[en] The publication contains 9 contributions, of which 4 have been input to INIS. (P.A.)

[en] Extraction of microamounts of Eu³⁺, Am³⁺, Ca²⁺ and Sr²⁺ with a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B) in the presence of substituted bis-diphenylphosphine dioxides was investigated and discussed. It was find that diphenylphosphine dioxides can be used for the extraction of the above metal. The most efficient extraction reagent is bis(diphenylphosphino)methane dioxide. The stability constants of some species formed in the organic phase were calculated. (author)

[en] An autonomous SGD Sniffer was developed for long-term submarine groundwater discharge (SGD) monitoring. The device is equipped with a scintillation detector NaI(Tl) with a multichannel analyzer. The measurement is controlled by an embedded PC. The device is powered by batteries charged from photovoltaic panels and can be used in a remote area without any additional power source. The device detects gamma-lines from ²¹⁴Bi, a grand-grand daughter of ²²²Rn. The gamma spectra are saved as text files and contain also basic diagnostic parameters for the analyzer and batteries. A script for batch processing of the spectra was developed for peak area determination. (author)

[en] Complex species [UO₂(XO₄)n(H₂O)_p]²-²ⁿ (X = S, Se) formation is of importance for geochemical studies (of, e.g., uranium mining and radioactive waste repositories - including safety studies). Speciation studies by Time-resolved Laser-induced Fluorescence Spectroscopy and UV-VIS absorption spectrophotometry led to deconvoluted individual species luminescence and absorption spectra (the former interpreted in terms of adiabatic excitation energy and uranyl group symmetric mode vibrational frequency), luminescence life-times and complex stability constants J3_m (and corresponding enthalpy and entropy from Van't Hoff equation fit). Obtained zero ionic strength extrapolated values log J3_m° for selenate complexes (2.7 + 0.3; 3.1 + 0.6) are smaller than for sulphate complexes, both absorption and luminescence spectra of selenates are similar to sulphate analogs. Preliminary study on temperature dependence of luminescence life-times has been started here for the [UO₂(H₂O)₅]²⁺ species too. (author)

[en] Determination of sodium content in NIST standard reference materials (SRM) SRM 1547 and SRM 1515 in recent years yielded values higher than NIST certified values. Similarly, increased values were published for SRM 1547 by several laboratories, however, published sodium values SRM 1515 are in general in agreement with the certified value. Additional analysis of SRM 1547 and SRM 1515 using NIST SRM 3152a Sodium Standard Solution as a calibrator confirmed increased Na values. Inhomogeneity indicating external contamination of the stock material was not found. Moreover, increased Na value was also determined for freshly opened bottle of SRM 1547 material. Analysis of the historical material A-2 from our archive, which is identical with SRM 1515 and was distributed by NIST prior to the SRM 1515 certification and stored in a polyethylene vial, yielded a value in agreement with the certified value. A hypothesis was formulated that sodium in SRM 1547 and SRM 1515 materials could have been increasing after certification, perhaps due to the release of sodium from the glass bottle. (author)