共查询到20条相似文献,搜索用时 687 毫秒
1.
Extraction of microamounts of strontium and barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of dibenzo-24-crown-8 (DB24C8, L) has been investigated. The equilibrium data have been explained assuming
that the species HL+, HL2
+, ML2+, ML2
2+ and MHL2
3+ (M2+ = Sr2+, Ba2+) are extracted into the organic phase. The values of extraction and stability constants of the complexes in nitrobenzene
saturated with water have been determined. It was found that the stability constants of the cationic complex species BaL2+ and BaL2
2+ in the considered nitrobenzene medium are somewhat higher than those of the corresponding complexes SrL2+ and SrL2
2+. 相似文献
2.
E. Makrlík P. Vaňura P. Selucký 《Journal of Radioanalytical and Nuclear Chemistry》2010,284(1):137-142
Extraction of microamounts of strontium and barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B?) in the presence of dibenzo-24-crown-8 (DB24C8, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, HL2 +, ML2+, ML2 2+ and MHL2 3+ (M2+ = Sr2+, Ba2+) are extracted into the organic phase. The values of extraction and stability constants of the complexes in nitrobenzene saturated with water have been determined. It was found that the stability constants of the cationic complex species BaL2+ and BaL2 2+ in the considered nitrobenzene medium are somewhat higher than those of the corresponding complexes SrL2+ and SrL2 2+. 相似文献
3.
Z. Valentová P. Vaňura E. Makrlík 《Journal of Radioanalytical and Nuclear Chemistry》2006,267(2):471-475
Summary Extraction of microamounts of strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of dicyclohexyl-18-crown-6 (DCH18C6, L) has been investigated. The equilibrium data have been explained
assuming that the complexes HL+, HL, SrL2+and SrL are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene
saturated with water have been determined. 相似文献
4.
E. Makrlík P. Vaňura P. Selucký 《Journal of Radioanalytical and Nuclear Chemistry》2008,277(3):549-554
Extraction of microamounts of calcium, strontium and barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of dibenzo-18-crown-6 (DB18C6, L) has been investigated. The equilibrium data have been explained assuming
that the complexes HL+, ML2+, ML22+ and MHL23+ (M2+ = Ca2+, Sr2+, Ba2+) are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated
with water have been determined. 相似文献
5.
P. Vaňura E. Makrlík M. Vobecký; 《Journal of Radioanalytical and Nuclear Chemistry》2003,257(2):437-440
Extraction of microamounts of strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of 12-crown-4 (12C4,L) has been investigated. The equilibrium data have been explained assuming that the complexes HL+, HL2
+, SrL2+ and SrL2
+2- are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined. 相似文献
6.
E. Makrlík P. Vaňura P. Selucký V. Kašička 《Journal of Radioanalytical and Nuclear Chemistry》2010,283(1):95-100
Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of 2,3-naphtho-15-crown-5 (N15C5, L) has been investigated. The equilibrium data have been explained assuming
that the complexes HL+, HL2
+, CaL2+, CaL2
2+ and SrL2
2+ are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated
with water have been determined. It has been found that in water saturated nitrobenzene the stability constant of the SrL2
2+ cationic complex species is substantially higher than that of the complex CaL2
2+. 相似文献
7.
E. Makrlík P. Vaňura P. Selucky 《Journal of Radioanalytical and Nuclear Chemistry》2010,285(2):383-387
Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of 1,2-(diphenylphosphino)ethylene dioxide (DPPEDO, L) has been investigated. The equilibrium data have
been explained assuming that the species HL+, HL2
+, CaL2
2+, CaL3
2+, CaL4
2+, SrL2
2+ and SrL3
2+ are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in nitrobenzene
saturated with water have been determined. In the considered nitrobenzene medium, it was found that the stability constants
of the CaL
n
2+ complexes, where n = 2, 3 and L is DPPEDO, are somewhat higher than those of the corresponding complex species SrL
n
2+. 相似文献
8.
Summary Extraction of microamounts of barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of dibenzo-18-crown-6 (DB18C6, L) has been investigated. The equilibrium data have been explained assuming
that the complexes HL+, BaL2+, BaL, BaHL3+and BaHL are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene
saturated with water have been determined. 相似文献
9.
