL−1. The present method is simple and rapidly applicable for the determination of the understudied metal ions (ng mL−1) in different natural food samples.

Colorimetric Determination of Metal Ions Using Smartphone

2018 ◽  
Vol 769 ◽  
pp. 235-241
Author(s):  
Eldar V. Urazov ◽  
Maria A. Gavrilenko ◽  
Mikhail K. Belikov
Keyword(s):  
Metal Ions ◽  
Color Change ◽  
Solid Phase ◽  
Colorimetric Determination ◽  
Phase Extraction ◽  
Colorimetric Analysis ◽  
Digital Photo ◽  
Visual Color ◽  
Polymethacrylate Matrix

The visible sensing determination with color change after solid phase extraction using polymethacrylate matrix and colorimetric smartphone-based technique have been highlighted. The smartphone-based method based on digital photo of transparent polymer optode for metal ions determination is proposed for diapason 0.02-60 mg/L. The optical property of polymer matrix enables a visual color change during its reaction with the analytes. Proposed method is compared with spectrophotometric and colorimetric analysis.

scholarly journals SCHEMES OF SOLID-PHASE SPECTROPHOTOMETRIC ANALYSIS OF FOOD OBJECTS

2018 ◽  
Vol 3 ◽  
pp. 33-40
Author(s):  
Elizaveta Kostenko ◽  
Elena Butenko ◽  
Larisa Arseneva
Keyword(s):  
Detection Limit ◽  
Metal Ions ◽  
Solid Phase ◽  
Food Products ◽  
Ion Exchangers ◽  
Standard Samples ◽  
Limit Values ◽  
Standard Methods ◽  
Relative Standard

The aim of research is development of approaches to the development of schemes for microelement analysis of food objects. This will make it possible to monitor food quality by simple and affordable methods in factory laboratories. Based on data on the immobilization of dyes on ion exchangers and on the interaction of metal ions or their complexes with immobilized dyes, solid-phase spectrophotometric (SPS) and photometric methods for determining metal ions in food technology, biotechnology and the environment have been developed. Techniques are sensitive. High distribution coefficients (D³104 cm3/g) of metal ions help to reduce the detection limit when using immobilized dye as compared to the reaction in solution. Based on the detection limit values (DLV), the proposed sorption-spectrophotometric methods for determining metal ions are second only to the atomic absorption (AAS) determination of Cd (II) and Hg (II) ions and the polarographic determination of Cd (II) ions. However, the proposed methods for the determination of these metal ions are sufficient for the determination of Cd (II) and Hg (II) ions in food products at the MPC level. In the case of determination of Pb (II), Zn (II), Cu (II), Fe (III) ions, the developed methods have advantages over standard methods for determination of metal ions in food products, since they make it possible to determine these ions at a level ≤0.1…0.5 MPC; Ion exchangers with immobilized dyes and solid-phase spectrophotometric determination methods with their participation are environmentally safe, since they do not require the use of toxic organic reagents; are simple in execution and economically advantageous because of the low cost of used materials and reagents. The correctness of the results of the determination by the developed methods is proved: by comparison with the results of determinations on standard methods at various analysis objects using the method of additives, standard samples. The relative standard deviation of the developed SPS determination procedures does not exceed 0.10, which indicates satisfactory reproducibility of the results. The developed methods exceed the majority of standard and best analogs, known from the literature, for sensitivity and selectivity. The used methods of analysis are characterized by the simplicity of the experiment, ecological safety, do not require special expensive equipment, highly qualified personnel and a stationary laboratory.

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