Antimony isotopes

Antimony [7440-36-0J, Sb, belongs to Group 15 (VA) of the periodic table which also includes the elements arsenic and bismuth. It is in the second long period of the table between tin and tellurium. Antimony, which may exhibit a valence of +5, +3, 0, or —3 (see Antimony compounds), is classified as a nonmetal or metalloid, although it has metallic characteristics in the trivalent state. There are two stable antimony isotopes that ate both abundant and have masses of 121 (57.25%) and 123 (42.75%). 

An isotope effect seen in Sb03 by Maddock and Sutin was studied by Hall and Sutin , whose results are shown in Table 3. Again, phenyl radicals were cited as the likely means of reforming the bonds. It was pointed out that owing to the occurrence of isomeric transitions in both of these antimony isotopes, differences in the conversion coefficients could lead to the isotopic differences. 

Short-lived antimony Isotopes, such as 19-mlnute Sb12 , 10.3-mlnute Sb12 , and 1.9-minute Sb1 2 produced In Te(d,a) and Te(n,p) reactions or In the fission process, can be separated rapidly as stibine (1,87,88). More recently, 10-second separations of the antimony activities In fission products have been made (l64). For this method Sb+ carrier with the fission products and 300 sulfuric acid was dropped onto metallic zinc held In a distillation flask at 100° C. 

Antimony, isotope of mass 124 Antimony, isotope of mass 129 Argon... 

The couplets have ratios of about 57/43 that correspond to the natural abundance of antimony isotopes (Table 13.7) consistent with the presence of one antimony atom. Spectra at higher masses were found that corresponded to the presence of 2, 3, and 4 antimony atoms within fragments that corresponded to approximately dimers, trimers, and tetramer-containing fragments (Table 13.8). In each case the agreement was reasonable and consistent with the number of antimony atoms assigned to the proposed structure. 

Magnetic moments of antimony isotopes and other nuclei. Phys. Rev. 182(4) (1969) 1357-1358. 

Antimony In the direct y-measurement of the samples, the four strongest peaks of Sb could be observed and used for determination of the concentration. Chemical separation was also successfidly performed as follows. 2 ml of the sample solution was converted from nitrate to chloride medium by repeated evaporations with concentrated hydrochloric acid. After dissolution in 3 M HCl, antimony can be extracted into pure chloroform (or another organic solvent). It can then be back-extracted into 0.1 M HCl. The extraction step is not quantitative, and three to four extractions with fresh solvent are required to obtain an acceptable yield. The back-extraction step is quantitative. The y-spectrometric investigation showed that neither the organic nor the final aqueous phase contained anything but antimony isotopes. 

Rouxel, O., Ludden, J., and Fouquet, Y. (2003) Antimony isotope variations in natural systems and implications for their use as geochemical tracers. Chem. Geol, 200, 25. ... 

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