P. Vaňura V. Jedináková-Křížová 《Journal of Radioanalytical and Nuclear Chemistry》2004,260(3):679-681
The equilibrium data and the typical maxima concerning the dependences of the Sr distribution ratios on the analytical concentration
of p-nonylphenylnonaethylene glycol in the system under study can be explained assuming that the HL+, HL2
+, SrL2+ and SrL2
2+ particles are extracted into the nitrobenzene phase. The values of the corresponding extraction and stability constants of
the extracted species in nitrobenzene saturated with water have been determined. The possibility of the use of this system
for the determination of nonionic surfactants by the method of concentration dependence of strontium is discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
10.
E. Makrlík P. Vaňura P. Selucký 《Journal of Radioanalytical and Nuclear Chemistry》2008,275(2):285-289
Extraction of microamounts of calcium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of dibenzo-21-crown-7 (DB21C7) and dibenzo-24-crown-8 (DB24C8) has been investigated. The equilibrium data
have been explained assuming that the complexes HL+, CaL2+, CaL22+ and CaHL23+ (L = DB21C7, DB24C8) are extracted into the organic phase. The values of extraction and stability constants of the species
in nitrobenzene saturated with water have been determined. 相似文献
11.
Z. Valentová P. Vaňura E. Makrlík 《Journal of Radioanalytical and Nuclear Chemistry》1997,224(1-2):45-48
Extraction of85Sr by a nitrobenzene solution of bis-1,2-dicarbollylcobaltate in the presence of 15-crown-5 (15C5, L) has been investigated. The equilibrium data and the typical maxima concerning the dependencies of the Sr distribution ratios on the analytical concentration of 15C5 in the system under study can be explained assuming that the HL+, HL2
+ and SrL2
2+ species are extracted into the nitrobenzene phase. The values of the corresponding extraction and stability constants of the extracted species in nitrobenzene saturated with water have been determined. 相似文献
12.
E. Makrlík P. Vaňura P. Selucky V. A. Babain I. V. Smirnov 《Journal of Radioanalytical and Nuclear Chemistry》2011,288(1):233-238
Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of N,N,N′,N′-tetraisobutyl-2,6-dipicolinamide [T(iBu)DPA, L] has been investigated. The equilibrium data have been explained assuming
that the species HL+, HL2
+, CaL2
2+, SrL2
2+ and SrL3
2+ are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in nitrobenzene
saturated with water have been determined. 相似文献
13.
Extraction distribution of microamounts of strontium in the water-CsCl-15-crown-5 (15C5,L)-nitrobenzene-cesium dicarbollylcobaltate system has been investigated. The equilibrium data have been explained assuming that the CsL+, CsL2
+ and SrL2
2+ complexes are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined. 相似文献
14.
E. Makrlík P. Vaňura P. Selucký I. V. Smirnov V. A. Babain 《Journal of Radioanalytical and Nuclear Chemistry》2011,287(1):335-340
Extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of diphenyl-N,N-dibutylcarbamoylmethyl phosphine oxide (DPDBCMPO, L) has been investigated. The equilibrium data have been explained assuming
that the species HL+,
\textHL2 + {\text{HL}}_{2}^{ + } , CaL2+,
\textCaL 2 2 + {\text{CaL}}_{ 2}^{{ 2 { + }}} ,
\textCaL 3 2 + {\text{CaL}}_{ 3}^{{ 2 { + }}} , SrL2+,
\textSrL 2 2 + {\text{SrL}}_{ 2}^{{ 2 { + }}} ,
\textSrL 3 2 + {\text{SrL}}_{ 3}^{{ 2 { + }}} and
\textSrL 4 2 + {\text{SrL}}_{ 4}^{{ 2 { + }}} are extracted into the organic phase. The values of extraction and stability constants of the cationic complexes in nitrobenzene
saturated with water have been determined. In the considered nitrobenzene medium, it was found that the stability constants
of the complexes CaL2+,
\textCaL 2 2 + {\text{CaL}}_{ 2}^{{ 2 { + }}} and
\textCaL 3 2 + {\text{CaL}}_{ 3}^{{ 2 { + }}} , where L is DPDBCMPO, are somewhat higher than those of the corresponding complex species SrL2+,
\textSrL 2 2 + {\text{SrL}}_{ 2}^{{ 2 { + }}} and
\textSrL 3 2 + {\text{SrL}}_{ 3}^{{ 2 { + }}} . 相似文献
15.
