Development of a pH titration method for the simultaneous determination of uranium, nitrate and free-acid in the feed solution of the sol-gel process of nuclear fuel fabrication

1998 ◽  
Vol 238 (1-2) ◽  
pp. 33-41 ◽  
Author(s):  
R. V. Kamat ◽  
R. M. Sawant ◽  
H. R. Mhatre ◽  
N. K. Chaudhuri ◽  
V. N. Vaidya
Keyword(s):  
Free Acid ◽  
Sol Gel ◽  
Feed Solution ◽  
Titration Method ◽  
Ph Titration ◽  
Fuel Fabrication ◽  
Sol Gel Process ◽  
Uranium Nitrate ◽  
Nuclear Fuel Fabrication

Voltammetric determination of aluminum(III) using a reagentless sensor fabricated by sol–gel process

2004 ◽  
Vol 99 (2-3) ◽  
pp. 468-473 ◽  
Author(s):  
Junwei Di ◽  
Shuping Bi ◽  
Tianyu Yang ◽  
Ming Zhang
Keyword(s):  
Sol Gel ◽  
Voltammetric Determination ◽  
Sol Gel Process

Effect of feed solution composition and heat treatment conditions on the morphology of uranium oxide microspheres prepared by sol–gel process

2006 ◽  
Vol 359 (1-2) ◽  
pp. 80-92 ◽  
Author(s):  
N. Kumar ◽  
Y.R. Bamankar ◽  
K.T. Pillai ◽  
S.K. Mukerjee ◽  
V.N. Vaidya ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Uranium Oxide ◽  
Sol Gel ◽  
Feed Solution ◽  
Solution Composition ◽  
Treatment Conditions ◽  
Sol Gel Process

A nine-point pH titration method to determine low-concentration VFA in municipal wastewater

2011 ◽  
Vol 63 (4) ◽  
pp. 583-589 ◽  
Author(s):  
Hainan Ai ◽  
Daijun Zhang ◽  
Peili Lu ◽  
Qiang He
Keyword(s):  
Municipal Wastewater ◽  
Treatment Process ◽  
Synthetic Wastewater ◽  
Titration Method ◽  
Wastewater Treatment Process ◽  
Ph Titration ◽  
Low Concentration ◽  
Real Wastewater

Characterization of volatile fatty acid (VFA) in wastewater is significant for understanding the wastewater nature and the wastewater treatment process optimization based on the usage of Activated Sludge Models (ASMs). In this study, a nine-point pH titration method was developed for the determination of low-concentration VFA in municipal wastewater. The method was evaluated using synthetic wastewater containing VFA with the concentration of 10–50 mg/l and the possible interfering buffer systems of carbonate, phosphate and ammonium similar to those in real municipal wastewater. In addition, the further evaluation was conducted through the assay of real wastewater using chromatography as reference. The results showed that the recovery of VFA in the synthetic wastewater was 92%–102 and the coefficient of variance (CV) of reduplicate measurements 1.68%–4.72%. The changing content of the buffering substances had little effect on the accuracy of the method. Moreover, the titration method was agreed with chromatography in the determination of VFA in real municipal wastewater with R2= 0.9987 and CV =1.3-1.7. The nine-point pH titration method is capable of satisfied determination of low-concentration VFA in municipal wastewater.

EFFECT OF ANNEALING TEMPERATURE ON THE OPTICAL AND STRUCTURAL PROPERTIES OF DIP-COATED Al2O3 THIN FILMS PREPARED BY SOL–GEL ROUTE

2005 ◽  
Vol 12 (05n06) ◽  
pp. 793-797 ◽  
Author(s):  
F. E. GHODSI ◽  
M. MAFAKHERI ◽  
A. NOVINROOZ
Keyword(s):  
Thin Films ◽  
Structural Properties ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Sol Gel Process ◽  
Dip Coating Technique

