Development of Extractive Spectrophotometric Determination of Rhodium (III) using Schiffs Base as An Analytical Reagent

Rh (III) was determined by simple, sensitive & feasible spectrophotometric method by using analytical reagent N - (o - methoxy benzaldehyde) 2-aminophenol (NOMBAP) . Elemental analysis was used to characterize synthesized Schiff’s base NOMBAP. Rh (III) is extracted quantitatively (99.66%) by NOMBAP into carbon tetra chloride from an aqueous solution having pH range 5.1 – 5.9. An intense peak at 480 nm (λ max) was observed in the extract of n-amyl alcohol. Beer’s law is obeyed over the concentration range 1.0 – 10.0 µg/ml for Rh (III). The molar absorptivity and Sandel’s sensitivity for Rh - NOMBAP system is 8248.23 dm3 mole-1cm-1and 0.08332 μgcm-2 respectively. Mole Ratio & Job’s Continuous Variation and Method show that the extracted species has composition 1:3 (Rh-NOMBAP). Study has been done for interference by various ions. For determination of Rh (III) in alloy the proposed method has been used.

Comparison of Three Independent Methods of Ampicillin Detection Using Hydrogen Peroxymonosulfate

Three unified procedures have been developed. The possibility of quantitative determination using the methods of kinetiс spectrophotometry, voltammetry, and redox titration of ampicillin (Amp) as a pure substance and in a drug using potassium hydrogen peroxomonosulfate (KHSO5) as an analytical reagent has been shown.

Effect of thiourea on structure, morphology and optical properties of spray deposited CZTS thin films for solar cell applications

<p>Cu2ZnSnS4 (CZTS) films of different Thiorea (SC (NH2)2) molarity were deposited by using simple chemical spray technique at substrate temperature 275°C. Analytical reagent Grade Copper chloride (CuCl2), Zinc chloride (ZnCl2), Tin chloride (SnCl4.5H2O) were used as Cu+ , Zn+ , and Sn+ ion sources respectively and thiourea (SC(NH2)2) (0.02, 0.04 0.06 0.08, and 0.1 M) was used as a Sion source. A set of five CZTS films was deposited using five different molarity of thiourea. The structure, Morphology, Elemental analysis and optical properties of these films were studied using X-ray diffratometer (XRD), Scanning Electron Microscopy (SEM) Energy Dispersive X-ray Analysis (EDX) and UV-Visible spectroscopy techniques respectively. The XRD spectra showed that all films are polycrystalline tetragonal structure with preferential orientation along (112) plane. The calculated crystallite size was increased with increase in thiourea concentration. Variations of optical band gap with thiourea molarity have been investigated using Tauc plots. SEM micrographs exhibits CZTS spherical granules regularly arranged with some void spaces. Purity of deposited films was investigated using EDX analysis. All the CZTS films exhibits higher absorption coefficient (𝛼 &gt; 104) cm-1 and band gap in the reported range (1.2-1.53 eV) can be used as an absorber layer in solar cells.</p>

Synthesis of Aromatic Diketoximes and their Complexes with Nickel Salts

The diketoximes of 4,4'-diacetyldiphenyl oxide and 4,4'-diacetyldiphenyl sulfide were synthesized, the possibility of their use for the synthesis of simple and complex polyesters and polypyrroles, as well as the ability to complex with nickel salts. Organic chemistry used oximes in the 19th century, afterward, as an analytical reagent in the 20th century. Currently, oximes are superior to carbonyl compounds and alcohols in the variety of reactions and the widespread use in synthetic chemistry. Oximes easily turn into other classes of organic compounds – amines, cyano and nitro compounds, carbonyl compounds, heterocyclic compounds, including pyrroles, imidazoles, pyridines, they can be used as suitable compounds with salts of Cu (II), Ni (II), Zn (II), Cd (II), and Co (II). Oximes with complex heterocyclic and aromatic substituents are used as intermediates in fine organic synthesis. It should be noted that oximes have a wide spectrum of biocidal action and are used as anti-inflammatory, antiviral, antimicrobial agents, insecticides. Their versatile biological activity is considered in the preparation of antidepressant, sedative, vasodilator and other drugs [1].

Simultaneous Spectrophotometric Estimation of Azithromycin and Ofloxacin using π-Acceptors as Analytical Reagents

In this study, two sensitive and precise spectrophotometric methods have been developed for the simultaneous determination of azithromycin and ofloxacin in pure mixture and in pharmaceutical binary dosage forms. A new concept of area under curve (AUC) is proposed for simultaneous estimation of two drugs by these methods. Method A involves the use of DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) as analytical reagent and the AUC between 390nm and 690nm for DDQ was used for determination. Method B involves the use of p-CA (p-chloranilic acid: 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone) as an analytical reagent and the AUC between 400nm and 700nm for p-CA was used for determination. The methods developed and construction of calibration curves using two analytical reagents viz., DDQ and p-CA are described. Optical and analytical parameters for the individual and simultaneous determination of azithromycin and ofloxacin using AUC are tabulated. These methods have been validated and compared with HPLC methods in terms of standard deviation, t-test and F-test.

Effect of B2O3 on the Sintering Process of Vanadium–Titanium Magnet Concentrates and Hematite

This work studied the effect of B2O3 (analytical reagent) on the parameters of a sintering pot test, as well as the metallurgical properties and microstructure of the sinter samples, to determine the feasibility of applying solid waste containing B2O3 in vanadium–titanium sintering. The results show that along with B2O3 addition, the mechanical strength of the sinter first increases and then decreases; the maximum strength was found upon the addition of 3.0% of B2O3. The low-temperature reduction and pulverization rate of the vanadium–titanium sinter were also improved, while the start and end temperatures of softening showed a decreasing trend. The microstructure of the sinter was found to change from plate structure to particle and point structure, with uniformly distributed small areas. The sintering pots created by B2O3 addition had low total porosity but a greater pore diameter than pots created without the reagent.