E. Makrlík P. Vaňura Z. Sedláková 《Journal of Radioanalytical and Nuclear Chemistry》2009,280(3):607-611
Extraction of microamounts of strontium and barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of polyethylene glycol PEG 600 (L) has been investigated. The equilibrium data have been explained assuming
that the complexes HL+, H2L2+, ML2+ and MHL3+ (M2+ = Sr2+, Ba2+) are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated
with water have been determined. It was found that in water-saturated nitrobenzene the stability constant of the BaL2+ cationic complex species is essentially higher than that of the complex SrL2+. 相似文献
16.
Extraction of microamounts of strontium and barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of dibenzo-21-crown-7 (DB21C7, L) has been investigated. The equilibrium data have been explained assuming
that the complexes HL+, ML2+, ML22+ and MHL23+ (M2+ = Sr2+, Ba2+) are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated
with water have been determined. 相似文献
17.
E. Makrlík P. Vaňura P. Selucký J. Hálová 《Journal of Radioanalytical and Nuclear Chemistry》2007,274(3):625-629
Extraction of microamounts of strontium and barium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B−1) in the presence of benzo-18-crown-6 (B18C6, L) has been investigated. The equilibrium data been explained assuming that
the complexes HL+, ML2+, ML22+ and MHL23+ (M2+ = Sr2+, Ba2+) are extracted into the organic phase. The values of extraction and stability constants of the species in nitrobenzene saturated
with water have been determined. 相似文献
18.
Summary From extraction experiments and<span style='font-size:12.0pt;font-family:Symbol; mso-bidi-font-family:Symbol'>g-activity measurements,
the extraction constant corresponding to the equilibrium Ba2+(aq)+SrL2+(nb)?BaL2+(nb)+Sr2+(aq) taking place in the two-phase water-nitrobenzene system (L= valinomycin; aq= aqueous phase,</o:p>nb= nitrobenzene phase)
was evaluated as logKex(Ba2+, SrL2+)=1.3. Furthermore, the stability constant of the valinomycin-strontium complex in nitrobenzene saturated with water was calculated
for a temperature of 25 °C: logbnb(SrL2+)=5.4. 相似文献
19.
E. Makrlík P. Vaňura P. Selucký 《Journal of Radioanalytical and Nuclear Chemistry》2013,295(3):2215-2220
Solvent extraction of microamounts of calcium and strontium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B?) in the presence of dodecaethylene glycol (DDEG, L) has been investigated. The equilibrium data have been explained assuming that the species HL+, H2L2+, ML2+ and MHL3+ (M2+ = Ca2+, Sr2+; L = DDEG) are extracted into the organic phase. The values of extraction and stability constants of the complex species in nitrobenzene saturated with water have been determined. It was found that in this nitrobenzene medium, the stability constant of the SrL2+ complex is somewhat higher than that of CaL2+. 相似文献
20.
M. Daňková E. Makrlík P. Vaňura 《Journal of Radioanalytical and Nuclear Chemistry》2000,245(2):425-426
From several strontium distribution experiments with 85Sr tracer, the extraction constant corresponding to the equilibrium Ca2+(aq)+SrL2+(nb) CaL2+(nb)+Sr2+ (aq) in the two-phase water-nitrobenzene system (L = 18-crown-6; aq = aqueous phase, nb = nitrobenzene phase) was tentatively evaluated as log K
ex (Ca2+,SrL2+) = –1.9±0.1. Furthermore, the stability constant of the calcium — 18-crown-6 complex in nitrobenzene saturated with water was calculated for a temperature of 25 °C: log nb(Cal2+) = 10.1±0.1. 相似文献