Thin films of Al 2 O 3 were prepared by the sol–gel process. Dip-coating technique was used for deposition of the Al 2 O 3 thin films onto glass substrates. Optical and structural properties of the films were investigated with respect to the annealing temperature (100–500°C). The structure of these films was determined by X-ray diffraction (XRD). Scanning electron microscopy (SEM) was performed for the analysis of surface morphology. For determination of the optical constants of Al 2 O 3 thin films, UV-Visible spectrophotometry measurements were carried out. Annealing temperature affects the structural and optical properties of the Al 2 O 3 thin films. The refractive index and extinction coefficient of the films at 550 nm wavelength increase from 1.56 to 1.66, and from 3.41 × 10-5 to 5.54 × 10-5, respectively while optical band gap and thickness of the films decrease from 4.15 eV to 4.11 eV, and 360 nm to 260 nm, respectively, by increasing annealing temperature from 100°C to 500°C.

scholarly journals Multinuclear Magnetic Resonance Study on Aluminium Sec-butoxide Chelated with Ethyl Acetoacetate in Various Amounts

2019 ◽  
Vol 92 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Stanislav Kurajica ◽  
Gregor Mali ◽  
Vilko Mandić ◽  
Iva Minga
Keyword(s):  
Ethyl Acetoacetate ◽  
Sol Gel ◽  
Gain Control ◽  
Spectroscopic Techniques ◽  
27Al Nmr ◽  
One Dimensional ◽  
Sol Gel Process ◽  
Rapid Hydrolysis ◽  
First Time

Reactive aluminum alkoxide (ASB, aluminium sec-butoxide) was chelated using β-diketone (EAA, ethyl acetoacetate) in order to gain control over rapid hydrolysis in the course of the sol-gel process. Derived chelates were analysed using several NMR spectroscopic techniques: one-dimensional 1H, 13C, 27Al NMR and two-dimensional COSY, HSQC and DOSY. The NMR analysis enabled identification of the formed chelate species, as well as determination of their quantitative relationships. Several complexation products were observed: tris-chelated monomer, Al(EAA)3, bis-chelated dimmer, Al2(OnBu)4(EAA) 2, tris-chelated dimmer, Al2(OnBu)3(EAA)3, tetra-chelated dimmer, Al2(OnBu)2(EAA)4, and monochelated trimer, Al3(OnBu)8(EAA). Of the formed oligomer compounds, this is the first evidence of Al2(OR)3L3 in any alkoxide and β-ketoester or β-diketone combination. Aluminium sec-butoxide and ethyl acetoacetate complexes Al2(OnBu)4(EAA) 2 and Al2(OnBu)2(EAA)4 were also observed for the first time. With the increase of the EAA/ASB ratio the coordination of aluminium shifts towards six, whereas above the EAA/ASB ratio of 2.5 solely six-coordinated aluminium exists.

The polarography of glycine metal complexes and the determination of stepwise formation constants

1961 ◽  
Vol 14 (4) ◽  
pp. 562 ◽  
Author(s):  
DP Mellor ◽  
HA McKenzie
Keyword(s):  
Metal Complexes ◽  
Formation Constants ◽  
Substantial Agreement ◽  
Titration Method ◽  
Ph Titration ◽  
Polarographic Behaviour ◽  
The Stability ◽  
Titration Technique ◽  
Stepwise Formation

The polarography of metal-glycine complexes has been studied with a view to assessing its usefulness in measuring the stability of metal complexes, especially the stepwise formation constants. It is shown that the equation derived by De Ford and Hume (1951) may be transformed in a way that makes possible the calculation of both overall and stepwise stoichiometric constants from experimental data obtained with solutions of constant ionic strength. Problems in the use of maximum suppressors and buffer ions are considered. Stoichiometric stepwise stability constants for the glycine complexes of copper(II) and cadmium(II) have been determined : (i) polarographically and (ii) by the pH- titration method of Irving and Rossotti (1954a, 1954b). The values obtained by the two methods agree reasonably well. Problems of hydrolysis and precipitation arise with t8he lead(II) complexes. The zinc(II) complexes exhibit anomalous polarographic behaviour. The reasons for this behaviour are briefly discussed. Although the polarographic technique is capable of yielding values for step constants in substantial agreement with those obtained by the pH-titration technique, there is evidence that it in not so generally applicable as the latter.

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