No abstract available

[en] In the Nuclear Research Laboratory of the Mongolian State University we have been using the American Perkin Elmer corporation's equipment which is called ''The Atomic Absorption Spectro-Photometer'' (AAS) since 1981. Our task was to connect Perkin Elmer equipment to an IBM/PC compatible computer and to automate the manual operations. We describe a new design of the instruments which allows us to connect the Perkin Elmer equipment ot the IBM PC/XT type computer and consequently to automate its manual operations that are necessary during the measurements of each sample on it. A timing diagram of date signals which should appear on the AAS display and the general principle to operate of the instrument have been reviewed. Finally authors draw your attention to the opto-isolator which is necessary to protect the Perkin Elmer equipment, the IBM/PC/XT computer and the new equipment in case of any accident. In other words the new equipment is connected by the optical isolator link to the computer. 3 figs

[en] Published in summary form only

[en] Instrumentation was designed and constructed for automatic control of plutonium by molecular absorption spectrophotometry, on behalf of the reprocessing facilities, to meet two objectives: on-line measurement, of the valency state of plutonium, on by-pass, with the measured concentration covering the process concentration range up to a few mg.l^-1; laboratory measurement of plutonium adjusted to valency VI, with operation carried out using a preparative system meeting the required containment specifications. For this two objectives, the photometer, optical cell connections are made by optical fibers resistant to β, γ radiation. Except this characteristic the devices are different according to the quality required for result

[en] The reaction between silver (I) and thiomicher's ketone (TMK) was sensitive at pH 5 and 8 in the presence of non-ionic or anion surfactant. We studied the complex solution and determined the properties by beta-correction spectrophotometry, which included the complex ration and the stability constant of the complex. The results showed that complex Ag(TMK) was formed in the presence of alkylphend ethoxylates (emulsifier OP) and Ag(TMK)₂ was formed in the presence of sodium dodecyl benzene sulfonate (SDBS). Their real absorptivities are as follows: ε_Ag(TMK)⁵⁴⁰=5.23 x 10⁴, ε_Ag(TMK)2⁵⁵⁵=1.05 x 10⁵ Lmol^-1cm^-1 both at pH 5 and ε_Ag(TMK)2⁵⁵⁵=7.52 x 10⁴ lmol^-1cm^-1 at pH 8. The stability constant of complex Ag(TMK) was equal to 1.23 x 10⁵ at pH 5, and that of Ag(TMK)₂ 8.29 x 10⁹ at pH 1.15 x 10¹¹ at pH 8

[en] An introduction to the uses and importance of pyrazole-5-one and -2- pyrazoline derivatives, it also contains a concise review of methods of determination for these derivatives, as well, basis of amplification reactions, spectrophotometer, diazotization and polarography. The second chapter deals with determination of some pyrazole-5- one and -2-pyrazoline derivatives by titrimetric method in combination with amplification procedures.(40 tabs., 8 figs., 103 refs.)

[en] A photoelectric device is described which is intended for accurate fixation of the sun chromosphere image on the spectrograph slit. The optical part of the device consists of two glass plates - a movable one and a stationary. The component of the image atmospheric shift in the direction perpendicular to the plate axis of rotation is constantly compensated by a turn of the movable plate, so that one and the same place of chromosphere is retained on the slit. In case of the stationary plate inclination the follow-up device compensates the photosphere portion shift caused by the inclination by shifting the whole image to the opposite direction. Then another portion of chromosphere occurs against the slit. The device compensates the image jitter at a frequency of up to 8 Hz. The device error for retaining the image is +-0.5

[en] A method for the simulation determination of inorganic As(III) and As(V) is described, which involves arsine generation, measurement of the molecular absorption of arsine in the gas phase at 190 nm and quantification od As(III) and As(V) based on different heights and areas of absorbance versus time profiles of arsine generated from both inorganic species. The limits of detection were 0.5 μg of As(III) and 3 μg of As(V) in a sample volume of 1 ml. An interference study for both species was made and the method was applied to the determination of As₂O₃ and As₂O₅ in a standard glass sample. (author). 29 refs.; 3 figs.; 5 tabs

[en] The absorption spectra of Pu in stock solution were measured using a UV-Vis-NIR spectrophotometer after dissolving PuO₂ with HNO₃, HF and HCIO₄. The spectroscopic characteristics of Pu (III, IV, VI) in acidic, neutral and alkali media were investigated. Also, the intensities and position of major peaks for Pu(VI) were observed with increasing acidic and alkali concentration. The variation of oxidation states of Pu(VI) with an adding reducing reactant was investigated in HCI and NaOH medium

[en] A support made of metal to be used in a glass cell for low temperature is projected and constructed in a spectrophotometer Perkin-Elmer 180