[en] A method for the determination of Cu and Ni in high purity Eu₂O₃ by ion chromatography is described. The rare earth matrix is removed by means of preparations column with cation exchange resin. The use of pyridine-2,6-dicarboxylic acid (PDCA) as an eluent chelator in ion chromatography brings about ionic change differences between the lanthanide and the transition-metal complexes, and this effect permits the separation of the transition-metals while the lanthanides are retained at the top of the column. Finally the transition-metals are separated from the rare earth elements by gradient eluent. Post-column reaction with 4-(2-pyridylazo)-resorcinol(PAR) permits photometric detection at 520 nm. Detection limits for Cu and Ni range from 50 to 300 μg/ml with 150 ul sample loop. The precision of the method is about +-5% at 120 ng/ml of Cu and 140 ng/ml of Ni respectively. This method can be also applied to determine non-rare earth impurities for the other highly pure rare earth elements

[en] The determination of Na⁺ and k⁺ ions in the high-level liquid waste is investigated using ion chromatography. In order to protect the low capacity ion exchange resin in single column IC and remove the transition metal as well as other heavy metal ions that are contained in liquid waste, the pretreatment column with EDTA chelating resin is used. Those impurity metal ions are strongly absorbed by EDTA chelating resin and 100% of Na⁺ and K⁺ ions in the solution are eluted. The ability of the decontamination of EDTA chelating resin is satisfactory. The sample of the high-level liquid waste is diluted appropriately, then an aliquot of the sample is passed through the pretreatment column with EDTA chelating resin, the eluate is analysed by single column ion chromatography. The precision of this method is better than 5% for the determination of Na⁺ and K⁺ ions (at μg· ml^-1 level)

[en] In this paper a radioanalytical method for substoichiometric multielement group separation is studied and applied to reactor neutron activation analysis. Zinc diethyldithiocarbamate Zn(DDC)₂ is used as the chelating agent. By a single extraction gold is separated quantitatively, and copper substoichiometrically at the same time, while sodium is not extracted and remains in aqueous phase. These elements are separated from 2N H₂SO₄ and 0.1 N HClO₄ medium. This separation method is applied to the activation analysis of biological materials. Copper and gold are separated from interfering elements with high activity (principally ²⁴Na) and determined accurately with high sensibility. The method proves very suitable for the determination of copper, sodium and gold, the principal toxic elements in the semiconductor. (Author)

[en] Two mathematical statistic methods for testing the homogeneity of environmental soil sample, i.e. classical variance analysis and 'degree of inhomogeneity' method are introduced. The soil samples were analysed by instrumental neutron activation analysis (INAA). The elements determined were Th, La, Cr, Fe, Co. The result of 'degree of inhomogeneity' method is discussed in comparison with classical variance analysis

[en] A new mercury standard for reactor neutron activation is prepared by using sulfhydryl cotton as a support to hold mercury. The preparation of cotton matrix is studied. It is compared with the mercury standard prepared by other methods. It's advantage is to obviate the loss of meacury in the preparetion and irradiation of the standard and to prepare easily. The mercury content is determined by neutron activation analysis with the mercury standard in U. S. NBS SRM-1645 and Japan NIES No. 2 Soil Standard Reference Material. Better precision and accuracy are obtained

[en] A sealed ion chromatograph is developed. It is divided into two parts: an internal box and an outer box. All parts contacted with radioactive solution are placed in internal box, the internal box is put in a closed protective glove box. The operation in internal box such as automatic sampling, switching both anion and cation analytical system and automatic reproduction of suppressor is controlled by an automatic system in outer box. The internal box is made of plastic material. The operation and observation are very convenient, because the operational parts and tube-lines are in the front of the internal box. All parts of instrument in the box are separated from each other, and the replacement of the parts is very easy. The instrument is suitable for determining of anions, alkali metals and alkali earth metals in nuclear fuel reprocessing solution and high-level liquid waste. It's noise is less than full scale 1% and the drift of baseline is better than full scale 2%. The detectable limits of the instrument are 15 μg·L^-1 and 50 μg·L^-1 for Cl^- and Na⁺, respectively. The linear relation coefficients are better than 0.995 for the calibration curves of the anions and cations

[en] The determination of F^-, Cl^-, NO₂^- and PO₄^3- ions in the presence of a large quantities of NO₃^- ion is investigated in detail. In order to remove harmful and a great amount of cations that are contained in the liquid waste, especially the transition metal and other heavy metal ions, the pretreatment column with cation exchange resin is used; The sample is diluted with the eluent to suppress the negative peak of water; The effect of a large amount of NO₃^- on the measurement of other anions are eliminated by choosing proper dilution times of sample. Because the method possesses higher sensitivity and allows much more dilution times of sample to decrease radiation, it is very useful for the analysis of high level waste. F^-, Cl^-, No₂^- and PO₄^3- are recovered quantitatively in the method. The precision of the method is better than 6% for the determination of F^-, Cl^-, No₂^-and PO₄^3-

No abstract available

[en] A combustion/ion chromatographic method has been studied for the sensitive determination of chlorine in graphite. A graphite sample was burnt at 900degC in a silica reaction tube at an oxygen flow rate of 200 ml/min. Chlorine evolved was absorbed in 20 ml of a 0.1 mM sodium carbonate solution. The solution was evaporated to dryness. The residue was dissolved with a small volume of water. Chlorine in the solution was determined using ion chromatography. The method was applied to JAERI graphite certified reference materials and practical graphite materials. The detection limit was about 0.8 μgCl/g for a 2.0 g sample. The precision was about 2.5% (relative standard deviation) for samples with chlorine content of 70 μg/g level. The method is also usable for coal samples. (author)

[en] Analytical methods for 25 cations, 5 anions, as well as total residue, total oxide, density and free acid are developed. The HLLW sample taken from reprocessing plant was analysed by 18 different methods. Two or more methods with different principles are used to check the accuracy for the major chemical composition, and the obtained results are agreed well. The complete and accurate data are provided for further HLLW treatment and disposal