No abstract available

[en] The development method for uranyl ion determination by the optimization of chemical reaction and instrumental parameters is shown. This method is based on preconcentration stage, where in adsorptive accumulation of metallic complex in a static electrode is presented. (author)

No abstract available

No abstract available

[en] In medium of pH=1, vanadium(V) forms a 1 : 1 cationic complex with PAR, the instability constant of the complex being pK=5.6. In the presence of hydrogen peroxide a 1 : 1 : 1 mixed-complex develops which is uncharged. The molar absorptivity of the complex (epsilon₅₄₀=1.28x10⁴1xmole^-1xcm^-1) provides a possibility for the spectrophotometric determination of 1-65 μM hydrogen peroxide. (author)

No abstract available

No abstract available

[en] Spent nuclear fuels discharged from FBTR are being reprocessed in CORAL facility by PUREX process. Determination of uranium in high active raffinate streams involves the use of expensive instruments such as ICP-MS, ICP-AES, IC, Laser Flourimetry etc. But these methods are associated with disadvantages of extensive sample preparation and space constraint. Whereas spectrophotometric determination using chromogenic reagents are associated with lower sensitivity. Hence a cloud point extraction (CPE) studies were carried out to preconcentrate dilute Uranium bearing samples, followed by spectrophotometric determination using Pyridyl azo resorcinol (PAR) as chromogenic reagent. In order to facilitate preconcentration of analytechromogenic reagent i.e. UO₂⁺² - PAR in an aqueous solution of non ionic surfactant (triton X-100) and cationic surfactant CTAB (Cetyl Trimethyl Ammonium Bromide) by CPE, Cloud Point Temperature (CPT) is important. Therefore, study of determination of CPT by using conductivity method was developed. In this method, the variation of conductivity of the above said mixed micellar medium as a function of temperature was studied

[en] Lumogallion IREA and Magneson IREA (at pH 2), 4-(2-pyridylazo)resorcinol and 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (at pH 4,8) were studied fro their possible use for molybdenum(6) determination by adsorption voltammetry. It is found that the determination can be performed by an indirect method, taking into consideration the change in cathodic currents of the reagents. The limits of molybdenum(6) detection without preliminary accumulation at a dropping mercury electrode with a drop time of 5s are (1.5-3.9)x10^-7 M, depending on the nature of the reagent

[en] Spectrophotometric characteristics of 4-(2-pyridylazo)-resorcinol (PAR) are studied in a wide pH range depending on the concentration of long-chain surfactants: cetylpyridinium chloride (a cationic surfactant) and OP-10 (a nonionic surfactant). The bathochromic shift of reagent absorption bands is shown. Absorption spectra of the reagent and PAR chelate with cadmium are compared. It is shown that introduction of surfactants studied increases the sensibility of reactions for cadmium. The effect is clearly manifested with introduction of cetyl pyridinium chloride