scholarly journals Development of 3H, 14C, 41Ca, 55Fe, 63Ni radiochemical analysis methods in activated concrete samples

2021 ◽  
Author(s):  
Anumaija Leskinen ◽  
Susanna Salminen-Paatero
Keyword(s):  
Thermal Oxidation ◽  
Method Development ◽  
Radiochemical Analysis ◽  
Oxidation Method ◽  
Analysis Methods ◽  
Analysis Of Results ◽  
Radioanalytical Procedures

AbstractDevelopment of 3H, 14C, 41Ca, 55Fe and 63Ni radiochemical analysis methods were carried out independently by two laboratories using both inactivate and activated concrete samples. Two preliminary radioanalytical procedures for the non-volatile radionuclides (41Ca, 55Fe, 63Ni) and one Thermal oxidation method for the volatile radionuclides (3H, 14C) were developed. The difficulties in the method development and analysis of results are discussed.

Synthesis of CuO nanowires on Cu-foil using thermal oxidation method, a novel annealing process

2016 ◽  
Vol 30 (05) ◽  
pp. 1650039 ◽  
Author(s):  
Hosein Eshghi ◽  
Mehdi Torabi Goodarzi
Keyword(s):  
Electron Microscopy ◽  
Thermal Oxidation ◽  
Cupric Oxide ◽  
Band Gap Energy ◽  
Optical Investigation ◽  
Spectra Analysis ◽  
Oxidation Method ◽  
Cuo Nanowires ◽  
Air Atmosphere ◽  
Crystallite Sizes

Cupric oxide (CuO) nanowires (NWs) on Cu-foils were prepared by thermal oxidation method in air atmosphere using two annealing manners (continuous and steps) in the temperature ranges of 400–500[Formula: see text]C and 400–600[Formula: see text]C. Morphology and microstructure of the NWs was studied using field effect scanning electron microscopy (FESEM), X-ray diffractogram (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). Optical reflectance spectrum was used for the optical investigation of the layers. We found the NWs formed have two different morphologies, curved and straight, with diameters between 50 nm and 200 nm and lengths between 5 [Formula: see text]m and 10 [Formula: see text]m. SAED pattern of a single NW revealed as a CuO single crystal with monoclinic structure. The reflectance spectra analysis based on Kubelka–Munk method showed that the band gap energy of the CuO NWs are varying in the range of 1.40–1.47 eV depending on the crystallite sizes of the NWs, a confirmation for the happening of the quantum confined effect in these samples.

Structure and Properties of ZnO: (Cr, N) Film Prepared by Thermal Oxidation Method

2017 ◽  
Vol 9 (4) ◽  
pp. 471-475
Author(s):  
Wenjun Sun ◽  
Kexin Sun ◽  
Lili Wang ◽  
Jinding Sun ◽  
Chengbao Yao ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Structure And Properties ◽  
Oxidation Method

Growth of CuO nanowires on Si substrate by thermal oxidation method and its interfacial delamination mechanism.

2019 ◽  
Vol 2019.27 (0) ◽  
pp. 510
Author(s):  
Issei YANAGISAWA ◽  
Mitsuhiro MATSUNAGA ◽  
Yuki DOI ◽  
Fumiya KIMURA ◽  
Atsushi HOSOI ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Si Substrate ◽  
Oxidation Method ◽  
Interfacial Delamination ◽  
Cuo Nanowires

scholarly journals METHODS OF METOPROLOL ANALYSIS IN DRUGS AND BIOLOGICAL FLUIDS: REVIEW AND SUGGESTIONS

2020 ◽  
Vol 5 (2) ◽  
pp. 88-97
Author(s):  
M. M. Horyn ◽  
L. S. Logoyda
Keyword(s):  
Analytical Method ◽  
High Speed ◽  
High Performance ◽  
Method Development ◽  
High Efficiency ◽  
Biological Fluids ◽  
Dosage Forms ◽  
Pharmaceutical Chemistry ◽  
Components Separation ◽  
Analysis Methods

Background. Analytical method is increasingly implemented into fundamental pharmaceutical chemistry and analysis, considering their high sensitivity, accuracy, specificity and expressiveness. Objective. Metoprolol’s analytical method development was the research goal. Methods. The sources were world recognized journals (1990-2019) and key words used as filter were “metoprolol”, “spectrophotometry” “high-performance liquid chromatography, HPLC”, “quantitative analysis”, “validation”. Results. Chromatographic methods of analysis have the highest specificity and objectivity and allow qualitative and quantitative determination of Active Pharmaceutic Ingredient (API) in combined dosage forms and biological fluids without prior components separation. The main disadvantage of the described API analysis methods is long terms from the beginning of chromatography to API release and specific solvents used as the mobile phase in HPLC. New methods development and selection such chromatographic conditions that provide high speed and high efficiency at lower pressure of the system are essential. Also, the reduction of analysis time is achieved by simplifying the conditions for sample preparation. Conclusions. Analysts are constantly working on developing new analysis methods and their optimization in order to save time and consumables, which also ensures the efficiency of the developed method. There is no monograph on the substance or dosage forms of metoprolol in SPhU. Therefore, some of the developed methods should be suggested for the SPhU monograph, which is important for ensuring pharmacopoeial quality control of medicines in Ukraine.

VALIDASI METODE ANALISIS DAN PENURUNAN KADAR INFUS CIPROFLOKSASIN YANG DIPENGARUHI REAKSI OKSIDASI MENGGUNAKAN HPLC

2017 ◽  
Vol 2 (2) ◽  
pp. 218
Author(s):  
Bekti Nugraheni ◽  
Nafi'ah Nafi'ah ◽  
B Anggoro
Keyword(s):  
Oxidation Reaction ◽  
Method Development ◽  
Solution Concentration ◽  
Gastrointestinal Infections ◽  
Analysis Methods ◽  
Validation Parameters ◽  
The Matrix ◽  
Sample Application ◽  
Tract Infections ◽  
Precision Test

Validation of analysis methods is conducted on the assay of the antibiotic ciprofloxacin because it is often used in the treatment of urinary tract infections, respiratory tract infections and gastrointestinal infections. This study aimed to determine the validity of an analytical method. Development of methods used in this study were the mobile phase of methanol: aquabidest : 0.1 M phosphate buffer: acetonitrile (80: 10: 5: 5). Then the ciprofloxacin validation was performed. After the methods validation were valid, the assay of ciprofloxacin in infusion was performed to determine the decreased levels which affected by the oxidation reaction of 0, 60, 90, 150 and 180 minutes. The validation parameters in the research were selectivity, accuracy, precision, linearity, LOD and LOQ. Samples were standart ciprofloxacin used for the validation and infusion of ciprofloxacin for the assay on the sample application that was affected by the oxidation reaction. The used of HPLC met the requirements such as HPLC devices Waters e2695 Separations, SunFireTM column C18, and PDA detector and a flow rate of 1.0 mL / min. This study showed that the result was selective, stated with no emergence of peaks in the matrix. HPLC analysis methods on ciprofloxacin meet the acceptance criteria of accuracy % recovery value solution concentration of ≥10 mg / mL are 90-107%. Precision test qualifies % RSD for solution concentrations ≥10 mg / mL is <7.3%. Linearity r ≥0,997 then it can be concluded that the result was qualified. LOD value is 0.2707 µg / mL and the LOQ value is 0.9026 µg / mL. The results of the assay infusion of ciprofloxacin were found that there was a significant decrease in the levels of ciprofloxacin due to the influence of the oxidation reaction

Sign in / Sign up

Export Citation Format

Share Document